Loading...
316 free evidence-based calculators across 23 medical specialties
Categories
Tags
Calculate your Body Mass Index (BMI) instantly using height and weight. Free, WHO-validated formula with personalized health category insights for adults.
Calculate ideal body weight (IBW) using Devine, Robinson, Miller, and Hamwi formulas. Find a practical healthy weight range by height and sex.
Calculate body fat percentage with the U.S. Navy method using waist, neck, height, and hip measurements to estimate body composition category.
Calculate your waist-to-hip ratio (WHR) to assess cardiovascular disease risk. A simple measurement used by the WHO as a health indicator.
Calculate your waist-to-height ratio (WHtR) to screen for cardiometabolic risk. A simple metric where keeping your waist under half your height is often recommended.
Calculate body surface area (BSA) with Du Bois, Mosteller, and Haycock formulas for chemotherapy dosing, cardiac index, and clinical calculations.
Calculate basal metabolic rate (BMR) with the Mifflin-St Jeor equation to estimate calories burned at rest, then convert to daily needs with activity.
Calculate TDEE, maintenance calories, and BMR with the Mifflin-St Jeor equation to set calorie targets for fat loss, maintenance, or lean gain.
Calculate your daily macronutrient needs for protein, carbs, and fat. Free macro calculator with customizable splits for cutting, bulking, or maintenance goals.
Calculate recommended daily water intake based on body weight and activity level, with hydration targets in liters and cups.
Calculate your daily calorie needs based on the Mifflin-St Jeor equation. Get personalized BMR, TDEE, and target calories for weight loss, maintenance, or gain.
Track pregnancy weight gain against IOM guidelines. Calculates recommended total gain based on pre-pregnancy BMI and current gestational age.
Calculate BMI-for-age percentile for children and teens (ages 2–20). Based on CDC growth chart data for weight classification.
Look up glycemic index values for common foods to help manage blood sugar and diet planning.
Calculate recommended daily protein intake based on body weight, activity level, and fitness goals.
Screen adults for malnutrition risk using BMI, unplanned weight loss, and acute disease effect with the MUST score.
Calculate eGFR with the CKD-EPI 2021 race-free formula to estimate kidney function and CKD stage from serum creatinine, age, and sex.
Calculate creatinine clearance (CrCl) with Cockcroft-Gault to guide renal medication dose adjustments from age, weight, sex, and serum creatinine.
Calculate corrected QT interval using Bazett, Fridericia, and Framingham formulas. Assess QT prolongation risk from ECG measurements.
Estimate blood alcohol concentration (BAC) from standard drinks, body weight, sex, and time since drinking started using a Widmark-style model. Screen for alcohol use disorder with [AUDIT](/tools/audit) or [CAGE Questionnaire](/tools/cage).
Calculate the MELD and MELD-Na scores to assess liver disease severity and transplant priority. Uses bilirubin, INR, creatinine, and sodium.
Calculate the Child-Pugh score to classify the severity of chronic liver disease and estimate prognosis. Uses bilirubin, albumin, INR, ascites, and encephalopathy.
Calculate anion gap and albumin-corrected anion gap to evaluate metabolic acidosis, narrow differential diagnosis, and monitor treatment response.
Calculate the alveolar-arterial oxygen gradient to evaluate the cause of hypoxemia. Differentiates lung pathology from hypoventilation.
Calculate corrected calcium adjusted for albumin levels. Essential for accurate interpretation of total calcium in hypoalbuminemic patients.
Interpret arterial blood gas (ABG) results to identify acid-base disorders. Determines primary disorder and compensation status from pH, pCO₂, and HCO₃⁻.
Estimate PaO₂ from SpO₂ pulse oximetry using the oxygen-hemoglobin dissociation curve. SpO₂ 98%≈100 mmHg, 95%≈80, 90%≈60 (critical threshold). Useful when ABG is unavailable.
Convert laboratory values between conventional (US) and SI (international) units for 20+ common tests including creatinine, glucose, cholesterol, hemoglobin, electrolytes, and thyroid function.
Calculate corrected sodium for hyperglycemia using the Katz formula to estimate true sodium status in DKA, HHS, and severe stress hyperglycemia.
Calculate Mean Arterial Pressure (MAP = DBP + ⅓ × pulse pressure). Normal MAP: 70–100 mmHg. Sepsis target: MAP ≥65 mmHg. MAP <60 mmHg indicates inadequate organ perfusion requiring immediate intervention.
Calculate expected pCO₂ for respiratory compensation in metabolic acidosis using Winter's formula: expected pCO₂ = 1.5 × [HCO₃] + 8 ± 2. Compare to actual pCO₂ to identify concurrent respiratory disorders.
Calculate serum osmolality from sodium, glucose, and BUN. Normal range: 275–295 mOsm/kg. Osmolal gap >10 suggests toxic alcohol ingestion (methanol, ethylene glycol, isopropanol) or other unmeasured osmoles.
Calculate adjusted body weight (AdjBW) for drug dosing in obese patients: AdjBW = IBW + 0.4 × (TBW − IBW). Used for aminoglycosides, vancomycin, and other weight-based medications when actual weight exceeds IBW by >20%.
Calculate corrected sodium in hyperglycemia using the Katz formula: add 1.6 mEq/L per 100 mg/dL glucose above normal. Essential in DKA to reveal true sodium status hidden by osmotic dilution from hyperglycemia.
Calculate the transtubular potassium gradient (TTKG) to evaluate renal potassium handling. TTKG >7–8 in hypokalemia suggests urinary potassium wasting; TTKG <5 in hyperkalemia indicates renal tubular dysfunction or hypoaldosteronism.
Estimate comorbidity burden with the Charlson Comorbidity Index to support prognosis and risk-adjusted planning.
Estimate calories burned from exercise using activity MET values, body weight, and duration. Useful for fitness planning and weight-management tracking. Combine with [TDEE Calculator](/tools/tdee-calculator) for full energy balance.
Estimate ideal bedtimes or wake times based on 90-minute sleep cycles and sleep latency. Helps plan schedules around 7-9 hours of sleep. Poor sleep affects calorie balance — track with [TDEE Calculator](/tools/tdee-calculator).
Calculate your estimated one-rep max using Epley, Brzycki, and Lander formulas. Determine your maximum strength from submaximal lifts. Pair with [Heart Rate Zones Calculator](/tools/heart-rate-zones) and [VO2 Max Estimator](/tools/vo2-max-calculator) for complete fitness profiling.
Calculate your personal heart rate training zones using the Karvonen method. Optimize your cardio training with zones based on age and resting heart rate. Estimate aerobic capacity with [VO2 Max Estimator](/tools/vo2-max-calculator).
Estimate your VO2 max from resting heart rate using the Uth method. Assess your cardiorespiratory fitness level and aerobic capacity. Higher VO2 max correlates with lower cardiovascular risk — see [ASCVD Risk Calculator](/tools/ascvd-risk).
Calculate the CHA₂DS₂-VASc score to estimate stroke risk in patients with atrial fibrillation and guide anticoagulation therapy decisions.
Calculate the HAS-BLED score to assess bleeding risk in patients on anticoagulation therapy. Balance stroke prevention against bleeding risk.
Calculate 10-year cardiovascular disease risk with the Framingham Risk Score using age, cholesterol, blood pressure, smoking, and diabetes inputs.
Calculate the HEART Score to assess the risk of major adverse cardiac events (MACE) in patients presenting with chest pain.
Classify blood pressure readings into Normal, Elevated, Stage 1, Stage 2, or Hypertensive Crisis using ACC/AHA thresholds. Includes MAP and pulse pressure.
Estimate your heart age from major cardiovascular risk factors using ASCVD-based risk modeling. Compare vascular age with chronological age.
Enter total cholesterol, HDL, and triglycerides to calculate LDL-C via the Friedewald equation. Also calculates non-HDL and cholesterol ratios. Free, instant.
Calculate total cholesterol/HDL ratio and triglyceride/HDL ratio from a standard lipid panel. A total/HDL ratio below 3.5 is optimal. For full cardiovascular risk assessment, use [ASCVD Risk Calculator](/tools/ascvd-risk) or [Framingham Risk Score](/tools/framingham-risk).
Classify heart failure severity using the New York Heart Association (NYHA) functional classification system. Classes I–IV based on physical activity limitations.
Calculate 10-year ASCVD risk using current 2026 ACC/AHA Pooled Cohort Equations. Statin thresholds: <5% low, 5–7.5% borderline, ≥7.5% intermediate, ≥20% high.
Calculate the Duke Treadmill Score for cardiac risk stratification from exercise stress testing. Uses exercise time, ST deviation, and angina symptoms.
Calculate the TIMI risk score for STEMI to predict 30-day mortality.
Calculate the TIMI risk score for NSTEMI and unstable angina to predict 14-day adverse cardiac events.
Calculate the GRACE score for in-hospital mortality risk in acute coronary syndrome patients.
Calculate the Triglyceride-Glucose (TyG) Index from fasting triglycerides and fasting glucose to assess insulin resistance patterns.
Calculate the Atherogenic Index of Plasma using triglycerides and HDL cholesterol to estimate atherogenic lipid risk.
Estimate annual stroke risk in atrial fibrillation with the classic CHADS2 score (0-6) using five bedside factors.
Calculate ABI from ankle and brachial systolic pressures to support peripheral artery disease screening.
Calculate Wells DVT pretest probability in seconds. Score 10 clinical criteria for low, moderate, or high DVT risk — with D-dimer and ultrasound next steps.
Calculate Wells Score for PE to estimate pretest probability and guide D-dimer testing versus direct CTPA for pulmonary embolism workup.
Calculate the Revised Geneva Score using objective criteria to estimate pulmonary embolism pretest probability.
Apply the YEARS algorithm with D-dimer to determine whether pulmonary embolism can be ruled out without CTPA.
Calculate age-adjusted D-dimer cutoffs to improve specificity in PE/DVT rule-out pathways for older adults.
Calculate sPESI to estimate 30-day mortality risk in confirmed pulmonary embolism and support disposition decisions.
Calculate full PESI to classify 30-day mortality risk in confirmed pulmonary embolism (Class I-V).
Evaluate HESTIA exclusion criteria to support outpatient versus inpatient treatment decisions in confirmed PE.
Calculate CRB-65 for community-acquired pneumonia severity when lab data is unavailable.
Calculate CURB-65 for community-acquired pneumonia severity to guide outpatient treatment, hospital admission, or ICU-level evaluation.
Calculate PSI (Pneumonia Severity Index) to classify CAP mortality risk (Class I-V) and guide outpatient treatment, observation, or hospital admission.
Calculate the Glasgow Coma Scale score to assess level of consciousness. Used worldwide in emergency medicine and trauma assessment.
Calculate the APACHE II score to predict ICU mortality risk. Uses acute physiological variables, age, and chronic health status.
Use PERC (Pulmonary Embolism Rule-out Criteria) to rule out PE in low-risk patients without D-dimer or CT when all 8 criteria are negative.
Calculate NEWS2 from vital signs and mental status to detect acute clinical deterioration and guide escalation urgency.
Calculate the Shock Index (HR/SBP ratio) for rapid hemodynamic assessment. Normal: 0.5–0.7. Score ≥1.0 indicates hemodynamic compromise; ≥1.4 indicates severe shock requiring immediate intervention.
Calculate qSOFA bedside sepsis risk score. A score of 2 or more (altered mentation, RR ≥22, SBP ≤100) flags high-risk infection requiring urgent evaluation.
Calculate the SOFA score to assess organ dysfunction severity in critically ill patients. Scores range from 0 to 24 across six organ systems.
Evaluate SIRS criteria for systemic inflammatory response. Two or more criteria (temperature, HR, RR, WBC) indicates SIRS. Note: Sepsis-3 definitions now prefer qSOFA and SOFA scoring.
Calculate IV fluid requirements for burn patients using the Parkland formula: 4 mL × kg × % TBSA in 24 hours. Half given in first 8 hours from injury, half over next 16 hours.
Calculate the Revised Trauma Score (RTS) for trauma triage and survival prediction. Combines GCS, systolic BP, and respiratory rate. Maximum score 7.84; RTS <4 predicts high mortality.
Calculate Alvarado score to estimate appendicitis likelihood from symptoms, signs, and basic lab findings.
Calculate LRINEC from routine labs to estimate risk of necrotizing soft tissue infection.
Calculate qCSI to estimate short-term risk of critical respiratory illness using respiratory rate, SpO2, and oxygen flow.
Apply CHESS criteria to estimate short-term serious outcome risk after syncope.
Apply the Canadian CT Head Rule to determine if CT is needed after minor head injury (GCS 13–15). Achieves 98.4% sensitivity for neurosurgically significant injuries, safely reducing CT use.
Apply the NEXUS criteria to determine if cervical spine imaging is needed after trauma. All 5 criteria absent gives 99.8% NPV for significant C-spine injury, safely avoiding CT or X-ray.
Classify ED triage acuity using Emergency Severity Index levels 1-5 based on life threat, high-risk features, and expected resource needs.
Screen ICU patients for delirium using the CAM-ICU algorithm (acute/fluctuating change, inattention, consciousness, disorganized thinking).
Classify bedside agitation or sedation from +4 (combative) to -5 (unarousable) using the Richmond Agitation-Sedation Scale.
Estimate pain behavior in non-verbal or critically ill adults using CPOT domains (facial expression, body movement, muscle tension, and ventilator/vocalization).
Calculate your estimated due date (EDD) from your last menstrual period using Naegele's rule. Track gestational age and trimester.
Predict your next period date using your last menstrual period and average cycle length. See cycle day, fertile window, and upcoming period dates.
Estimate your ovulation date and fertile window using cycle length and last period date. See best days to conceive and estimated due date if conception occurs.
Estimate your conception date from your last menstrual period and cycle length, or from your estimated due date. Includes likely conception window and ovulation estimate.
Calculate the Bishop Score to assess cervical favorability for labor induction. Predicts likelihood of successful vaginal delivery.
Calculate the Apgar Score to quickly assess newborn health at 1 and 5 minutes after birth. Evaluates appearance, pulse, grimace, activity, and respiration.
Calculate gestational age in weeks and days from last menstrual period (LMP). Get trimester, estimated due date (EDD), and days remaining.
Enter BPD, HC, AC, and FL ultrasound values to get estimated fetal weight (EFW) using the Hadlock formula. Includes percentile and SGA/AGA/LGA classification. Free, instant.
Time contractions during labor to track duration, frequency, and pattern for the 5-1-1 rule.
Live timer for Apgar scoring at 1 and 5 minutes after birth with real-time assessment.
Calculate IV infusion rates in mL/hr and drops per minute from volume, time, and drop factor. Essential nursing and pharmacy calculator for safe, accurate IV fluid and medication administration.
Calculate morphine milligram equivalents (MME) for opioid medications using CDC conversion factors. ≥50 MME/day warrants caution; ≥90 MME/day carries significantly increased overdose risk.
Calculate pediatric medication doses based on patient weight (mg/kg). Essential for safe pediatric prescribing.
Get warfarin dose adjustment guidance based on current INR and target range. Helps manage anticoagulation therapy.
Calculate gentamicin dose and interval using extended-interval (5–7 mg/kg q24h) or traditional q8–12h dosing methods based on creatinine clearance and adjusted body weight.
Get renal dosing guidance by eGFR stage for antibiotics, anticoagulants, metformin, NSAIDs, and 20+ drug classes using CKD staging.
Classify opioid-related sedation severity (S, 1, 2, 3, 4) and map to common bedside action guidance.
Classify sedation depth from 1 to 6 using the Ramsay Sedation Scale to support bedside sedation monitoring.
Convert HbA1c to estimated average glucose (eAG): 6%=126 mg/dL, 7%=154, 8%=183, 9%=212. ADA 2026 target <7% for most adults with diabetes. Shows both mg/dL and mmol/L.
Calculate insulin correction factor (ISF) using the 1800 rule (rapid-acting) or 1500 rule (regular insulin). Enter total daily dose — see how much 1 unit lowers blood glucose.
Interpret TSH and free T4 to assess thyroid function. Normal TSH: 0.4–4.0 mIU/L. Identifies overt and subclinical hypothyroidism, hyperthyroidism, and euthyroid sick syndrome.
Estimate the starting levothyroxine dose for hypothyroidism: ~1.6 mcg/kg/day for full replacement, ~25–50 mcg/day for subclinical hypothyroidism. Recheck TSH at 6–8 weeks.
Convert between corticosteroid doses by anti-inflammatory potency equivalence: prednisone 5 mg = hydrocortisone 20 mg = methylprednisolone 4 mg = dexamethasone 0.75 mg.
Estimate insulin resistance using fasting glucose and fasting insulin with the HOMA-IR equation.
Estimate insulin sensitivity using fasting glucose and fasting insulin with the QUICKI formula.
Estimate beta-cell function using fasting glucose and fasting insulin with the HOMA-Beta equation.
Calculate the NIH Stroke Scale (NIHSS) to quantify stroke severity. Mild ≤4, Moderate 5–15, Severe 16–20, Very Severe >20. Guides IV tPA eligibility and acute stroke unit treatment decisions.
Calculate the ABCD² score to estimate stroke risk after TIA. Score 6–7: 8.1% two-day risk. Score 4–5: 4.1%. Score 0–3: 1.0%. Guides inpatient admission vs expedited outpatient workup.
Classify subarachnoid hemorrhage severity using the Hunt & Hess scale to predict surgical outcomes.
Classify subarachnoid hemorrhage on CT using the Fisher grading scale to predict vasospasm risk.
Free PHQ-9 depression screening questionnaire. Take the Patient Health Questionnaire-9 to assess depression severity with instant scoring and interpretation. Also screen for anxiety with [GAD-7](/tools/gad7).
Free GAD-7 anxiety screening questionnaire. Take the Generalized Anxiety Disorder 7-item scale to assess anxiety severity with instant scoring and interpretation. Also screen for depression with [PHQ-9](/tools/phq9).
Quick two-question depression screen using the PHQ-2. A score of 3 or higher suggests further evaluation with the full [PHQ-9](/tools/phq9).
Quick two-question anxiety screen using the GAD-2. A score of 3 or higher suggests further evaluation with the full [GAD-7](/tools/gad7).
Screen for hazardous and harmful alcohol use with the 10-question AUDIT. Scores range from 0 to 40 across four risk zones. For quick screening use [CAGE](/tools/cage).
Quick four-question alcohol screening using the CAGE questionnaire. A score of 2 or more suggests possible alcohol problems. For comprehensive screening, use [AUDIT](/tools/audit).
Rapid 3-question alcohol-use screen to identify hazardous drinking patterns.
Screen for problematic alcohol or drug use with the 4-item CAGE-AID questionnaire.
Screen non-alcohol drug-use problems using the 10-item Drug Abuse Screening Test (DAST-10).
Screen for adult ADHD symptoms using the 6-item ASRS v1.1 Part A screener.
Estimate nicotine dependence severity with the 6-item Fagerstrom Test.
Screen suicide-risk signal using the 4-item Suicidal Behaviors Questionnaire-Revised (SBQ-R).
Rate clinician-observed anxiety severity using the 14-item Hamilton Anxiety Rating Scale.
Screen anxiety and depression symptom burden using the 14-item HADS (HADS-A + HADS-D).
Measure perceived stress burden over the past month using the 10-item PSS-10.
Rate manic symptom severity with the clinician-rated 11-item Young Mania Rating Scale.
Screen depressive symptoms in older adults using the 15-item GDS-15 yes/no questionnaire.
Measure non-specific psychological distress over the past 4 weeks using the 10-item K10 scale.
Screen obsessive-compulsive symptom burden using the 18-item OCI-R across six symptom domains.
Rapid 4-item screen combining PHQ-2 and GAD-2 to triage depression and anxiety burden.
Measure recent positive well-being with the 5-item WHO-5 index and percentage score.
Screen serious psychological distress using the 6-item K6 scale.
Screen perceived social loneliness with the brief 3-item UCLA loneliness scale.
Screen for postnatal depression using the Edinburgh Postnatal Depression Scale. Scores of 10 or higher suggest possible depression.
Screen for PTSD using the PCL-5 checklist. Score ranges from 0 to 80; a score of 31-33 or higher suggests probable PTSD.
Screen for suicidal ideation and behavior using the Columbia Suicide Severity Rating Scale screener version. Assesses risk level based on ideation severity.
Interpret Montreal Cognitive Assessment (MoCA) scores. The leading cognitive screening tool for mild cognitive impairment and dementia.
Screen for depression using the WHO-endorsed Major Depression Inventory (MDI). A 10-item self-report questionnaire scoring 0–50.
Interpret Mini-Mental State Examination (MMSE) scores. The classic cognitive screening test for dementia, scoring 0–30.
Interpret Beck Depression Inventory-II (BDI-II) total scores. One of the most widely cited depression severity measures, scoring 0–63.
Estimate alcohol withdrawal severity with the Clinical Institute Withdrawal Assessment for Alcohol, revised (CIWA-Ar).
Estimate opioid withdrawal severity using the Clinical Opiate Withdrawal Scale (COWS).
Screen for bipolar-spectrum symptom patterns using the Mood Disorder Questionnaire (MDQ) criteria framework.
Assess insomnia burden with the 7-item Insomnia Severity Index (ISI) and classify symptom severity.
Screen risk of opioid misuse with the Opioid Risk Tool before initiating long-term opioid therapy.
Calculate the Psoriasis Area and Severity Index (PASI) to assess psoriasis severity across four body regions. Scores range from 0 to 72. Pair with [DLQI Score](/tools/dlqi) for biologic eligibility assessment.
Estimate total body surface area (TBSA) affected by burns using the Rule of Nines. Enter affected areas to calculate total burn percentage. Then use TBSA result in [Parkland Formula](/tools/parkland-formula) for fluid resuscitation.
Calculate the Dermatology Life Quality Index (DLQI) to measure skin disease impact on quality of life. Score >10 indicates very large effect and is the NICE threshold for biologic therapy eligibility.
Screen a mole against the ABCDE melanoma warning signs: Asymmetry, Border irregularity, Color variation, Diameter >6mm, and Evolving changes. Any positive sign warrants urgent dermatology evaluation.
Estimate total body surface area (TBSA) burned using the Rule of Nines. Head=9%, each arm=9%, each leg=18%, torso=36%. Burns ≥20% TBSA require IV fluid resuscitation with the Parkland formula.
Assess independence in six basic activities of daily living with the Katz ADL Index. Scores range from 0 (dependent) to 6 (fully independent).
Assess inpatient fall risk with the Morse Fall Scale. Scores categorize patients as low, moderate, or high risk to guide fall-prevention protocols.
Assess frailty using the Rockwood Clinical Frailty Scale (CFS 1–9): Very Fit to Terminally Ill. Used for ICU triage, surgical risk stratification, and goals-of-care discussions in elderly patients.
Screen for delirium using the CAM (Confusion Assessment Method). Gold standard with ~94% sensitivity and ~89% specificity. Requires acute onset + inattention, plus disorganized thinking or altered consciousness.
Assess mobility and fall risk with the Timed Up and Go (TUG) test. TUG >12 seconds indicates high fall risk. Times the performance of standing, walking 3 meters, turning, and returning to seated.
Assess independence in core activities of daily living with the Barthel Index (0-100), commonly used in rehabilitation and geriatric care.
Estimate pressure injury risk with the Norton Scale using physical condition, mental state, activity, mobility, and incontinence.
Estimate pressure injury risk using the Braden Scale (6-23) across sensory perception, moisture, activity, mobility, nutrition, and friction/shear.
Screen for probable sarcopenia risk using SARC-F (0-10) across strength, walking, chair rise, stair climbing, and falls.
Screen for possible cognitive impairment using delayed 3-word recall plus clock drawing (score 0-5).
Estimate pressure ulcer risk using the Waterlow framework with risk domains such as skin status, mobility, continence, nutrition, and age.
Screen malnutrition risk in older adults with the MNA-SF 6-item tool (score 0-14).
Assess independence in higher-level daily tasks using the Lawton IADL scale (score 0-8).
Screen frailty using the 5-item FRAIL scale (Fatigue, Resistance, Ambulation, Illnesses, Loss of weight).
Screen frailty with the 7-item PRISMA-7 questionnaire (score 0-7; >=3 suggests frailty risk).
Estimate lower-extremity functional performance with SPPB total score (0-12) from balance, gait speed, and chair stands.
Screen multidomain frailty using the Edmonton Frailty Scale (EFS), a 0-17 style structured assessment.
Screen vulnerability in adults aged 65+ with VES-13; scores >=3 indicate elevated risk of functional decline.
Classify robust, pre-frail, and frail states using the 5-criterion Fried frailty phenotype.
Rapid emergency/acute-care screening for older-adult risk using the 6-item ISAR tool (score 0-6).
Classify hospital frailty risk category from HFRS value (<5 low, 5-15 intermediate, >15 high).
Screen older surgical/inpatient adults for postoperative delirium risk using the DEAR 4-item score.
Classify eFI values into fit, mild, moderate, or severe frailty categories using common thresholds.
Screen multidomain frailty with the 15-item GFI; scores >=4 are commonly considered frailty-positive.
Screen multidomain frailty with the 15-item TFI across physical, psychological, and social domains.
Enhance SARC-F screening by incorporating calf-circumference risk points to improve sarcopenia detection.
Calculate deficit-accumulation frailty index from 40 predefined deficits (score 0 to 1).
Screen older adults for vulnerability using the G8 tool (score 0-17), often used in geriatric oncology.
Calculate usual gait speed over 4 meters (m/s), a key functional vital sign in older adults.
Assess lower-extremity functional strength and mobility by timing 5 repeated chair stands.
Calculate full MNA score (0-30) to classify normal nutrition, risk of malnutrition, or malnutrition in older adults.
Assess concern about falling with the 7-item Short FES-I score (7-28).
Classify SLUMS cognitive-screen totals (0-30) to support triage for fuller neurocognitive evaluation.
Estimate inpatient/older-adult fall risk using the Downton index (score 0-11; >=3 commonly high risk).
Assess observational pain behaviors in advanced dementia using the 5-item PAINAD scale (0-10).
Screen pain in people with severe dementia using the 6-domain Abbey Pain Scale (0-18).
Estimate depressive symptom burden in dementia using the Cornell Scale for Depression in Dementia (0-38).
Classify functional dementia progression using FAST stages 1 through 7f.
Screen cognitive status with the 15-point Brief Interview for Mental Status (BIMS) used in long-term and post-acute care.
Assess observational pain burden in cognitively impaired older adults with the DoloPlus-2 (0-30).
Assess pain behaviors in cognitively impaired older adults using the 15-item PAIC-15 observational scale (0-45).
Classify dementia severity with the Clinical Dementia Rating global stage (0, 0.5, 1, 2, 3).
Stage overall cognitive decline with the 7-level Global Deterioration Scale (GDS) from no decline to very severe dementia.
Estimate informant-reported cognitive decline using the short 16-item IQCODE mean score.
Screen for cognitive impairment using the 8-item AD8 informant interview (score 0-8).
Rapid cognitive screening with the Six-Item Cognitive Impairment Test (6CIT), weighted score range 0-28.
Screen memory impairment with the brief delayed free- and cued-recall Memory Impairment Screen (0-8).
Rapid delirium screening tool scored 0-12; scores of 4 or more suggest possible delirium.
Assess instrumental daily-function impairment with the 10-item Pfeffer FAQ (0-30).
Brief weighted orientation-memory-concentration cognitive screen scored 0-28.
Informant-rated everyday cognition decline scale summarized by mean score across 12 items.
10-item bedside cognitive screen for rapid cognitive impairment triage in older adults.
Pfeiffer cognitive screen interpreted by error count (0-10) for older-adult cognitive impairment triage.
Rapid bedside cognitive screen assessing visuospatial and executive function through a structured clock drawing task.
A brief 5-item nursing delirium screen (0-10) commonly using >=2 as a positive threshold.
A 10-domain delirium severity scale (0-30) commonly using cutoff around >=13 for delirium signal.
Primary-care cognitive screen using a 9-point patient section with optional informant follow-up.
Brief 10-point cognitive screen used to triage likely normal cognition, MCI signal, or dementia-range impairment.
A 25-item multidomain frailty-risk questionnaire used to identify older adults at risk of functional decline.
A nursing-home focused frailty measure summarizing dependency, mobility, nutrition, and functional vulnerability.
A 3-item frailty phenotype screen classifying robust, prefrail, or frail status.
A 4-item appetite screen (4-20) used to identify older adults at risk for short-term weight loss.
A structured gait-and-balance assessment (0-28) used to estimate fall risk in older adults.
A 14-task balance assessment scored 0-56 to quantify postural control and fall-risk signal.
A quick standing balance test measuring maximal forward reach distance to estimate fall-risk signal.
Counts sit-to-stand repetitions completed in 30 seconds to assess lower-body functional strength.
A nursing observation-based delirium screen scored 0-13, with >=3 commonly treated as positive.
A 2-item ultra-brief delirium screen where any failed item suggests possible delirium.
Summed anticholinergic medication burden score used to estimate cognitive and functional adverse-effect risk.
A 5-item inpatient fall-risk tool (0-5) with >=2 commonly used as high-risk threshold.
An inpatient fall-risk score with common high-risk threshold at 5 or more points.
A quick static-balance test using unsupported one-leg standing time to estimate fall-risk signal.
A point-based inpatient fall-risk assessment with low/moderate/high risk bands.
A nurse-observed 0-30 confusion scale for early detection of cognitive fluctuation and delirium signal.
A 30-point cognitive screen designed for culturally and linguistically diverse populations.
A brief 30-point cognitive screen used to detect mild cognitive impairment and dementia signal.
A rapid positive/negative delirium screen adapted from CAM logic for acute-care workflows.
A structured delirium severity instrument with higher scores reflecting greater symptom burden.
A nutrition-related risk index used in older adults to stratify adverse-outcome risk.
A lab-based nutrition screening score (0-12) combining albumin, cholesterol, and lymphocyte components.
A brief caregiver-burden questionnaire used to quantify strain in dementia and chronic-care contexts.
A 13-item yes/no caregiver-strain screen where >=7 often indicates clinically significant strain.
A 5-item late-life depression screen with higher scores indicating greater depressive symptom signal.
A nutrition-risk index where lower scores indicate increasing malnutrition-associated risk.
A brief malnutrition screen (0-5) based on unintentional weight loss and appetite reduction.
A guideline-based hospital nutrition risk score where >=3 suggests need for nutrition support.
A 10-item dysphagia symptom screen (0-40) where >=3 commonly indicates swallowing-risk signal.
A bedside mobility function score (0-20) used to estimate dependence and rehabilitation needs.
An ultra-brief positive/negative delirium triage screen used before fuller confirmatory assessment.
A point-based delirium risk model used to estimate incident delirium risk in hospitalized adults.
A delirium severity scale derived from CAM features, used for symptom burden tracking over time.
A 26-item informant-based cognitive decline screen summarized as a 1.0-5.0 mean score.
A brief informant-rated cognitive-functional staging scale used to estimate dementia severity burden.
A caregiver-observed cognitive-functional impairment scale used for dementia severity estimation.
A brief caregiver/informant questionnaire for behavioral and psychological symptoms in dementia, reporting severity and caregiver distress totals.
An informant-based functional scale used to quantify daily living ability in patients with Alzheimer disease and related cognitive disorders.
Assess level of consciousness in infants and young children using the Pediatric Glasgow Coma Scale. Scores range from 3 to 15.
Estimate pediatric weight by age using APLS formulas (ages 1–5: 2×age+8 kg; ages 6–14: 3×age+7 kg). Critical for emergency drug dosing and equipment sizing when a scale is unavailable.
Assess neonatal jaundice severity using the Bhutani nomogram. Plots total serum bilirubin against age in hours to determine risk zone (low, low-intermediate, high-intermediate, high) and guide phototherapy decisions.
Calculate the Modified Centor (McIsaac) Score for streptococcal pharyngitis probability. Score 0–1: no testing needed. Score 2–3: rapid strep test. Score 4–5: treat empirically with antibiotics.
Estimate vancomycin AUC/MIC from dose, interval, trough level, and weight. Target AUC/MIC 400–600 for MRSA per 2020 ASHP/IDSA/SIDP guidelines. Adjust dose for renal impairment.
Convert nasal cannula L/min to FiO2% instantly. Full reference chart for 1–6 L/min, face mask, non-rebreather, and HFNC. Includes P/F ratio and A-a gradient inputs.
Calculate the P/F ratio to classify ARDS severity by Berlin criteria. Mild: 200–300 (27% mortality). Moderate: 100–200 (32%). Severe: <100 (45%). Normal P/F is 400–500.
Estimate oxygen cylinder duration by tank size, PSI, and flow rate (L/min). Includes D, E, G, H/K, and M tanks for EMS transport, inpatient transfer, and home oxygen planning.
Screen for obstructive sleep apnea risk using the validated STOP-BANG questionnaire (0-8 points).
Calculate pack-years from cigarettes per day and years smoked. Useful for documenting smoking burden and lung cancer screening discussions.
Calculate the Asthma Control Test score to assess asthma control over the past 4 weeks.
Classify COPD severity using 2024 GOLD spirometric stages (GOLD 1–4) and ABE exacerbation grouping. Guides inhaler step-up therapy, pulmonary rehabilitation, and oxygen therapy decisions.
Grade baseline breathlessness from 0 to 4 with the modified Medical Research Council (mMRC) dyspnea scale.
Estimate COPD mortality risk with the BODE index using BMI, airflow obstruction, dyspnea grade, and 6-minute walk distance.
Calculate the Fractional Excretion of Sodium (FENa) to differentiate pre-renal azotemia (FENa <1%) from intrinsic renal disease such as ATN (FENa >2%) in acute kidney injury.
Calculate the BUN/Creatinine ratio to distinguish pre-renal from intrinsic acute kidney injury. Normal ratio 10–20. Ratio >20 suggests pre-renal azotemia; <10 suggests intrinsic renal disease.
Calculate free water deficit for hypernatremia using TBW × (serum Na/140 - 1), with practical 24-hour sodium correction targets and fluid-planning guidance.
Calculate the urine anion gap to differentiate GI from renal causes of non-anion gap metabolic acidosis. Negative UAG suggests GI bicarbonate loss; positive UAG suggests renal tubular acidosis.
Calculate measured creatinine clearance from a 24-hour urine collection. More accurate than estimated GFR in certain populations.
Calculate FEUrea to help distinguish pre-renal azotemia from intrinsic AKI, especially when diuretics make FENa unreliable.
Calculate osmolar gap to screen for unmeasured osmoles such as toxic alcohols, ethanol, mannitol, or propylene glycol.
Use the Ottawa Ankle Rules to determine if an ankle X-ray is needed after injury. A validated clinical decision rule with ~98% sensitivity for fractures.
Apply the Ottawa Knee Rules to determine if a knee X-ray is needed after acute knee injury. ~99% sensitivity for clinically significant fractures. Reduces knee X-rays by over 25% when applied correctly.
Estimate 10-year risk of major osteoporotic and hip fracture using the WHO FRAX tool. Treatment threshold: major fracture risk ≥20% or hip fracture risk ≥3% in patients without BMD testing.
Calculate the International Prostate Symptom Score (IPSS/AUA-SI) to assess BPH symptom severity. Mild (0–7): watchful waiting. Moderate (8–19): medications. Severe (20–35): surgical evaluation.
Calculate PSA density (PSAD) to differentiate BPH from prostate cancer. PSAD ≥0.15 ng/mL/mL indicates higher cancer risk and may warrant biopsy even with borderline total PSA levels.
Estimate prostate volume from TRUS or MRI measurements using the ellipsoid formula (π/6 × L × W × H). Normal prostate is 20–30 mL; volume >40 mL suggests clinically significant BPH.
Calculate the IIEF-5 to classify erectile dysfunction severity: Severe (5–7), Moderate (8–11), Mild-Moderate (12–16), Mild (17–21), No ED (22–25). Guides PDE5 inhibitor and referral decisions.
Calculate the STONE score to predict kidney stones in ED patients with flank pain. High score ≥10: 88.6% probability. Moderate 5–9: 51.3%. Low ≤4: 9.2%. Guides CT imaging decisions.
Interpret post-void residual (PVR) volume for urinary retention and BPH evaluation. PVR <50 mL: normal. 50–200 mL: equivocal. >300 mL: significant retention requiring intervention.
Calculate PSA doubling time (PSADT) to monitor prostate cancer progression after treatment. PSADT <3 months: aggressive recurrence. 3–12 months: intermediate. >12 months: lower-risk.
Calculate the UCSF-CAPRA score for prostate cancer risk stratification. Low (0–2), Intermediate (3–5), High (6–10) risk categories guide treatment choice and predict biochemical recurrence.
Calculate the Overactive Bladder Symptom Score (OABSS) to assess OAB severity. Mild (3–5), Moderate (6–11), Severe (≥12) guides anticholinergic or beta-3 agonist therapy selection.
Estimate bladder volume from ultrasound length, width, and height measurements using the ellipsoid formula (0.523 × L × W × H). Essential for urinary retention diagnosis and BPH assessment.
Predict kidney stone recurrence at 2 and 5 years using the validated ROKS nomogram. Enter stone history, composition, and BMI — get risk percentages and prevention guidance.
Calculate EORTC risk scores for non-muscle invasive bladder cancer recurrence and progression. Low, Intermediate, or High risk guides BCG therapy, intravesical chemotherapy, and cystoscopy frequency.
Calculate the Rockall score to predict rebleeding and mortality in upper GI hemorrhage. Pre-endoscopy score ≤2: low risk for rebleeding. Post-endoscopy score 0: <5% rebleeding risk.
Calculate the Glasgow-Blatchford score to identify low-risk upper GI bleed patients. Score 0–1: safe for outpatient endoscopy without admission. Higher scores guide urgency and ICU level of care.
Estimate in-hospital mortality risk in upper GI bleeding using the 5-item AIMS65 score.
Estimate liver fibrosis risk using age, AST, ALT, and platelet count with the FIB-4 index.
Calculate the AST/ALT ratio as an adjunct liver injury pattern marker in hepatology evaluation.
Estimate liver fibrosis risk using AST, AST upper-limit-of-normal, and platelet count with the APRI equation.
Estimate advanced fibrosis risk in fatty liver disease using age, BMI, diabetes status, AST/ALT ratio, platelets, and albumin.
Estimate early severity risk in acute pancreatitis using the BISAP bedside score (0-5) during the first 24 hours.
Classify stool form using the Bristol Stool Scale to support constipation/diarrhea pattern assessment and symptom tracking.
Quantify constipation symptom burden with the Wexner (Cleveland Clinic) constipation scoring system.
Score HIT pretest probability with the validated 4T tool. Score ≤3: >99% NPV — HIT unlikely. Score ≥4: stop heparin and switch anticoagulants. Free clinical calculator.
Calculate the Revised Geneva Score to estimate clinical probability of pulmonary embolism.
Estimate venous thromboembolism risk in hospitalized medical patients using the Padua Prediction Score.
Estimate overt disseminated intravascular coagulation probability using the ISTH scoring framework.
Calculate NLR from absolute neutrophil and lymphocyte counts as an inflammatory and prognostic marker.
Calculate the Mentzer Index (MCV/RBC) to help screen iron deficiency anemia versus thalassemia trait in microcytosis.
Calculate PLR from platelet and absolute lymphocyte counts as an adjunct inflammatory marker.
Classify cancer patient performance status using the ECOG 0–5 scale. ECOG 0–1: eligible for standard chemotherapy. ECOG 2: limited self-care. ECOG 3+: significantly impaired, clinical trial caution.
Classify lymphoma PET response using the Deauville 5-point scale by comparing lesion uptake to mediastinum and liver.
Classify oncology functional status from 100 to 0 using the Karnofsky Performance Status scale for prognosis and treatment planning.
Classify preoperative physical status using the ASA I–VI system for anesthetic risk stratification. ASA III+ indicates significant systemic disease requiring special perioperative planning and precautions.
Estimate perioperative major cardiac event risk for non-cardiac surgery using the 6-factor Lee RCRI model.
Classify airway visibility (Class I-IV) to support difficult-airway risk assessment before anesthesia or airway procedures.
Estimate postoperative venous thromboembolism risk using the Caprini point-based model for surgical patients.