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BMI Calculator
Calculate your Body Mass Index (BMI) instantly using height and weight. Free, WHO-validated formula with personalized health category insights for adults.
Open toolTDEE Calculator
Calculate TDEE, maintenance calories, and BMR with the Mifflin-St Jeor equation to set calorie targets for fat loss, maintenance, or lean gain.
Open toolIdeal Weight
Calculate ideal body weight (IBW) using Devine, Robinson, Miller, and Hamwi formulas. Find a practical healthy weight range by height and sex.
Open toolBody Fat Calculator
Calculate body fat percentage with the U.S. Navy method using waist, neck, height, and hip measurements to estimate body composition category.
Open toolAll Tools
317 free calculators and health tools
BMI Calculator
Calculate your Body Mass Index (BMI) instantly using height and weight. Free, WHO-validated formula with personalized health category insights for adults.
OpenIdeal Weight
Calculate ideal body weight (IBW) using Devine, Robinson, Miller, and Hamwi formulas. Find a practical healthy weight range by height and sex.
OpenBody Fat Calculator
Calculate body fat percentage with the U.S. Navy method using waist, neck, height, and hip measurements to estimate body composition category.
OpenWaist-to-Hip Ratio
Calculate your waist-to-hip ratio (WHR) to assess cardiovascular disease risk. A simple measurement used by the WHO as a health indicator.
OpenWaist-to-Height Ratio
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.
OpenBSA Calculator
Calculate body surface area (BSA) with Du Bois, Mosteller, and Haycock formulas for chemotherapy dosing, cardiac index, and clinical calculations.
OpenBMR Calculator
Calculate basal metabolic rate (BMR) with the Mifflin-St Jeor equation to estimate calories burned at rest, then convert to daily needs with activity.
OpenTDEE Calculator
Calculate TDEE, maintenance calories, and BMR with the Mifflin-St Jeor equation to set calorie targets for fat loss, maintenance, or lean gain.
OpenMacro Calculator
Calculate your daily macronutrient needs for protein, carbs, and fat. Free macro calculator with customizable splits for cutting, bulking, or maintenance goals.
OpenWater Intake
Calculate recommended daily water intake based on body weight and activity level, with hydration targets in liters and cups.
OpenCalorie Calculator
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.
OpenPregnancy Weight Gain
Track pregnancy weight gain against IOM guidelines. Calculates recommended total gain based on pre-pregnancy BMI and current gestational age.
OpenDid You Know?
Your body is about 60% water. Even mild dehydration (1-2%) can impair cognitive performance and mood.
Try Water Intake CalculatorBMI was invented in the 1830s by a mathematician, not a physician. It was never intended as an individual health measure.
Try BMI CalculatorYour resting heart rate is one of the simplest indicators of cardiovascular fitness. Elite athletes can have a resting HR below 40 bpm.
Try Heart Rate ZonesThe kidneys filter about 180 liters of blood every day — that's enough to fill a bathtub twice over.
Try eGFR CalculatorFree Forever
No subscriptions, no paywalls. All tools are completely free to use.
Private & Secure
All calculations happen in your browser. We never store or transmit your health data.
Evidence-Based
Our formulas come from peer-reviewed medical literature with cited sources.