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Printed on 6/29/2026
For informational purposes only. This is not medical advice.
This calculator estimates daily protein requirements based on current evidence-based guidelines. Recommendations range from 0.8 g/kg for sedentary adults to 1.6–2.2 g/kg for athletes and individuals seeking muscle gain. Higher protein during weight loss helps preserve lean mass.
Formula: Sedentary: 0.8–1.0 g/kg. Active: 1.0–1.4 g/kg. Athlete: 1.2–2.0 g/kg. Muscle gain: 1.6–2.2 g/kg. Weight loss: 1.2–1.6 g/kg/day.
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Input your body weight in kilograms and select your activity level: sedentary adult, active adult, or athlete. These two values determine the evidence-based protein range appropriate for you.
Select your goal: general health, muscle gain, or weight loss. Goals modulate protein within the activity-appropriate range — for example, muscle gain requires 1.6–2.2 g/kg/day, while weight loss requires 1.2–1.6 g/kg/day to preserve lean mass during a calorie deficit.
Your result shows the recommended daily protein range in grams. Divide this across 3–5 meals to optimize muscle protein synthesis — each meal should contain 20–40 g of protein to exceed the leucine threshold needed to trigger MPS.
Athletes & strength/endurance coaches
Establish protein targets for training phases. Endurance athletes need 1.4–1.7 g/kg; strength athletes 1.6–2.2 g/kg. Higher intakes during cutting phases (up to 3.1 g/kg) preserve lean mass. Use alongside the [TDEE Calculator](/tools/tdee-calculator) to ensure adequate energy availability.
Older adults (65+) & geriatricians
Age-related muscle loss (sarcopenia) accelerates after 65 and increases falls, disability, and mortality risk. Older adults need 1.0–1.2 g/kg/day — higher than the RDA — and benefit from leucine-rich protein at each meal to overcome anabolic resistance.
Surgical patients & clinical dietitians
After major surgery, trauma, or burns, protein requirements increase to 1.5–2.0 g/kg/day to support wound healing, immune function, and lean mass preservation. Early protein provision (within 24–48h) is associated with better outcomes.
Vegans & vegetarians
Assess whether protein needs are being met on a plant-based diet. Plant proteins are generally lower in leucine and have lower digestibility. Combining diverse plant sources and aiming toward the higher end of the recommended range ensures adequate essential amino acid intake.
Nephrologists & CKD dietitians
Non-dialysis CKD (stages 3–5): protein restriction 0.6–0.8 g/kg/day slows progression. Dialysis patients paradoxically need more: 1.0–1.4 g/kg/day to compensate for dialytic losses. This calculator provides the population-level baseline; individualize for renal patients.
Dieters & weight management programs
Higher protein during calorie restriction (1.2–1.6 g/kg/day, or up to 2.3–3.1 g/kg for lean athletes cutting) preserves muscle while fat is lost. Protein also increases satiety and has a higher thermic effect (~25%) than carbs or fat, further supporting fat loss.
The RDA was designed to prevent deficiency in sedentary adults, not to optimize muscle maintenance, performance, or aging. Most nutrition researchers recommend 1.2–1.6 g/kg for active adults and higher for specific goals.
Muscle protein synthesis (MPS) requires crossing a leucine threshold (~2.5 g leucine per meal). A meal with 20–40 g of high-quality protein typically provides this. Eating all your protein in one meal is less effective than spreading it across 3–5 meals.
Whey protein and most animal proteins are high in leucine (8–11% leucine content) and stimulate MPS more effectively than plant proteins of equal gram weight. This is why protein quality matters, not just quantity.
Anabolic resistance in aging means older adults need a higher leucine dose to stimulate MPS. Aim for 0.4 g/kg body weight per meal — for a 70 kg person, that's ~28 g per meal — rather than the 20–25 g optimal for younger adults.
Spreading protein across meals (rather than front- or back-loading) produces greater 24-hour MPS than an uneven distribution, even when daily totals are identical. Aim for roughly equal protein at breakfast, lunch, and dinner.
Non-dialysis CKD stages 3–5: restrict to 0.6–0.8 g/kg/day to slow progression. Dialysis patients: increase to 1.0–1.4 g/kg/day because dialysis removes amino acids. Applying the wrong target to the wrong group is a serious clinical error.
Multiple meta-analyses, including Kalogeropoulos et al. (Clin J Am Soc Nephrol 2016), found no association between high protein intake and CKD development in people with normal kidney function. The concern applies only to those with pre-existing kidney disease.
Lean athletes in a calorie deficit to reduce weight class may benefit from protein as high as 2.3–3.1 g/kg/day to maximize lean mass retention. This upper range is specific to this high-performance context, not general health.
No single plant food needs to be 'combined with' a complementary food at the same meal — the liver recycles amino acids over 24 hours. Simply eating varied plant protein sources throughout the day provides a complete amino acid profile.
RDA for protein 0.8 g/kg/day established by the DRI panel (Institute of Medicine 2005). Higher intakes for athletes supported by Morton et al. (BJSM 2018) meta-analysis: 1.62 g/kg optimal for muscle hypertrophy. Leucine threshold for MPS from Churchward-Venne et al. (J Physiol 2012). Protein and kidney health: no association with CKD progression in healthy individuals per multiple meta-analyses. CKD protein restriction: KDIGO 2012 and 2024 guidelines recommend 0.6–0.8 g/kg for non-dialysis CKD stages 3–5.
Your recommended daily protein intake is calculated based on your body weight, activity level, and health or fitness goal. For sedentary adults, the Recommended Dietary Allowance (RDA) of 0.8 g/kg/day represents the minimum needed to prevent deficiency in most healthy adults, though many nutrition experts consider this a floor rather than an optimal target. Moderately active individuals benefit from 1.0–1.4 g/kg/day to support tissue repair and maintain muscle mass. Athletes and those pursuing muscle gain typically need 1.6–2.2 g/kg/day, with evidence suggesting that intakes above 2.2 g/kg provide diminishing returns for muscle protein synthesis.
For individuals in a caloric deficit (weight loss), higher protein intake (1.2–1.6 g/kg/day) is recommended to preserve lean body mass and promote satiety. Distributing protein intake across 3–5 meals (approximately 20–40 grams per meal) optimizes muscle protein synthesis throughout the day.
Use this calculator when setting nutritional targets for general health, athletic performance, muscle building, or weight loss. It is helpful for individuals beginning a structured diet or exercise program, athletes adjusting [macronutrient ratios](/tools/macro-calculator) for training phases, and healthcare providers or dietitians counseling patients on adequate protein intake. Combine with our [Calorie Calculator](/tools/calorie-calculator) to determine your full nutritional targets.
This tool is also useful for older adults (65+), who have increased protein needs (1.0–1.2 g/kg/day or higher) to counteract age-related muscle loss (sarcopenia) and maintain functional independence. During recovery from surgery, burns, or critical illness, protein requirements increase further (1.5–2.0 g/kg/day), though those situations require individualized clinical guidance.
This calculator provides general evidence-based ranges and does not account for individual medical conditions that alter protein requirements. Patients with chronic kidney disease (CKD stages 3–5, not on dialysis) are typically advised to restrict protein to 0.6–0.8 g/kg/day to slow disease progression, while those on hemodialysis paradoxically need higher protein (1.0–1.2 g/kg/day) to compensate for dialytic losses. Patients with hepatic encephalopathy from liver disease may also need modified protein intake under medical supervision.
The calculator uses total body weight, which may overestimate needs in individuals with obesity. For those with a [BMI](/tools/bmi-calculator) above 30, using adjusted body weight or [ideal body weight](/tools/ideal-weight) may provide a more appropriate estimate. Additionally, protein quality matters — animal proteins and soy provide all essential amino acids, while most individual plant proteins are incomplete and should be combined to achieve a full amino acid profile. The calculator does not differentiate between protein sources or account for bioavailability differences.
Disclaimer: This tool is for educational and informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider with questions about your health.
April 21, 2026 · trust-baseline
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