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Protein is the most essential macronutrient for building and repairing tissues, producing enzymes and hormones, and supporting immune function. Whether you are an elite athlete, a weekend gym-goer, or simply trying to maintain good health, knowing your daily protein requirement is the foundation of sound nutrition planning.
The body cannot store protein the way it stores fat or glycogen. It is constantly broken down and rebuilt — a process called protein turnover. This means you need a consistent daily supply of dietary protein to meet your body's demands. When intake is insufficient, the body breaks down muscle tissue to obtain the amino acids it needs, leading to muscle loss, fatigue, and impaired recovery.
The Recommended Dietary Allowance (RDA) for protein, established by the Institute of Medicine, is 0.8 grams per kilogram of body weight per day for sedentary adults. However, this figure represents the minimum needed to prevent deficiency in most healthy adults — not the optimal amount for performance, body composition, or healthy aging.
Research consistently shows that active individuals, older adults, and those seeking to change their body composition benefit from higher intakes. Sports nutrition bodies including the International Society of Sports Nutrition (ISSN) recommend 1.4 to 2.0 g/kg/day for exercising individuals, and up to 2.2 g/kg/day for those in intense resistance training or cutting phases.
Protein needs vary significantly based on several key factors:
This calculator uses evidence-based multipliers derived from current research and dietary reference intakes to estimate your personalized protein range. Enter your body weight, activity level, and primary goal to receive your recommended daily protein intake along with a per-meal target to guide meal planning.
Meeting your protein target does not require elaborate supplementation. Whole food sources such as chicken breast, eggs, Greek yogurt, lentils, tofu, and fish can easily meet most people's needs. Protein supplements like whey or pea protein are convenient tools but are not superior to food sources for most individuals.
The calculator applies activity-based multipliers to your body weight:
A goal adjustment factor is then applied: muscle gain (+30%), weight loss (+20%), endurance (+40%). The recommended value is the midpoint of the range adjusted by your goal. Per-meal protein is calculated by dividing by 3 meals.
Your minimum protein is the floor — falling below this risks muscle loss. The maximum protein is a safe upper range supported by research; exceeding it provides diminishing returns for most people. The recommended protein is your personalized target. Aim to distribute intake evenly across meals — research shows that 20–40g per meal maximizes muscle protein synthesis per feeding.
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Range: 1.2–1.6 g/kg. Midpoint = 1.4 × 75 = 105g/day. Split into ~35g per meal across 3 meals.
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Range: 2.0–2.4 g/kg. Midpoint = 2.2 × 90 × 1.3 (goal adj) = ~257g/day for maximal muscle protein synthesis.
The Recommended Dietary Allowance (RDA) is 0.8 g/kg/day for sedentary adults, established by the Institute of Medicine. This is the minimum to prevent deficiency, not an optimal intake for performance or body composition goals.
For healthy individuals, intakes up to 2.2 g/kg/day are well-tolerated and safe. Very high intakes (above 3 g/kg/day for extended periods) may stress the kidneys in people with pre-existing kidney disease, but do not harm healthy kidneys according to current evidence.
Yes. Research shows that distributing protein evenly across 3–5 meals (20–40g per meal) maximizes muscle protein synthesis compared to consuming most protein in one meal. Post-exercise protein intake within 2 hours is particularly beneficial for recovery.
Animal proteins are complete proteins with high PDCAAS (Protein Digestibility-Corrected Amino Acid Score) and bioavailability. Most plant proteins are lower in one or more essential amino acids. However, by combining sources (e.g., rice + beans) or increasing total intake by ~10–20%, plant-based diets can fully meet protein needs.
Adults over 50 benefit from 1.2–1.6 g/kg/day due to anabolic resistance — a reduced ability to stimulate muscle protein synthesis from a given protein dose. Higher intakes help preserve muscle mass and prevent sarcopenia (age-related muscle loss).
Supplements are a convenient way to meet targets but are not necessary. Whole food sources (chicken, fish, eggs, dairy, legumes) are equally effective. Supplements are most useful when total intake falls short or as a post-workout convenience.
Yes. High-protein diets increase satiety, reduce appetite, and preserve lean muscle during caloric restriction. Studies show that 1.2–1.6 g/kg/day during weight loss preserves more lean mass compared to lower intakes.
Per 100g: chicken breast (31g), canned tuna (30g), Greek yogurt (10g per 100g, ~17g per 170g serving), eggs (13g), edamame (11g), lentils cooked (9g), cottage cheese (11g), tempeh (19g).
For a heavy, highly active individual (90kg+ athlete), 200g/day (~2.2 g/kg) is within the evidence-supported range and considered safe for those with healthy kidneys. It becomes harder to achieve through food alone and may require supplementation.
Use a nutrition tracking app (MyFitnessPal, Cronometer) to log meals. Learning the protein content of common foods — chicken breast (~30g/100g), eggs (~6g each), Greek yogurt (~15–17g/serving) — enables accurate estimation without constant tracking.
Roboculator Team
The Roboculator Team explains calculations, planning tools, and practical formulas in clear language for real-life situations.
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