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The Protein Intake Calculator determines your optimal daily protein requirement based on body weight, activity level, and fitness goals. Protein is the most essential macronutrient for muscle repair, immune function, enzyme production, and satiety. The Recommended Dietary Allowance (RDA) of 0.8 g/kg is the minimum to prevent deficiency in sedentary adults, but athletes, older adults, and those in caloric deficit need substantially more. This calculator uses evidence-based multipliers from sports nutrition research to provide personalized protein targets ranging from 0.8 g/kg for sedentary individuals up to 2.2 g/kg for those focused on muscle hypertrophy.
- 1Enter your body weight in kilograms or pounds (the calculator converts automatically).
- 2Select your primary activity level: sedentary, lightly active, moderately active, very active, or athlete.
- 3Choose your fitness goal: maintain weight, lose fat, or build muscle.
- 4The calculator selects the appropriate multiplier (0.8-2.2 g/kg) based on your activity and goal combination.
- 5Your daily protein target in grams is computed by multiplying your weight in kg by the selected multiplier.
- 6The result also shows protein as a percentage of total calories and suggests a per-meal distribution across 3-5 meals.
- 7An optional lean body mass adjustment is available if you know your body fat percentage, giving a more accurate target for overweight individuals.
70 kg × 0.8 g/kg = 56 g. This is the RDA minimum for a sedentary adult who is not trying to gain or lose weight.
80 kg × 1.6 g/kg = 128 g. Higher protein during a caloric deficit preserves lean mass and increases satiety. Research shows 1.6 g/kg is the sweet spot for active individuals cutting.
90 kg × 2.0 g/kg = 180 g. Resistance-trained individuals aiming for hypertrophy benefit from 1.6-2.2 g/kg. The calculator uses 2.0 g/kg as a balanced midpoint for very active lifters.
65 kg × 1.2 g/kg = 78 g. Adults over 65 have blunted muscle protein synthesis and benefit from 1.0-1.2 g/kg even at lower activity levels, per the PROT-AGE study group recommendations.
Bodybuilders and strength athletes planning meal prep to hit precise protein targets for hypertrophy.
Dietitians creating personalized nutrition plans for patients recovering from surgery or illness.
Older adults working with geriatricians to prevent age-related muscle loss (sarcopenia).
Weight-loss clients ensuring adequate protein to preserve lean mass during caloric restriction.
Endurance athletes adjusting protein intake around long training sessions for recovery.
Pregnancy and Lactation
Pregnant women need an additional 25 g/day of protein (especially in the 2nd and 3rd trimesters), and lactating women need an extra 15-20 g/day to support milk production and fetal development.
Renal Impairment
Individuals with chronic kidney disease (CKD stages 3-5) who are not on dialysis are typically restricted to 0.6-0.8 g/kg to reduce nitrogen waste. Those on dialysis may need 1.0-1.2 g/kg due to protein losses during treatment.
Post-Surgery Recovery
Patients recovering from major surgery, burns, or trauma may require 1.5-2.0 g/kg to support wound healing and prevent muscle catabolism during bed rest.
| Activity Level / Goal | Multiplier (g/kg) | Example (75 kg person) |
|---|---|---|
| Sedentary, maintain weight | 0.8 | 60 g/day |
| Lightly active, maintain | 1.0–1.2 | 75–90 g/day |
| Moderately active, maintain | 1.2–1.4 | 90–105 g/day |
| Active, fat loss | 1.6–2.0 | 120–150 g/day |
| Very active, muscle building | 1.6–2.2 | 120–165 g/day |
| Endurance athlete | 1.2–1.7 | 90–128 g/day |
| Older adult (65+) | 1.0–1.2 | 75–90 g/day |
Is 0.8 g/kg enough protein for someone who exercises?
No. The 0.8 g/kg RDA is the minimum to prevent deficiency in sedentary adults. Active individuals should aim for 1.2-2.0 g/kg depending on exercise intensity and goals.
Can too much protein damage my kidneys?
In healthy individuals with normal kidney function, protein intakes up to 2.2 g/kg have shown no adverse renal effects in studies lasting up to a year. Those with pre-existing kidney disease should consult a physician.
Should I use total body weight or lean body mass?
For most people, total body weight works fine. If your body fat percentage is above 30%, using lean body mass (weight × (1 - body fat %)) gives a more accurate target and avoids overestimating needs.
Does the timing of protein matter?
Distributing protein evenly across 3-5 meals (25-40 g per meal) optimizes muscle protein synthesis better than consuming the same total in one or two large meals.
Do plant-based proteins count the same as animal proteins?
Plant proteins have lower digestibility and often lack one or more essential amino acids. Vegans should aim for the higher end of their range and combine complementary protein sources (e.g., rice + beans).
专业提示
If hitting your protein target feels difficult, front-load it: aim for 30-40 g at breakfast (e.g., eggs + Greek yogurt) when most people under-eat protein, and the rest of the day becomes much easier.
你知道吗？
The word 'protein' comes from the Greek 'proteios' meaning 'of the first rank' — fitting, since protein is the only macronutrient the body cannot synthesize from the other two.