Daily Protein Requirements: Science-Based Calculator

Calculate your daily protein requirements based on weight, age, and goals. Science-backed ranges for muscle gain, fat loss, and healthy aging.

Frequently Asked Questions

How much protein do I need per day?
Most adults need 1.2 to 2.2 grams of protein per kilogram of body weight daily. The exact amount depends on your activity level, age, and goals. The government RDA of 0.8 g/kg is a minimum to prevent deficiency, not an optimal target.
Is 100 grams of protein a day enough?
For a sedentary person weighing around 70 kg, 100 grams exceeds the recommended range and is sufficient. For a 90 kg person doing strength training, 100 grams falls short of the 1.6-2.2 g/kg target. Your ideal intake depends on body weight and activity.
Can too much protein damage your kidneys?
In healthy adults, protein intakes up to 2.2 g/kg per day show no adverse kidney effects in long-term studies. People with pre-existing kidney disease should consult their doctor before increasing protein intake.
Do older adults need more protein than younger adults?
Yes. Adults over 65 benefit from 1.0 to 1.2 g/kg daily to counteract age-related muscle loss (sarcopenia). The PROT-AGE study group recommends even higher intakes of 1.2 to 1.5 g/kg for older adults who are exercising or recovering from illness.
How do I calculate my daily protein intake?
Multiply your body weight in kilograms by the protein factor that matches your activity level: 1.0-1.2 for sedentary, 1.2-1.4 for light activity, 1.4-1.6 for endurance training, 1.6-2.2 for strength training, and 1.8-2.4 if you are in a calorie deficit.
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