Protein calculator
Calculator
The calculator needs JavaScript. The tables below give the same numbers for common cases.
How it is worked out
- Protein = body weight in kg × grams per kg = 70 × 0.8 = 56 g.
- The 0.8 g per kg figure is the recommended dietary allowance for healthy adults; higher levels are commonly used for athletes. People with kidney or other conditions should follow their doctor's advice.
| Inputs | Answer |
|---|---|
| Units: Metric (cm, kg); Body weight: 70; Level: Adult recommended allowance (0.8 g per kg) | At 0.8 g per kg, a person weighing 70 kg needs about 56 grams of protein a day. |
| Units: Metric (cm, kg); Body weight: 80; Level: Strength or endurance training (1.6 g per kg) | At 1.6 g per kg, a person weighing 80 kg needs about 128 grams of protein a day. |
| Units: US (inches, pounds); Body weight: 165; Level: Active adult (1.2 g per kg) | At 1.2 g per kg, a person weighing 74.8 kg needs about 90 grams of protein a day. |
How to use it
The recommended dietary allowance for protein in healthy adults is 0.8 grams per kilogram of body weight a day. Higher intakes, often 1.2 to 2.0 grams per kilogram, are commonly used by people who train regularly. The calculator multiplies your body weight by the level you choose.
People with kidney disease or other medical conditions should follow their doctor's advice about protein. This is general information and an estimate, not medical advice; talk to a healthcare professional about your own situation.
Frequently asked questions
How much protein do I need a day?
The adult recommended allowance is 0.8 g per kg of body weight; active people often eat more.
How many calories is 100 g of protein?
About 400 kilocalories (4 per gram).
Can I eat too much protein?
Very high intakes may be unsuitable for some people, such as those with kidney disease; ask a professional.
Method: standard arithmetic shown step by step; no outside data is used. Checked 2026-11-12.
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General information only. Results are plain arithmetic on the numbers you enter; check anything important (money, health, school work) against your own records or the official source.