Protein Intake

Turning Body Weight and Activity Level Into a Protein Range

Recommended daily protein intake is commonly expressed as a range of grams per kilogram of body weight, rising from the RDA baseline for sedentary adults up through higher targets for athletic training and muscle building. Enter your body weight and how active you are, and this calculator returns your recommended daily protein range in grams.

This is distinct from the Macro Calculator calculator, which splits an already-known daily calorie target into protein, carb, and fat grams — this calculator instead answers the direct question of how much protein to eat, with no calorie target needed first.

The Formula

$$\vC{\text{Protein Range}} = \vA{\text{Body Weight (kg)}} \times \vB{\text{g/kg Range for Activity Level}}$$

Worked Example

A 70 kg person who is moderately active:

$$\vA{70} \times \vB{[1.2,\ 1.6]} = \vC{84\text{–}112} \text{ g/day}$$

Key Factors to Consider

• These recommendations increase with activity level because exercise, especially resistance training, increases the body’s need for protein to repair and build muscle tissue. Someone who is sedentary needs less protein than someone doing regular strength training, which is why this calculator’s higher ranges are aimed specifically at athletic and muscle-building goals rather than general everyday activity.
• Spreading protein intake across multiple meals throughout the day is commonly recommended for supporting muscle protein synthesis, rather than eating it all in one sitting. Many nutrition guidelines suggest 3-4 evenly-spaced protein-containing meals rather than one very large protein-heavy meal, since the body can only use so much protein for muscle building at once.
• Protein quality (which specific amino acids a source provides) matters alongside total quantity. Animal proteins and some plant combinations (like rice and beans together) provide a more “complete” amino acid profile than some individual plant protein sources alone — this calculator estimates a total gram target, not a breakdown of protein source quality.
• Very high protein intake beyond these ranges generally provides diminishing returns for most goals. Once intake is already comfortably within the upper end of the athletic/muscle-building range, further increases typically don’t meaningfully add extra muscle-building benefit — additional calories from other macronutrients are often better allocated elsewhere once protein needs are already met.

Common Mistakes

• Assuming that more protein is always better, with no upper limit. Intake above the athletic/muscle-building range generally doesn’t add further benefit for most people — extra calories are usually better spent on carbohydrates or fats once protein needs are already met.
• Using total body weight when a high body fat percentage would call for a leaner target weight. Since protein needs scale more closely with lean mass than total weight, someone with a higher body fat percentage may get a more accurate range from an estimated lean body weight.
• Eating most of the day’s protein in a single large meal. The body can only use so much protein for muscle building at once — spreading intake across 3-4 meals is more commonly recommended for supporting muscle protein synthesis than one very large protein-heavy meal.

Useful to Know

• Already know your daily calorie target and want to split it into protein, carbs, and fat? Macro Calculator divides a calorie target into macronutrient grams.
• Need to work out that calorie target first? Calorie / TDEE Calculator estimates total daily energy expenditure from your body stats and activity level.
• Want a more precise lean-mass figure to base your protein target on? Lean Body Mass Calculator estimates lean body mass using several published formulas.