---
type: Article
title: "Protein per Kilo of Bodyweight, Not per Cent"
description: "Why protein targets are published in grams per kilo of bodyweight, what the research ranges are, and what happens to a percentage when calories change."
resource: https://quietgains.app/journal/protein-per-kilo
tags: ["nutrition", "protein"]
timestamp: 2026-09-22
---

# Protein per kilo, not per cent

As a share of calories, protein moves whenever calories do. Per kilo of bodyweight, it stays put.

Nutrition · By [QuietGains](https://quietgains.app/about) · Published 22 September 2026 · Updated 22 September 2026 · 3 min

Research on protein and training reports intake in grams per kilo of bodyweight per day, not as a share of calories. The International Society of Sports Nutrition position stand gives 1.4 to 2.0 g per kg per day for most people who exercise [1]. A percentage of calories is a different number, and it moves.

Thirty per cent of 2,600 calories is 195 g of protein. At 2,100 calories the same thirty per cent is 158 g, 37 g less, though only the calorie total changed.

> Published protein ranges follow bodyweight, not the calorie total.

## What the research reports

Each source below gives its range per kilo, of bodyweight or of lean body mass.

| Source | Protein |
| --- | --- |
| Recommended Dietary Allowance, adults | 0.8 g per kg of bodyweight [4] |
| ISSN position stand, most people who exercise | 1.4 to 2.0 g per kg of bodyweight [1] |
| Meta-analysis of 49 training studies | No further gain in fat-free mass beyond about 1.6 g per kg of bodyweight [2] |
| Trained lifters in an energy deficit | 2.3 to 3.1 g per kg of lean body mass [3] |

At 80 kg, 1.4 to 2.0 g per kg is 112 to 160 g, whether the day holds 2,100 calories or 3,000. It changes only when bodyweight does.

## Then fat, then what is left

The Institute of Medicine puts the acceptable range for fat at 20 to 35 per cent of energy for adults [4]. Worked out in that order, protein per kilo first, fat as a share, carbohydrate from what remains, the arithmetic has a useful property.

A change in calories moves carbohydrate and fat. Protein stays where it was set, because it was never a share of the total. The QuietGains [starting targets](https://quietgains.app/#fuel) are worked out in the same order.

## Per kilo of what?

Most ranges use total bodyweight. The contest preparation review by Helms and colleagues uses lean body mass instead [3]. For someone weighing 100 kg with 20 kg of fat mass, 2.3 g per kg of lean body mass is 184 g, where 2.3 g per kg of bodyweight would be 230 g.

## How the sources spread it across a day

- The ISSN reports per-meal doses of 0.25 g of protein per kg of bodyweight, or 20 to 40 g [1].
- It describes those doses as evenly distributed, every 3 to 4 hours, across the day [1].
- The contest preparation review reports three to six meals a day, with 0.4 to 0.5 g per kg of bodyweight in the meals before and after training [3].

Related tool: The macro calculator works protein out per kilo of bodyweight, fat as a share of calories and carbohydrate from what remains, and shows the sum for each. [Open the calculator](https://quietgains.app/tools/macro-calculator)

## Sources

1. Jäger R, Kerksick CM, Campbell BI, et al. International Society of Sports Nutrition Position Stand: protein and exercise. Journal of the International Society of Sports Nutrition 14:20, 2017. https://doi.org/10.1186/s12970-017-0177-8
2. Morton RW, Murphy KT, McKellar SR, et al. A systematic review, meta-analysis and meta-regression of the effect of protein supplementation on resistance training-induced gains in muscle mass and strength in healthy adults. British Journal of Sports Medicine 52(6):376-384, 2018. https://doi.org/10.1136/bjsports-2017-097608
3. Helms ER, Aragon AA, Fitschen PJ. Evidence-based recommendations for natural bodybuilding contest preparation: nutrition and supplementation. Journal of the International Society of Sports Nutrition 11:20, 2014. https://doi.org/10.1186/1550-2783-11-20
4. Institute of Medicine. Dietary Reference Intakes for Energy, Carbohydrate, Fiber, Fat, Fatty Acids, Cholesterol, Protein, and Amino Acids. The National Academies Press, Washington, DC, 2005. https://doi.org/10.17226/10490

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