How Much Protein Do You Need to Build Muscle? Grams per Kilogram Explained
October 21, 2026
Meta-analyses of resistance-training studies suggest that muscle growth plateaus at about 1.6 grams of protein per kilogram of body weight per day (0.73 g per pound), with an upper range near 2.2 g/kg for those who want a margin of safety. For an 80 kg person, that is roughly 128 to 176 grams a day. The general adult recommendation for avoiding deficiency is much lower, at 0.8 g/kg.
Skip the math and get your answer instantly:
Open the Protein Calculator →Protein Ranges by Goal
The ranges below are common evidence-based guidelines for healthy adults. Individual needs vary with age, kidney health, and training volume, so check with a healthcare professional if you have a medical condition.
| Goal | g per kg per day | 80 kg person |
|---|---|---|
| General health (RDA) | 0.8 | 64 g |
| Active, maintaining muscle | 1.2 to 1.6 | 96 to 128 g |
| Building muscle | 1.6 to 2.2 | 128 to 176 g |
| Cutting, preserving muscle | 1.8 to 2.7 | 144 to 216 g |
Why More Is Not Always Better
Beyond about 2.2 g/kg, studies generally find no extra muscle gain for most people. Protein also has a high satiety effect, so very high intakes can crowd out carbohydrates and fats that support training and recovery.
In people with healthy kidneys, intakes in this range have not been shown to cause kidney damage. People with existing kidney disease should follow their doctor's guidance.
Making the Number Practical
Spread protein across three to five meals, each with roughly 0.3 to 0.4 g/kg (24 to 32 g for an 80 kg person), so that each meal gives a strong stimulus to muscle protein synthesis. Whole foods like chicken, fish, eggs, dairy, tofu, and legumes can cover most of it, and powders are a convenience, not a requirement.
Weigh the options against your total calories. Hitting protein targets while in a calorie surplus builds muscle, while in a deficit it helps preserve it.
Frequently Asked Questions
How many grams of protein per day do I need to build muscle?
About 1.6 to 2.2 g per kg of body weight. For an 80 kg person, that is roughly 128 to 176 g per day.
Is 2 g per kg too much?
For healthy adults it is generally considered safe and within the range studied for muscle gain, though you may not need that much.
Does protein timing matter?
Total daily intake matters most. Spreading protein across meals and having some after training can help slightly, but it is secondary.
Do I count protein per pound of body weight or lean mass?
Most studies use total body weight. If you have a lot of body fat, using a target body weight or lean mass is reasonable.