How Much Protein to Build Muscle? What the Research Agrees On

To build muscle, eat about 1.6 g of protein per kilogram of body weight a day (0.7 g per pound). That is where the largest meta-analysis on the question found extra protein stopped adding muscle, and going up to 2.2 g/kg (1 g/lb) covers nearly everyone. Beyond that, extra protein builds nothing more.

How much protein do you need per day to build muscle?

Aim for 1.6 g/kg (0.7 g/lb) a day. A meta-analysis of 49 trials with 1,863 participants found that muscle gains from extra protein plateaued at 1.62 g/kg/day; its confidence interval—the range the true answer probably sits in—ran from 1.03 to 2.20 g/kg (Morton et al., 2018).

That means 2.2 g/kg (1 g/lb) is a sensible number if you want margin for error. The ISSN’s recommended range for most exercising people, 1.4–2.0 g/kg/day, overlaps with that finding (ISSN position stand). Protein added about 0.3 kg (0.7 lb) of fat-free mass—everything that isn’t fat: muscle, water, bone, and organs—on average. It helps training pay off; it does not replace training.

• 1.6 g/kg = 0.73 g/lb: the practical target for most lifters.
• 2.2 g/kg = 1.0 g/lb: the upper end for maximum coverage.

For more help with muscle-gain nutrition, plug your weight into our protein intake calculator.

Is "1 gram per pound" right, or too much?

One gram per pound is 2.2 g/kg, the top of the useful range, not the minimum. It is an easy rule that covers nearly everyone, but most lifters should get the same result around 0.7 g/lb (Morton et al., 2018).

The rule has a grain of truth: extra margin can cover a mislogged meal or a low-protein day. But if 1 g/lb makes your diet miserable or crowds out carbs you need for training, drop to 0.7–0.8 g/lb. If you carry a lot of body fat, base your target on goal weight rather than current weight.

What does the RDA of 0.8 g/kg mean for lifters?

The RDA of 0.8 g/kg is meant to prevent deficiency in the general population, not maximize muscle gain. Lifters trying to grow should aim roughly twice as high; pages that give lifters the RDA are answering a different question.

The RDA is a health floor, set for mostly inactive adults. At 1.6 g/kg, a muscle-building target is double that amount, and the ISSN’s range for exercising people starts at 1.4 g/kg (ISSN position stand).

How much protein should you eat per meal?

Split your daily total into 3–4 feedings of roughly 0.4 g/kg each, spaced a few hours apart. That works out to about 30–40 g for many men and 25–30 g for many women, and it makes the daily target easier to reach.

• Schoenfeld and Aragon recommend 0.4 g/kg per meal across at least four meals to reach 1.6 g/kg; up to 0.55 g/kg per meal covers 2.2 g/kg (Schoenfeld & Aragon, 2018).
• The ISSN suggests 0.25 g/kg or 20–40 g per dose, distributed every 3–4 hours (ISSN position stand).
• The “30 g absorption limit” is a myth. In an acute study of young men after whole-body training, 100 g produced a greater and longer-lasting anabolic response than 25 g, lasting over 12 hours (Trommelen et al., 2023).

That single-session study does not prove one giant meal builds as much muscle over time. Protein above 30 g is not thrown away; 3–4 feedings are simply a practical way to hit your total consistently, and exact timing matters far less than that total (see whether the anabolic window is real). For a 180 lb (82 kg) lifter, the table puts the daily target and per-meal amounts in context.

How do protein targets change by situation?

For most lifters, 1.6 g/kg (0.7 g/lb) is a solid daily target, while higher amounts may suit a deficit or a desire for more margin. The table uses a 180 lb (82 kg) lifter as a worked example.

The 180 lb examples are rounded arithmetic using 82 kg; the research ranges are supported by Morton et al., the ISSN, Schoenfeld and Aragon, Nunes et al., and Antonio et al..

When should you eat more than 1.6 g/kg?

Go toward 2.2 g/kg, or higher, if you’re in a calorie deficit, already well trained, or want margin for error. For trained lifters dieting, the ISSN says 2.3–3.1 g/kg may be needed to retain lean mass (ISSN position stand).

• Calorie deficit: More protein can help protect lean mass when energy is short; the higher range is for trained lifters in hypocaloric periods.
• Well trained: Morton’s analysis found protein supplementation had a larger effect in resistance-trained people than in beginners (Morton et al., 2018).
• Older lifters: A review found lean-mass benefits at 1.2–1.59 g/kg in adults 65+ and at 1.6 g/kg or more in younger adults (Nunes et al., 2022). Aim for 1.6 g/kg and be consistent with per-meal doses.

Is 200 g of protein too much?

For muscle gain, 200 g a day makes sense mainly if you weigh about 200 lb (91 kg) or more; that is already around 2.2 g/kg, the top of the useful range. Above that, extra protein has not been shown to add muscle.

In an eight-week trial, trained lifters eating 4.4 g/kg/day had no significant changes in body weight, fat mass, or fat-free mass compared with the control group (Antonio et al., 2014). For a lifter, the practical costs of excess protein are fewer carbs for training, a higher grocery bill, and a harder diet to stick to. If you have kidney disease, follow your doctor’s protein advice.

What if you eat enough protein and still aren't growing?

Then protein probably isn’t your bottleneck. If you’ve hit about 1.6 g/kg across 3–4 meals for two months and nothing has changed, check your training, calorie intake, and sleep.

Morton’s analysis found about 0.3 kg (0.7 lb) of extra fat-free mass from supplementation on average, on top of resistance training (Morton et al., 2018). Training remains the driver, so check:

• Are you doing enough sets per muscle group per week?
• Do your sets stop three or more reps short of failure?
• Is there a clear rule that pushes your load up over time?
• Are you eating at maintenance while expecting growth? Review how big your calorie surplus should be.
• Do weekends undo the week’s food intake?

If you’ve checked those basics and still can’t spot the limiter, find out which bottleneck is actually holding you back. A protein shake won’t fix a stall if protein is already covered; start with the most common reasons muscle stops coming.

FAQ

Is 200g of protein too much for muscle gain?

Only if you weigh much less than 200 lb (91 kg). At 200 lb, 200 g is about 2.2 g/kg, the top of the useful range; an eight-week trial found no added muscle or fat change at 4.4 g/kg (Antonio et al., 2014). More than that is an expensive diet without extra muscle.

Is 100g of protein enough to keep muscle?

It depends on your weight. At 150 lb (68 kg), 100 g is about 1.5 g/kg, close to the 1.6 g/kg growth target; at 200 lb (91 kg), it is about 1.1 g/kg, short of that target. Maintenance needs depend on your overall situation.

Is 3 eggs a day enough protein for muscle gain?

No, not on their own. Three large eggs provide about 19 g of protein, or 6.3 g each, based on USDA data cited in Nutrients. Treat eggs as one protein feeding, not your whole day’s plan.

How do I get 150g of protein a day?

Split it into four feedings of roughly 35–40 g each; that is easier for most people than two huge meals. A protein breakfast, meat or fish lunch, dairy-based snack, and protein-heavy dinner can get you there. 150 g is about right for a 205 lb (93 kg) lifter at 1.6 g/kg.