How Much Protein Do You Need to Build Muscle?

Protein gets argued about constantly, yet it has one of the clearer answers in nutrition: a daily target in a sensible range, spread across your meals and hit consistently.

The number that matters

For someone training to build muscle, the evidence converges on 1.6–2.2 grams of protein per kilogram of bodyweight per day (roughly 0.7–1.0 g per pound). In the largest meta-analysis, the benefit leveled off around 1.6 g/kg, with 2.2 g/kg as the upper end of the estimate [1]. At maintenance or in a surplus, the lower half of the range is usually enough. In a calorie deficit, where protein also helps you keep the muscle you have, aim nearer the top, and if you're lean and dieting hard, guidance for physique athletes goes higher still: 2.3–3.1 g per kg of fat-free mass [2].

For an 80 kg (176 lb) lifter, that's about 130–175 g of protein a day. Our macro calculator sets your protein target alongside carbs and fat from your bodyweight and goal. MuscleBuddy uses 2.2 g/kg, the top of the range. If your BMI is above 25, it sizes protein from the weight a BMI of 25 gives for your height rather than your current weight, and if you log a body-composition reading it uses 2.75 g per kg of lean mass instead.

Why more isn't automatically better

Muscle protein synthesis, the process that builds new tissue, has a ceiling. Once you eat enough protein to max it out, your body burns the extra amino acids for energy rather than building more muscle. In the largest meta-analysis, which covered intakes up to about 2.4 g/kg, intakes above about 1.6 g/kg added no measurable muscle [1]. Past that point you're paying for calories (and money) that add little.

Does timing matter?

Less than supplement marketing suggests. The idea of a tight post-workout "anabolic window" that closes within 30–60 minutes hasn't held up well. Your total daily intake, hit consistently, matters far more. If your last meal before training and your first meal after are both within a few hours of the session, you're losing little by skipping the shake the moment you rack the bar.

Spreading protein across the day does appear to matter more than exact timing:

• 3–5 meals or snacks containing protein, spaced through the day, appear to support muscle protein synthesis better than the same total from one or two huge meals.
• Aim for roughly 0.3–0.5 g/kg per meal (about 25–40 g for most people) as a practical per-meal target.
• A protein-containing meal or snack within a few hours of training, before or after, is a reasonable, low-effort default.

Food first, supplements second

Whole food covers this range without much trouble: chicken, fish, eggs, Greek yogurt, cottage cheese, lean beef, tofu, and legumes all contribute. A whey or plant protein shake is a convenient way to close a gap on a busy day. Whey digests faster than most whole foods, but over a day its protein counts toward your total the same way.

Protein works alongside training volume and progressive overload. Start from a training program that fits your schedule and pair it with a protein target you can hit every day, including the days you're busy.

Putting it together

1. Set your target at 1.6–2.2 g/kg bodyweight per day, nearer the top in a deficit.
2. Spread it across 3–5 meals, roughly 25–40 g each.
3. Build it from whole food and use a shake to fill gaps.
4. Keep it consistent for weeks and months; one day's intake matters little.