How Much Protein Do You Need Per Day?

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Why protein is the most important macro

Protein does more for body composition than any other macronutrient. It provides the raw material — amino acids — that your body uses to build and repair muscle tissue. It also keeps you fuller for longer, which makes a calorie deficit easier to sustain. And because protein has the highest thermic effect of any macro, your body burns roughly 20–30% of protein calories just to digest it — compared to 5–10% for carbohydrates and barely 3% for fat.

In practice, this means two people at identical calorie intakes can have very different results depending on how much protein they eat. The person hitting 160–180 g per day preserves more muscle on a cut, recovers faster from training, and tends to feel less hungry than the person eating half that amount. Getting protein right is not a marginal adjustment — it is the foundation the rest of your diet sits on.

How much protein you actually need

The short answer: 0.7–1 gram of protein per pound of bodyweight per day, which converts to roughly 1.6–2.2 grams per kilogram. This range covers nearly every goal from weight maintenance to competitive bodybuilding.

Where you land within that range depends on your goal and situation:

• Maintenance or slight surplus (muscle building): 0.7–0.9 g/lb is adequate. Muscle protein synthesis is well-supported at this level, and going higher does not produce meaningfully more muscle.
• Calorie deficit (fat loss): Go closer to 1 g/lb. When calories are restricted, the body can break down muscle for fuel if protein is too low. Higher protein acts as a buffer, preserving lean mass while fat is lost.
• Very high body fat: Some coaches suggest basing protein on lean body mass or goal bodyweight rather than current weight, to avoid inflating the target unnecessarily. Using your goal weight as the input is a practical shortcut.
• Older adults (40+): Muscle protein synthesis becomes slightly less efficient with age, so going toward the upper end of the range is a sensible precaution for those over 40.

Targets by goal and bodyweight

Use this table as a starting-point reference. The macro calculator will give you a more precise number based on your full profile.

These numbers assume bodyweight is a reasonable proxy for lean mass. If you carry significant body fat and your goal weight is 30+ lb below your current weight, consider using your goal weight as the input rather than your current weight.

Best protein sources

The quality of a protein source comes down to its amino acid profile (whether it contains all essential amino acids) and how digestible it is. Animal proteins score high on both. Plant proteins vary more but can cover all amino acids when eaten across a varied diet.

High-protein foods to anchor your diet around: chicken breast, turkey, eggs and egg whites, Greek yogurt, cottage cheese, lean beef, canned tuna, salmon, and whey protein. For plant-based eaters: tofu, tempeh, edamame, lentils, chickpeas, and high-protein grains like quinoa. A full breakdown with grams per serving lives in the high-protein foods guide.

The practical goal: get protein from food first, and use supplements (whey, casein, or plant-based powder) to bridge any gap. Supplements are convenient but not necessary if your diet already delivers the target.

Does timing matter?

Total daily protein intake matters far more than when you eat it. That said, spreading your protein across 3–5 meals or snacks does offer a small advantage for muscle protein synthesis: each feeding stimulates muscle repair, and having multiple stimulation events across the day adds up compared to cramming the same total into one or two large meals.

The post-workout “anabolic window” — the idea that you must eat protein within 30 minutes of training or the session is wasted — is overstated. The actual window for enhanced muscle protein synthesis is closer to several hours. Eating protein around your workout is sensible, but the exact timing is far less important than hitting your daily total. If you train fasted in the morning and eat your first protein-rich meal at noon, you are not sabotaging your results.

One timing consideration that does hold up: a moderate protein dose (roughly 20–40 g) before bed, particularly from slower-digesting sources like cottage cheese or casein protein, supports overnight muscle protein synthesis. This is a useful addition for people who train regularly and want to optimize recovery.

Protein myths worth ignoring

• “You can only absorb 30 grams per meal.” Not true. The body absorbs essentially all the protein you eat; digestion just takes longer when portions are larger. Spreading intake across meals is helpful, but no protein is lost from bigger servings.
• “High protein destroys your kidneys.” This concern stems from research on people with pre-existing kidney disease. In healthy people, intakes well above 1 g per pound are not associated with kidney harm. If you have a kidney condition, consult your doctor before dramatically increasing protein.
• “You need protein within 30 minutes of a workout.” The post-workout window is several hours wide, not 30 minutes. Get your protein that day; the exact post-session timing is a minor detail.
• “More protein always means more muscle.” Returns diminish significantly above about 1 g per pound. Eating 1.5 or 2 g per pound is not meaningfully better for muscle gain than 1 g. The extra protein just displaces other macros or adds unneeded calories.

If you want to build muscle alongside your protein strategy, the muscle building guide covers the full picture, including training and calorie surplus.