Guide September 2026 · 7 min read

How Many Calories and How Much Protein to Build Muscle

Quick answer: To build muscle you need three things in this order: a resistance-training programme that progresses, enough protein — 1.6–2.2 g per kg of body weight a day, spread across 3–4 meals — and a modest calorie surplus of about 200–300 kcal above maintenance (roughly 5–10%). Muscle is built slowly: 0.25–0.5 kg a month for most trained adults, up to 1 kg a month for beginners. A surplus bigger than the body can turn into muscle is stored as fat, which is why "eat big" bulks mostly build a cut you will have to do later.

What actually drives muscle growth

Training provides the stimulus. Protein provides the material. Calories provide the energy to use it. Remove any one and growth stalls:

No progressive training → protein and calories become fat.
Not enough protein → the body cannot build tissue faster than it breaks it down, whatever the calories.
No surplus → growth is possible (especially for beginners and people returning after a break) but slow; the body is reluctant to build expensive tissue while energy is scarce.

Sleep is the fourth input. Under 7 hours measurably reduces muscle protein synthesis and training performance. It is not optional.

Step 1: Maintenance calories

Estimate TDEE with the Mifflin-St Jeor equation and an activity factor — the full method is in How to calculate your calorie deficit; the same estimate works in the other direction. For someone training 4 times a week, use the "moderately active" factor of 1.55.

Example: man, 28, 75 kg, 180 cm, training 4×/week. RMR = 750 + 1,125 − 140 + 5 = 1,740 kcal. TDEE ≈ 1,740 × 1.55 ≈ 2,700 kcal.

Step 2: The surplus

Surplus	Monthly weight gain (approx.)	Who
0 (maintenance)	~0	Beginners, returning lifters, people who want no fat gain — slow but real growth
+200–300 kcal	0.5–1 kg	Most people; the "lean bulk" default
+500 kcal	2 kg	Beginners with fast recovery; expect a meaningful share as fat
+1,000 kcal	4 kg	Almost all of the extra is fat; not recommended

The body's ceiling for building muscle is about 0.25–0.5 kg a month for intermediate lifters and up to 1 kg for beginners in the first year. Any weight gained beyond that is not muscle. A 300 kcal surplus produces roughly 1 kg of weight gain a month, which for most people is close to the muscle ceiling with little fat.

For the example: 2,700 + 250 ≈ 2,950 kcal a day.

Step 3: Protein

1.6–2.2 g per kg of body weight. Meta-analyses of resistance-training studies find muscle gains rising with protein intake up to about 1.6 g/kg, with a smaller possible benefit up to 2.2 g/kg and none above. For the 75 kg example: 120–165 g a day, with 140 g a comfortable target.

Per meal: 0.4 g/kg, or 30–40 g for most adults, three to four times a day. Muscle protein synthesis is triggered per meal, so 40 g at dinner and 10 g at breakfast wastes most of the day. The details are in How much protein per day.

Timing: the "anabolic window" after training is wider than the old 30-minute rule — a protein-containing meal within about two hours either side of a session is sufficient. Total daily intake and per-meal distribution matter far more than the clock.

Source: animal proteins (meat, fish, eggs, dairy, whey) are complete and efficiently used. Plant-based lifters should aim toward the top of the range (2.0–2.2 g/kg) and combine sources — soy, legumes plus grains, pea protein.

Step 4: Carbs and fat

Once protein is set, the rest of the calories are split between carbohydrate and fat, and the split matters less than people argue about.

Carbohydrates fuel training. Moderate-to-high carbs (4–6 g/kg on training days for most) improve session quality, which is what produces growth. Low-carb bulks are possible but harder.
Fat around 0.8–1 g/kg supports hormones and makes food easier to eat. Below ~0.5 g/kg is a mistake.
Fiber still matters. 25–35 g. A 3,000 kcal day of white rice and chicken is hungry-then-bloated; the same day with oats, fruit and vegetables is easy.

For the example (2,950 kcal, 140 g protein): protein 560 kcal; fat ~70 g = 630 kcal; carbs fill the rest ≈ 440 g = 1,760 kcal.

What a 3,000 kcal day looks like

Breakfast: 4 eggs, 2 slices whole-grain toast, a banana, a glass of milk — ~40 g protein
Lunch: 150 g chicken breast, 200 g cooked rice, vegetables, olive oil — ~45 g protein
Post-training: whey shake with milk and oats — ~35 g protein
Dinner: 150 g salmon, 250 g potatoes, salad — ~40 g protein
Evening: Greek yogurt with berries and nuts — ~20 g protein

Total ~180 g protein, ~3,000 kcal, ~30 g fiber. The point of the example: every meal has 30+ g of protein, and there are five of them. That is the habit that distinguishes people who grow from people who train.

Step 5: Check after four weeks

The estimate is a starting point. After four weeks of eating the target and training consistently, look at the weekly average scale weight and strength in the gym:

Weight change	Strength	Verdict
+0.5–1 kg / month	Rising	Correct. Keep going.
No change	Rising	Surplus too small for your metabolism; add 150–200 kcal.
+2 kg / month	Rising	Too much; you are adding fat. Cut 200 kcal.
No change	Flat	Training, protein or sleep — not calories — is the problem.

Recalculate maintenance every 5 kg gained.

Common mistakes

"Dirty bulking." A 1,000 kcal surplus does not build muscle faster. It builds a 12-week cut you did not need.
Protein at dinner only. 150 g in one meal is not 150 g across the day.
Cardio phobia. Walking and light cardio improve recovery and appetite regulation. They do not "burn muscle" at moderate volumes.
Not logging the surplus. People under-eat on a bulk as often as they over-eat on a cut — busy days, skipped breakfasts, a surplus that only exists on paper. Log for two weeks and check.
Judging by daily weight. Creatine, carbs and salt swing the scale by 1–2 kg. Use the weekly average.

How CalMePlease handles a muscle goal

Choose "Gain muscle" at setup and the app sets a modest surplus and a protein target from body weight, then tracks protein per meal — not just per day — so a 10 g breakfast shows as a gap while there is still time to fix it. Activity from Apple Health feeds the coach: a heavy session plus a low-protein day produces a specific note about the next meal. Logging a 3,000 kcal day by photo and voice takes a couple of minutes, which is the difference between a surplus that exists and one you intended.

FAQ

How many calories do I need to build muscle? Your maintenance calories plus 200–300 kcal (about 5–10%). Bigger surpluses gain weight faster but most of the extra is fat.

How much protein should I eat to build muscle? 1.6–2.2 g per kg of body weight per day, spread across 3–4 meals of 30–40 g. For a 75 kg person, about 120–165 g.

Can I build muscle without a calorie surplus? Yes, especially as a beginner, when returning after a break, or with higher body fat — with high protein and progressive training. It is slower than with a small surplus.

How fast can I gain muscle? Roughly 0.25–0.5 kg a month for trained lifters, up to 1 kg a month for beginners in the first year. Weight gain faster than that is mostly fat.

Should I eat protein right after a workout? A protein-containing meal within about two hours of training is enough. Total daily protein and per-meal distribution matter more than timing.

Is 3,000 calories a day enough to build muscle? For a 70–80 kg man training regularly, usually yes; for a 60 kg woman it is a large surplus. Calculate from your own maintenance rather than a round number.

CalMePlease sets a surplus and protein target from your goal and tracks protein per meal, so the gap is visible before dinner. Free on the App Store.