Calories to Gain Muscle — TDEE + Surplus Calculator
To build muscle, you need a caloric surplus — but too much surplus leads to fat gain. Calculate your TDEE, then add the right surplus for lean muscle gains.
How It Works
Muscle requires energy beyond maintenance to synthesize new tissue. Research shows 250–350 kcal/day surplus maximizes muscle gain while minimizing fat gain for most lifters.
Beginners (first 1–2 years of serious training) can gain ~1 kg muscle/month in a surplus. Intermediates drop to ~0.5 kg/month. Beyond that, 'recomp' (maintaining or cutting) is often more effective.
Frequently Asked Questions
How many extra calories to build muscle?
250–350 kcal above TDEE for lean bulk. Example: TDEE 2,800 → eat 3,100 kcal. Larger surpluses (500+) lead to mostly fat gain, not additional muscle.
Do I need a surplus to build muscle?
Not always. Beginners and over-fat individuals can build muscle at maintenance or even in a deficit ('body recomposition'). Intermediate+ lifters generally need a surplus for meaningful muscle gains.