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Calculate your clean bulk calories, macros, and expected monthly gain rate. Surplus scales to your training experience so you add muscle without stacking on fat.
1 to 3 years of consistent training. Slower, cleaner gains.
Enter your details above to see your lean bulk targets.
A lean bulk is a small, controlled calorie surplus designed to add muscle with minimal fat gain. Instead of eating every calorie in sight, you eat just enough above maintenance to support muscle growth. For most trained lifters that is 10 to 15% above TDEE, which works out to 200 to 400 calories per day.
The goal is a gain rate of 0.25 to 0.5% of body weight per week. Slower than that and you are basically maintaining. Faster and fat gain starts to outpace muscle gain. A 180 lb lifter should be gaining about 0.5 to 1 lb per week at most.
Lean bulk
Small surplus of 10 to 15%. Tracks calories and protein. Gains 1 to 3 lb per month. Body fat stays in a normal range. Minimal cutting needed after.
Dirty bulk
Large surplus of 500+ calories with no tracking. Gains 5+ lb per month. Most of it is fat. Requires a long aggressive cut after to reveal the muscle gained.
Research in trained lifters consistently shows you cannot force faster muscle growth by eating more than a modest surplus. Extra calories past that ceiling go to fat storage, not muscle.
A good bulk runs 12 to 20 weeks. Shorter than 12 weeks and you do not give your body enough time to add meaningful muscle. Longer than 20 weeks and body fat creeps high enough to hurt insulin sensitivity and recovery.
Signals it is time to stop bulking and switch to maintenance or a cut:
Start at your TDEE plus a small surplus. Beginners can use 15% (roughly 400 calories above maintenance). Intermediates use 10% (about 250-300 calories). Advanced lifters use 7.5% (around 150-200 calories). A 180 lb intermediate male at a TDEE of 2,800 eats roughly 3,080 calories per day.
Aim for 0.9g per pound of body weight. This supports muscle protein synthesis without wasting calories on excess protein. A 180 lb lifter targets about 162g of protein per day. Going above 1.0g/lb does not add extra muscle building benefit in a surplus.
Beginners: 2 to 3 lb per month. Intermediates: 1 to 2 lb per month. Advanced lifters: 0.5 to 1 lb per month. Gaining faster than this means a higher fat-to-muscle ratio. If the scale jumps more than 1% of body weight per week, cut the surplus in half.
Even on a clean bulk, some fat gain is unavoidable. Beginners typically gain at roughly 50% muscle and 50% fat. Intermediates see about 60% muscle to 40% fat with careful eating. Advanced lifters often see 40% muscle and 60% fat, which is why their surplus needs to stay small.
Most lean bulks run 12 to 20 weeks. Shorter than 12 weeks and you do not gain meaningful muscle. Longer than 20 weeks and body fat usually creeps too high, which can reduce insulin sensitivity and hormone output. Cut back to maintenance or a short mini-cut when body fat hits around 15% for men or 23% for women.
Yes. The same percentages apply, but women gain muscle at roughly half the rate of men, so expect 0.5 to 1.5 lb per month as a realistic ceiling. Protein at 0.9g/lb still applies. Do not go below 20% of calories from fat, since hormone production depends on dietary fat.
Yes, 2 to 3 sessions of 20-30 minutes per week. Low-intensity cardio improves recovery, appetite regulation, and cardiovascular health without cutting into your surplus. Skip excessive cardio. If you are doing 5+ long sessions per week, you will need to eat more to stay in a surplus, which usually means more fat gain.
FitCommit calculates your lean bulk targets from AI body composition analysis, then tracks calories and macros with camera-based food scanning. Free 1-month trial.
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