Bulking Calorie Calculator

The right bulking calorie target is your TDEE plus a small surplus. Eat too little and you stall. Eat too much and you just get fat — your body has a hard ceiling on how fast it builds muscle.

The formula: Bulking calories = TDEE + surplus

Don't know your TDEE? Calculate it for free here.

Pick your surplus

Muscle has a maximum growth rate — natural lifters can build maybe 0.5–1 lb of muscle per month at peak. Eating beyond what your body can use just gets stored as fat.

Lean bulk: TDEE + 200 to 300

Gains ~0.25–0.5 lb (0.1–0.25 kg) per week. Minimal fat gain, longer cut not needed afterward.

Best for: intermediate or advanced lifters who already have a base of muscle and want to add slowly without bloating up.

Standard bulk: TDEE + 400 to 500

Gains ~0.5–1 lb (0.25–0.5 kg) per week. Solid muscle growth with some fat gain.

Best for: beginners (whose growth rate is highest) and anyone willing to trade some fat gain for faster muscle gain.

Why "dirty bulks" don't work

Eating 1,000+ calories above TDEE doesn't double your muscle gain — it just adds 4–5 lb of fat for every 1 lb of muscle. The cleanup cut afterward will undo months of work.

Worked example

A 25-year-old male lifter, 165 lb (75 kg), 5'10" (178 cm), desk-based job + trains 4 days per week. We compute TDEE from his actual day:

BMR (Mifflin-St Jeor) ≈ 1,720 cal
Typical day: 8h sleep, 13h sedentary, 2h light walking, 1h gym
MET-hours: (8×1) + (13×1.3) + (2×3) + (1×6) = 36.9
PAL = 36.9 / 24 ≈ 1.54
TDEE = 1,720 × 1.54 ≈ 2,650 cal/day
Lean bulk target = 2,650 + 250 = 2,900 cal/day
Protein target = 165 × 0.85 = 140 g/day

FindTDEE calculates this from your real day instead of asking you to pick an activity bucket — more accurate, especially for lifters whose lifestyle doesn't fit a dropdown.

If you're not gaining, the surplus is too small

Most people who "can't gain" are eating less than they think. Track everything for two weeks. If the scale isn't moving up, add 200 calories per day. Repeat every 2–3 weeks until you're gaining 0.25–0.5% body weight per week.

Frequently asked questions

How big should my bulking surplus be?

200–300 calories above TDEE for a lean bulk (slow muscle gain, minimal fat). 400–500 for a standard bulk (faster gains, some fat). Beyond 500 you're mostly adding fat — muscle has a max growth rate that no amount of extra food beats.

How fast should I gain weight when bulking?

Aim for 0.25–0.5% body weight per week. For a 160 lb (73 kg) lifter that's roughly 0.5 lb (0.25 kg) per week. Faster than that means you're adding mostly fat, not muscle — natural lifters can build at most 0.5–1 lb of muscle per month.

Should I bulk if I'm not lean?

If you're above 15% body fat (men) or 25% (women), cut first. Bulking from a higher body fat percentage means worse muscle:fat ratios, weaker insulin sensitivity, and a longer cut later. Get to 12–15% (men) or 20–22% (women) before bulking.

Why am I not gaining muscle even in a surplus?

Three common reasons: (1) the surplus is too small or your TDEE estimate is off — recalculate after 4 weeks, (2) protein is too low — aim 0.8 g per lb body weight, (3) training stimulus is insufficient — you need progressive overload, not just food.

How long should a bulk last?

12–24 weeks for most people. End the bulk when body fat creeps past 15–18% (men) or 25–28% (women). Then cut for 8–12 weeks to bring it back down before the next bulk.

Calculate your TDEE first

Get your maintenance calories, then add your surplus. Free, no signup.

Calculate my TDEE