Calculator · Performance Lab
Lean Bulk Calculator
Controlled muscle-building surplus — grow without unnecessary fat.
Ergebnis
- TDEE
- 2,720kcal/day
- Target calories (lean bulk)
- 2,992kcal/day
- Recommended gain
- 0.15–0.26kg/week
- Recommended protein
- 150g/day
10 % surplus, +272 kcal/day.
Range based on experience level and body weight.
~2.0 g/kg.
If you gain noticeably faster than the target range, your surplus is too large — you're adding disproportionate fat. Adjust in 100 kcal steps.
Explained
What this calculator does for you
A lean bulk is the antithesis of the classic 'dirty bulk'. Instead of a large surplus that mainly adds fat, you pick a moderate surplus and let muscle grow under control over months.
We size the surplus by training experience: beginners benefit from a bit more energy (+15 %), intermediates less (+10 %), advanced lifters very little (+7 %). The rate of possible growth simply slows with the years.
The honest indicator is the scale over 3–4 weeks plus the mirror. If your gain exceeds the recommended range, your surplus is too big.
Science
Scientific background
Models like Lyle McDonald's and data from Helms et al. (2014) suggest beginners can add 0.25–0.5 %/week of body weight as muscle, intermediates 0.2–0.35 %, advanced lifters 0.1–0.25 %.
Larger surpluses increase the fat share of the gain, not muscle protein synthesis. The latter responds mainly to the training stimulus and protein intake.
A moderate surplus + ~2.0 g/kg protein + progressive strength training gives the best muscle-to-fat ratio.
Examples
Practical examples
Intermediate, 75 kg
TDEE ≈ 2,700 kcal → target ~2,970 kcal/day. Gain 0.15–0.26 kg/week, ~150 g protein.
Beginner, 70 kg
TDEE ≈ 2,600 kcal → target ~2,990 kcal/day. Gain 0.18–0.35 kg/week, ~140 g protein.
Avoid these
Common mistakes
- 01Too large a surplus out of impatience — result: fat, not muscle.
- 02No hard progression in training. Without stimulus the extra food becomes fat.
- 03Phases too short. A lean bulk takes months to show.
- 04Over-reading single weigh-ins instead of using the weekly average.
Recommendations
Further recommendations
- 01Plan a 3–5 month phase and work with a 7-day weight average.
- 02Keep protein at ~2.0 g/kg, fat at least 0.8 g/kg, the rest as carbs.
- 03Progressive overload: more reps or more weight across the weeks.
- 04Adjust monthly, not weekly.
FAQ
Frequently asked questions
- How fast should I gain?
- Aim for the lower half of the displayed range. Faster usually means: more fat, less muscle per kilo.
- What if I'm not gaining?
- Wait two to three weeks. If nothing moves, add 100–150 kcal/day and observe.
- Do I need cardio during a lean bulk?
- Some endurance (2–3 × 20–30 min) protects cardiovascular health and appetite. Don't overdo it — the surplus is for building.
- How long should a lean-bulk phase last?
- Typically 12–20 weeks. Then a mini-cut or maintenance for a few weeks, then build again.
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Protein Calculator
How much protein do you actually need — for maintenance, growth or a cut? Evidence-based ranges.
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Goal Weight Calculator
Sensible goal weight from a target body-fat percentage — more meaningful than BMI.
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Translates your desired pace into the required daily calorie delta — and rates it honestly.
Knowledge Hub
More on this in the Knowledge Hub
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