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Calorie Surplus Calculator (Lean Bulk)

Estimate a calorie surplus that supports muscle growth while limiting fat gain, based on your training experience.

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Estimated values

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What is it?

A calorie surplus provides extra energy for building new tissue. Beginners can build muscle faster and benefit from a slightly larger surplus; advanced lifters gain slowly and need less.

How it's calculated

Maintenance is estimated with Mifflin-St Jeor × activity factor.

Surplus: +15% (beginner), +10% (intermediate), +5% (advanced), capped at 700 kcal/day.

Realistic lean-gain ceilings: ~1.0, 0.5 and 0.25 kg per month respectively.

How we calculate · Last reviewed: September 1, 2026

How to interpret your result

If you gain much faster than the realistic rate, reduce calories by 100–200 kcal.

Pair the surplus with a structured resistance training plan — without training, extra calories mostly become fat.

Estimates for healthy adults. Not medical advice — talk to a qualified professional about your specific situation.

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Related guides

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Most active adults do well with 1.6–2.2 g of protein per kg of body weight per day. Less active people need less; people dieting or building muscle benefit from the upper range.

Progressive Overload: How to Keep Getting Stronger

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Your daily calorie needs depend on your body size, age, sex and how active you are. Calculators give a starting estimate; your weight trend over 2–3 weeks tells you whether to adjust.

Low-calorie recipes

Filling recipes with 350 kcal or less per serving.

High-protein recipes

Recipes with at least 20 g of protein per serving and 25%+ of calories from protein.

Fat-Loss Workout Plan (4 Days)

Strength training that preserves muscle while you are in a calorie deficit, with shorter rests to keep sessions to 45 minutes. Pair it with a calorie deficit for results.

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Frequently asked questions

Do I need a surplus to build muscle?

Beginners and people returning to training can build muscle near maintenance, but a small surplus makes it easier.

How much weight should I gain per month?

Roughly 0.25–1 kg depending on training experience.

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