Nutrition Tool

Calorie Surplus Calculator

Estimate maintenance calories and choose a realistic calorie surplus for muscle gain or gradual weight gain. The goal is growth, not turning every meal into a competitive eating event.

General estimate for healthy adults. Speak with a clinician or dietitian before making major changes if you are underweight without knowing why, have digestive issues, diabetes medication, an eating disorder history or another medical condition affecting weight.

Your Target

Daily Calorie Estimate

Calorie Target
— Estimated Maintenance
— Daily Calorie Target
— Daily Surplus
— Rough Weekly Change
Add your details to calculate a practical starting target.

Surplus Guide

Small surplus — around 200 kcal/day Often useful for leaner, slower muscle gain with less chance of putting on unnecessary body fat.
Moderate surplus — around 300–500 kcal/day A practical middle ground for many people trying to gain muscle or body weight gradually.
High surplus — around 700 kcal/day May be useful in specific situations, but it can outpace muscle gain and add body fat faster than expected.

How To Use The Number

Treat it as a starting point.
Watch weight trends, gym performance, appetite and recovery over two to three weeks, then adjust slowly if needed.
Train with a plan.
A calorie surplus is far more useful when paired with regular resistance training and enough protein, rather than just more snacks.
Gain gradually.
Faster weight gain is not automatically better. A slower controlled increase is usually easier to manage and review.

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