Calorie Surplus Calculator
Results are estimates only and may not reflect your individual needs. This tool is for educational purposes only and is not medical advice.
Calculate your daily calorie target for muscle gain based on your TDEE and bulk pace.
Your result will appear here
Complete the form and press Calculate Surplus.
Estimated result
These estimates are for educational purposes only and are not medical advice.
Why use this calculator
To build muscle, you need to eat more than you burn — but how much more matters. Too large a surplus means unnecessary fat gain; too small a surplus limits the rate of muscle growth. This calculator helps you find the minimum effective surplus for lean muscle gain.
How to use this calculator
Enter your details and activity level, then choose your bulking pace: lean (+0.25 kg/week), moderate (+0.5 kg/week), or aggressive (+0.75 kg/week). Press Calculate to see your daily calorie target and surplus.
What the result means
A surplus of 275 kcal/day targets roughly 0.25 kg/week of weight gain; 550 kcal/day targets 0.5 kg/week; 825 kcal/day targets 0.75 kg/week. The proportion of that gain that is muscle versus fat depends on training quality, sleep, and protein intake.
Important limitations
Larger surpluses produce faster weight gain but a higher proportion of fat gain. Most natural lifters maximise muscle gain at a lean or moderate pace.
FAQ
How much of the weight gained will be muscle?
For natural lifters, roughly 50% of surplus weight gain is muscle mass under good conditions (progressive training, adequate protein, quality sleep).
Should I bulk or cut first?
If body fat is above ~18% for men or ~28% for women, cutting first is generally recommended.
Why do I need to enter my age?
Age affects metabolic rate and body composition. The formulas used here are validated for adults (18+). Child and teen calculations require different growth-adjusted reference ranges not covered by this tool.
These estimates are for educational purposes only and are not medical advice. They are not intended for children, teens, pregnancy, eating disorder recovery, or medical conditions.