Find out exactly how many calories you need to gain muscle. Science-backed surplus targets, TDEE calculation, and a step-by-step guide for all goals.
Frequently Asked Questions
How many extra calories do I need to build muscle?
Most people need 200–500 extra calories above their Total Daily Energy Expenditure (TDEE) to support muscle growth. Research shows that a 10–20% surplus is optimal — larger surpluses increase fat gain without meaningfully speeding up muscle growth.
Can I build muscle without eating more calories?
Yes, in certain situations. Beginners, people returning after a training break, and those with higher body fat can often build muscle at or near maintenance — a process called body recomposition. For most trained individuals, a calorie surplus significantly improves the rate of muscle gain.
How many calories should a woman eat to gain muscle?
Women generally need a smaller absolute surplus than men — typically 150–300 extra calories above TDEE — due to lower average lean mass and slower absolute muscle gain rates. The same 10–20% surplus principle applies; the numbers are just smaller.
How do I calculate TDEE for muscle gain?
Calculate your Basal Metabolic Rate using the Mifflin-St Jeor equation, then multiply by an activity factor (1.2 for sedentary, 1.55 for moderately active, 1.725 for very active). Add 200–500 calories to this number to create a muscle-building surplus.
What is the best calorie surplus for lean bulking?
A surplus of 200–350 calories produces nearly identical muscle gains to a 500+ calorie surplus but with significantly less fat gain, according to a 2023 randomized controlled trial in Sports Medicine - Open. Start conservatively and increase only if weight gain stalls for two weeks.