Why small surpluses win
Muscle protein synthesis has a speed limit. Beyond a modest surplus, extra calories don't become extra muscle — they become fat that a future cut has to remove. For most natural lifters past the beginner stage, +200–300 kcal/day supports close to maximal muscle gain (~0.25–0.5% of body weight per month) at a fraction of the fat cost of old-school bulking.
The other two-thirds of the equation
- Protein: 1.8–2.2 g/kg daily — the calculator shows your range, or use the dedicated protein calculator.
- Progressive training: a surplus without progressive overload is just a weight-gain plan.
- Patience: verify with the scale's monthly trend; gaining faster than ~0.5% body weight/month past the beginner stage usually means gaining fat.
Frequently asked questions
How many calories should I eat to bulk?
TDEE plus 200–300 kcal covers most lifters — typically 2,700–3,300 kcal for men and 2,200–2,700 for women, depending on size and training volume. The calculator personalizes it.
Can I build muscle without a surplus?
Beginners, returning lifters and people with higher body fat often can ('recomposition'). Trained, lean lifters generally need at least a small surplus for meaningful gains.
How fast should I gain on a bulk?
Roughly 0.25–0.5% of body weight per month for experienced lifters, up to ~1% for beginners. Faster than that and the extra is mostly fat.
More calculators
TDEE Calculator
Work out your Total Daily Energy Expenditure
Calorie Calculator
Get a daily calorie target matched to your goal
BMR Calculator
Estimate the calories your body burns at complete rest, compared across the three standard equations
Calorie Deficit Calculator
Choose a weekly weight-loss rate and see the exact daily calories that achieve it
Macro Calculator
Split your daily calories into protein, carbs and fat
Maintenance Calorie Calculator
Find the daily calories that keep your weight stable
Sources
- Morton RW, Murphy KT, McKellar SR, et al. A systematic review, meta-analysis and meta-regression of the effect of protein supplementation on resistance training-induced gains in muscle mass and strength. Br J Sports Med. 2018. [link]
- Helms ER, Aragon AA, Fitschen PJ. Evidence-based recommendations for natural bodybuilding contest preparation: nutrition and supplementation. J Int Soc Sports Nutr. 2014. [link]