How Many Calories to Bulk: A No-Bullshit Guide

When people search “how many calories to bulk,” they expect a single number. There isn’t one - but the formula is simple and the answer is almost always lower than you think.

The short answer

Your bulk calorie target = your maintenance calories + 250 to 500.

That’s it. Anything higher and you’re bulking with mostly fat. Anything lower and the scale won’t move.

How to find your maintenance

Use Mifflin-St Jeor to get a starting estimate, then calibrate over 14 days. (See our calorie surplus calculator post for the full formula and protocol.)

Typical results for the founder demographic:

• 65kg male, 178cm, 27y, moderately active: ~2,500 maintenance → 2,750-3,000 bulk
• 70kg male, 180cm, 25y, very active: ~2,800 maintenance → 3,050-3,300 bulk
• 60kg female, 165cm, 28y, moderately active: ~1,950 maintenance → 2,200-2,450 bulk

Why “eat 5,000 calories” is bad advice

Old-school bodybuilding forums love telling skinny guys to eat 5,000 calories a day. This works in the sense that you’ll gain weight - but it’s 70% fat. Then you need a 6-month cut to lose it. You ended up exactly where you started, just with a year wasted.

Lean bulk pace is +0.25-0.5kg per month. Anything faster is mostly fat for non-beginners. For first-year lifters (true beginner gains), you can go +0.75kg per month with surplus closer to +500.

The check that matters

Hit your bulk number for 30 days. Weigh yourself daily. Use the 7-day rolling average. If you gained 0.25-0.5kg in 30 days, you’re dialed in. If you gained less, add 150 cal/day. If more, you’re bulking dirty - subtract 150.

klyo runs this calibration automatically every 14 days, so you never have to think about adjusting.