Muscle Building Calculator

Focus Fuel Fire Calorie Surplus Calculator

This calculator is for building muscle and gaining lean mass. See exactly how big a surplus you need to grow at your target rate — plus a 6-month projection of where you'll be if you stay consistent.

Your numbers

Your surplus plan

Enter your numbers to see your daily calorie target and a 6-month gain projection.

Daily Calorie Target
- cal/day
to gain at your chosen pace
TDEE (Total Burn)
- cal
Daily Surplus
- cal
If you stay consistent
1 Month
-
lbs gained
3 Months
-
lbs gained
6 Months
-
lbs gained
-
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The Math

How the surplus math works.

Three steps from your numbers to your daily calorie target.

Step 01

Calculate your TDEE

Mifflin-St Jeor BMR times your activity factor. That's how many calories your body burns in an average day.

Step 02

Apply the surplus math

To gain ~1 lb/week, you need a 500 cal/day surplus. Your body uses the extra energy for muscle repair and growth.

Step 03

Add to TDEE

Your daily intake target = TDEE + daily surplus. Hit it consistently with quality food and the chart above is your future.

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