How big should a bulking surplus be?

For most trained lifters 125-250 calories a day is enough. Larger surpluses speed up weight gain but not muscle gain.

Can I gain muscle without a surplus?

Beginners, people returning from a break and those with higher body fat often can. Experienced lifters usually need at least a small surplus.

How much protein do I need in a surplus?

Around 1.6-2.2 g per kg of body weight per day is the commonly cited range for supporting muscle gain.

Why is the scale jumping when I start a surplus?

Extra food means extra glycogen and water, which can add several pounds in the first week without any fat gain.

Calorie Surplus Calculator

Set an intake for controlled weight or muscle gain without an oversized surplus.

Enter your details and your result will appear here.

What Is Calorie Surplus?

A calorie surplus means eating more energy than you use, which is what allows body weight, and with training, muscle, to increase. This calculator sizes the surplus to the rate of gain you choose rather than defaulting to a large one.

Understanding Your Calorie Surplus Result

How the surplus is used depends on training and protein, not on the surplus itself. Resistance training and adequate protein direct more of the extra energy toward lean tissue; beyond a modest surplus, the remainder is stored as fat. Trained lifters gain lean mass slowly, which is why a 125-250 calorie surplus is usually enough.

How Is Calorie Surplus Calculated?

Target intake = TDEE + surplus (125 to 500 calories)

Methodology

Maintenance is estimated with Mifflin-St Jeor and an activity factor, then a surplus of 125, 250 or 500 calories a day is added, corresponding to roughly 0.25, 0.5 and 1 lb of weight gain per week.

Worked Example

A 24-year-old man who is 5 ft 11 in and 165 lb, very active, has a maintenance of about 2,940 calories. A steady-gain surplus of 250 calories gives a target of about 3,190 calories a day, or 1,750 extra calories a week.

Important Limitations

Rate of gain says nothing about composition; only body-weight change is predicted here. Beginners can gain lean mass faster than experienced lifters, and the 3,500-calorie-per-pound approximation is a rough guide. Rapid gain is mostly fat for most people.

Frequently Asked Questions

How big should a bulking surplus be?: For most trained lifters 125-250 calories a day is enough. Larger surpluses speed up weight gain but not muscle gain.
Can I gain muscle without a surplus?: Beginners, people returning from a break and those with higher body fat often can. Experienced lifters usually need at least a small surplus.
How much protein do I need in a surplus?: Around 1.6-2.2 g per kg of body weight per day is the commonly cited range for supporting muscle gain.
Why is the scale jumping when I start a surplus?: Extra food means extra glycogen and water, which can add several pounds in the first week without any fat gain.