Calorie Deficit Calculator
with Daily Deficit & Weight Loss Targets

How a calorie deficit is estimated

A calorie deficit is created when target intake falls below estimated maintenance calories. This calculator first estimates maintenance calories using body size, age, sex, and activity level. It then subtracts a selected daily deficit amount to produce the target intake.

The weekly weight change estimate is derived from the total weekly calorie deficit. This is useful as a planning reference, but it should still be treated as an estimate rather than a guarantee.

Core structure

Why deficit speed changes the target

A smaller daily deficit keeps target intake closer to maintenance, while a larger daily deficit pushes target intake lower. That also changes the estimated weekly pace of weight loss. This is why deficit style is one of the most important inputs after maintenance.

Different users may prefer different pacing. Some prefer a slower change with a smaller reduction, while others may choose a stronger reduction. The calculator shows that difference directly in both calories and estimated weekly pace.

Example pace framework

Maintenance, deficit, and target intake are linked

Maintenance calories are the base estimate. The deficit is the reduction from that base, and target intake is what remains after the reduction is applied. This means all three values must be read together, not in isolation.

For example, a 500 calorie deficit means something different on a maintenance level of 2,800 calories than it does on 1,900 calories. That is why the target intake and the relative interpretation are shown alongside the deficit amount.

Frequently Asked Questions