Supporting calculator

REE Calculator

REE means resting energy expenditure: the energy your body uses at rest. Calculate yours below and see how much of your total daily burn it accounts for.

Calculate My REESee maintenance calories

Calculate your REE

Estimates resting energy expenditure with the Mifflin-St Jeor equation, then shows how activity turns REE into your total daily burn. For adults.

Sex
Height
Weight

Activity level only affects the TDEE comparison. Your REE itself does not change with activity.

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What is REE?

Resting energy expenditure is the energy your body uses for essential functions like breathing, circulation, body temperature, and cell repair while at rest.

REE is closely related to BMR. In everyday calorie calculators, the terms are often used near each other because both describe the resting baseline before activity is added.

For the deeper walkthrough — where those resting calories actually go, a reference table by age and weight, and how BMR differs from RMR — read our BMR calculator guide.

REE vs TDEE

  • REE is the resting baseline.
  • BMR is a similar basal estimate used by many equations.
  • TDEE adds activity, exercise, and movement.
  • Daily calorie targets usually start with BMR or REE, then apply an activity multiplier.

Why this matters for tracking

If REE is the foundation, your daily routine is the multiplier, which is why the calculator above shows both. Coach Ivy helps you test the estimate by tracking meals and progress consistently.

Frequently asked questions

What is REE?

REE means resting energy expenditure: the calories your body uses at rest for breathing, circulation, body temperature, and cell repair. It is the largest single component of daily calorie burn for most people.

Is REE the same as BMR?

They are very close and are often used interchangeably. BMR is measured under stricter conditions, so REE typically comes out slightly higher, usually by a few percent. Most calculators, including this one, use a BMR equation to estimate REE.

How is REE calculated?

This calculator uses the Mifflin-St Jeor equation: 10 x weight in kg + 6.25 x height in cm - 5 x age, then +5 for men and -161 for women.

What percentage of TDEE is REE?

REE is usually around 60 to 75 percent of total daily energy expenditure. The exact share depends on your activity multiplier: the more active you are, the smaller the resting share becomes.