Health & Fitness
BMR Calculator
Use this BMR calculator to estimate calories your body uses at rest before adding activity.
BMR
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- Calories per hour
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Student quick launch
Grade planning, algebra checks, and formulas students reach for most.
Study path
Use this calculator with
Follow these when you want the formula behind the answer, a short lesson, or nearby tools in the same topic.
What the bmr calculator solves
Use this BMR calculator to estimate calories your body uses at rest before adding activity.
Formula
How to use it
- Enter age, height, and weight.
- Choose the formula sex term.
- Read resting calories per day.
How to read the answer
BMR estimates baseline energy use at rest, not full daily calorie needs.
Common mistakes and edge cases
- BMR is lower than TDEE.
- Body composition can change real resting metabolism.
- Use clinical measurement for higher precision.
Worked examples
Male formula
BMR
1,768
Female formula
BMR
1,345
Frequently asked questions
Is BMR the calories I should eat?+
Usually no. Daily needs include activity, so TDEE is more useful for intake planning.
Which formula does this use?+
It uses Mifflin-St Jeor, a common modern estimate.
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Last updated: May 8, 2026