BMR Calculator

Estimate basal metabolic rate, the calories your body uses at rest before daily activity is added.

Preparing BMR Calculator

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Input

Choose the unit system, enter age, sex, height, and weight, and the calculator will estimate resting calorie needs. This tool shows the result instantly without step-by-step output.

Input summary

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How to use BMR Calculator

Provide the basic body measurements, and the calculator will estimate the calories your body would use in a resting state before exercise or daily movement is added.

What this calculator is for

This calculator is for understanding resting energy use and building toward calorie or TDEE planning. BMR is not the same as total daily calorie needs, because ordinary movement, exercise, and digestion all add to the full daily total.

Tips

Use BMR as a baseline, not as a full-day eating target unless a clinician has told you otherwise.
If your routine is active, compare this result with a TDEE estimate rather than relying on BMR alone.
Different equations can give slightly different values, so focus on the estimate as a planning range rather than a perfect fixed number.

Equation used

This calculator uses the Mifflin–St Jeor resting-energy equation, which is one of the most widely used adult BMR estimates.

Men: BMR = 10 × weight (kg) + 6.25 × height (cm) − 5 × age + 5.
Women: BMR = 10 × weight (kg) + 6.25 × height (cm) − 5 × age − 161.
The tool accepts metric or imperial input, then converts measurements to the units the equation expects.