BMR Calculator
Enter your sex, age, height, and weight to calculate your basal metabolic rate (BMR) and daily calorie expenditure (TDEE) by activity level using the Mifflin-St Jeor formula. All calculations happen inside your browser.
yrs
cm
kg
Enter your details to see the results.
0
BMR (kcal)
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Lightly active (1–3×/week)
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Moderately active (3–5×/week)
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Very active (6–7×/week)
How to use
- Select your sex.
- Enter your age, height (cm), and weight (kg).
- The BMR and daily calorie expenditure by activity level are shown in real time.
Frequently asked questions
What is basal metabolic rate (BMR)?
The basal metabolic rate is the minimum energy needed to sustain life at complete rest. This calculator estimates it with the Mifflin-St Jeor formula.
How is TDEE calculated?
The daily calories you actually burn are estimated by multiplying the BMR by an activity-level factor. The more active you are, the larger the factor.
Is the information I enter sent to a server?
No. All calculations happen only inside your browser, and the information you enter is never sent to or stored on any server.