Estimate basal metabolic rate with the Mifflin-St Jeor equation and scale it to total daily energy expenditure with the standard activity factors. Runs entirely in your browser — your numbers never leave this device.
| Activity | Factor | kcal/day |
|---|---|---|
| Sedentary (little or no exercise) | 1.2 | 2,136 |
| Lightly active (1-3 days/week) | 1.38 | 2,448 |
| Moderately active (3-5 days/week) | 1.55 | 2,759 |
| Very active (6-7 days/week) | 1.73 | 3,071 |
| Extra active (physical job + training) | 1.9 | 3,382 |
Informational only. This calculator applies a published formula to the numbers you enter — it is not medical advice, a diagnosis, or a substitute for a clinician. Talk to a qualified professional about decisions concerning your health.
| Activity level | Factor |
|---|---|
| Sedentary | 1.2 |
| Lightly active | 1.375 |
| Moderately active | 1.55 |
| Very active | 1.725 |
| Extra active | 1.9 |
Basal metabolic rate is the energy figure the Mifflin-St Jeor equation estimates from weight, height, age and sex. The equation was published in 1990 and is the most widely used predictive formula for resting energy expenditure: ten times weight in kilograms, plus 6.25 times height in centimetres, minus five times age in years, then plus 5 for men or minus 161 for women. Every constant is printed in the formula above so the arithmetic can be reproduced by hand.
Total daily energy expenditure scales that resting figure by an activity factor. The five standard multipliers — 1.2 for sedentary through 1.9 for extra active — are listed in the table on this page. Multiplying BMR by the chosen factor gives TDEE, the estimated total for a day at that activity level. The result is an estimate from a population equation: measured values for individuals vary around any predictive formula, and the page presents the figure as arithmetic, not as a prescription.
This tool is informational only. It computes BMR and TDEE from the published equation and factors, and it does not recommend an intake level for any person.
It is the predictive equation most commonly used in current practice and the one validated against the widest range of adults. The formula and its constants are printed on this page so the choice is visible and the result can be checked.
BMR is the resting figure from the equation alone. TDEE is BMR multiplied by an activity factor from the table — 1.2, 1.375, 1.55, 1.725 or 1.9 — to estimate a full day at that activity level.
Predictive equations estimate a population average for the given weight, height, age and sex. An individual's measured expenditure can differ. The page shows the formula's output; it does not claim a measured value.
No. The calculator returns the output of a published equation for information only. It does not set a target intake for any person. Decisions about diet belong with a qualified professional.
No. Everything runs in the browser. Weight, height and age are never uploaded, stored or tracked.
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