Math calculator
BMR Calculator
Estimate basal metabolic rate using the Mifflin–St Jeor equation for adults.
Health information only: this is a general estimate for adults, not medical advice or a personalized nutrition plan. Energy needs vary; consult a qualified health professional for individual guidance.
How this calculation works
Mifflin–St Jeor: men 10w + 6.25h − 5a + 5; women 10w + 6.25h − 5a − 161 (kg, cm, years). Use the calculator above to enter your values. Inputs are checked before a result is shown, and calculations run locally in your browser.
Male, 30 years, 70 kg, 175 cm: 1,648.75 kcal/day.
Female, 30 years, 60 kg, 165 cm: 1,320.25 kcal/day.
Male, 40 years, 80 kg, 180 cm: 1,730 kcal/day.
Formula source: Mifflin et al., American Journal of Clinical Nutrition (1990). The equation estimates resting energy expenditure; activity multipliers are rough estimates.
Frequently asked questions
How does the bmr calculator work?
Mifflin–St Jeor: men 10w + 6.25h − 5a + 5; women 10w + 6.25h − 5a − 161 (kg, cm, years).
What is an example?
For a 30-year-old, 70 kg, 175 cm man: 10(70) + 6.25(175) − 5(30) + 5 = 1,648.75 kcal/day.
Can I enter decimal values?
Yes. Enter decimal values where appropriate. The calculator checks required inputs and displays a readable result.
Are results rounded?
Results are formatted for readability. Check the displayed formula and units when using the result.
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