Estimate adult basal metabolic rate in kcal/day with the Mifflin–St Jeor equation using metric or imperial height and weight.
01 / ADULT MEASUREMENTS
Enter adult measurements to estimate energy used at rest—not how many calories you should eat.
02 / ESTIMATE
Enter your measurements and calculate to see an estimate.
03 / FORMULA & ASSUMPTIONS
BMR ≈ 10 × weight (kg) + 6.25 × height (cm) − 5 × age (years) + coefficient. The published sex coefficients are +5 for male and −161 for female.
Imperial measurements use 1 inch = 2.54 cm and 1 lb = 0.45359237 kg. Supported input ranges are 18–120 years, 80–275 cm and 20–500 kg; accepting a value does not establish the equation's accuracy for that individual.
This is an adult resting-energy estimate, not a measurement, diagnosis or personalized medical advice. The equation's sex parameter is not a gender-identity assessment. It does not account for activity, pregnancy, lactation, body composition or individual medical circumstances, and it does not recommend daily calorie intake.
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Choose metric or imperial units, enter adult age, height and weight, and select the published equation's sex parameter. Calculate BMR and review its assumptions.
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The Mifflin–St Jeor equation: 10 × weight in kg + 6.25 × height in cm − 5 × age in years + a coefficient of +5 for male or −161 for female.
Yes. Imperial measurements use exact conversion factors of 2.54 cm per inch and 0.45359237 kg per pound before applying the equation.
No. It estimates basal energy expenditure, without activity multipliers, food recommendations or weight-loss targets.
Whole-number adult ages from 18 to 120, height from 80 to 275 cm and weight from 20 to 500 kg, including imperial equivalents. Input acceptance is not evidence of individual accuracy.
It selects one of the two published equation coefficients. It is not a gender-identity assessment and does not account for individual body composition or medical circumstances.
No. This is an approximate adult resting-energy calculation, not a measurement, diagnosis or personalized recommendation. Pregnancy, lactation, activity and medical conditions are not modeled.