Health
Basal Metabolic Rate (BMR) estimates calories your body burns at rest to maintain vital functions. It is a starting point for total daily energy needs before activity multipliers.
Basal Metabolic Rate (BMR) estimates calories your body burns at rest to maintain vital functions. It is a starting point for total daily energy needs before activity multipliers.
The Mifflin-St Jeor equation is commonly used for adults and incorporates age, sex, height, and weight. Actual metabolism varies with genetics, hormones, and body composition.
Use BMR as a planning estimate, not a medical test. Consult professionals for clinical nutrition or metabolic disorders.
Provide age, sex, height, and weight. Calculate to see estimated BMR in calories per day using Mifflin-St Jeor.
This bmr calculator (mifflin-st jeor) applies the standard relationship below. Intermediate values are kept at full precision; only the displayed result is rounded.
Men: BMR = 10 x weight(kg) + 6.25 x height(cm) - 5 x age + 5; Women: BMR = 10 x weight(kg) + 6.25 x height(cm) - 5 x age - 161
For a 30-year-old man, 70 kg and 175 cm: BMR = 10 × 70 + 6.25 × 175 − 5 × 30 + 5 = 700 + 1093.75 − 150 + 5 = 1648.75, shown as about 1649 kcal/day. For a woman with the same figures the constant is −161 instead of +5, giving about 1483 kcal/day.
Mifflin-St Jeor, a widely cited adult BMR formula.
No. Total daily burn includes activity above BMR (see TDEE calculator).
No. Educational estimate only.
Yes.
The factors and formulas used by this tool follow these references:
Health and fitness results are estimates for general education and planning. They are not medical advice and do not replace an assessment by a doctor, registered dietitian, or other qualified professional.
Last reviewed: September 2026. Found an error? Tell us and we will correct it.
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