BMR Calculator
Last updated: October 15, 2026
Estimate basal metabolic rate using the Mifflin-St Jeor equation.
Estimated BMR
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- Calories per week at BMR: —
- Formula used: —
On this page
Quick summary: Estimate basal metabolic rate using the Mifflin-St Jeor equation.
Read the method, example and limitations
Updated reference sections in this guide are in English.
Guide language: English. Updated October 15, 2026.
What this calculator estimates
The BMR Calculator estimates basal metabolic rate, the amount of energy the body would use over a day at rest to support functions such as breathing, circulation, temperature regulation, and basic cellular activity.
Inputs and units
Enter Sex, Age, Weight (lb), Height (in). Use the units shown. Enter positive adult measurements in the stated units. Zero does not stand for a missing measurement. Select Calculate after changing the values.
Method and assumptions
The input form uses pounds and inches, converted to kg with 0.45359237 kg/lb and to cm with 2.54 cm/in. Apply the Mifflin-St Jeor resting-energy equation: 10 x kg + 6.25 x cm - 5 x age + 5 for the male equation, or -161 for the female equation.
Worked example
At age 35, 180 lb and 70 in using the male equation, resting energy is approximately 1,757.72 kcal/day, displayed as 1,758. Weekly energy is seven times the unrounded estimate.
Limitations
Despite the familiar BMR name, the equation predicts resting energy expenditure. It is an estimate for adults, not a measured metabolic test or a pediatric calculation. The original study used healthy adults aged 19 to 78.