BMR calculator
HealthEstimate basal metabolic rate from age, gender, weight and height using the Mifflin-St Jeor equation.
Your results
Estimate the calories your body burns at complete rest.
How BMR is estimated
We use the Mifflin-St Jeor equation: 10·weight + 6.25·height - 5·age, plus a gender adjustment. It is one of the most accurate formulas for healthy adults.
BMR vs TDEE
BMR is what you burn at rest. TDEE adds daily activity on top. To estimate maintenance calories, multiply BMR by your activity factor.
Frequently asked questions
Answers to the most common questions about this tool.
How is this result calculated?
It uses the method and inputs described on this page to provide an informational estimate.
How accurate is the result?
It is an estimate and should be interpreted as a guide, not an exact measurement.
When should I seek professional advice?
Seek qualified advice for symptoms, pregnancy, illness, medication use, or clinical decisions.
What information do I need to enter?
Enter current, accurate details and select the correct units before calculating.
What can affect this estimate?
Individual factors such as health, activity, body composition, and measurement technique can affect it.
Sources and methodology
Methodology: Basal metabolic rate
Applies Mifflin–St Jeor with weight, height, age, and sex to estimate resting energy.
It does not by itself estimate total daily energy expenditure.
Last reviewed
July 15, 2026