Calculate Basal Metabolic Rate
Estimate the calories your body burns at rest, using the Mifflin-St Jeor equation.
BMR is the Mifflin-St Jeor estimate of the calories your body burns at complete rest. It doesn't include any activity. Use the Calorie Needs Calculator to factor in your activity level.
Metric or imperial units. The Mifflin-St Jeor equation needs all four.
An estimate of the calories your body burns at complete rest.
Combine it with an activity level in the Calorie Needs Calculator for your full daily target.
Frequently asked
What is BMR?
Basal Metabolic Rate is roughly how many calories your body burns just to keep essential functions running (breathing, circulation, cell repair). Before any activity or exercise is counted.
Why does the calculator ask for sex?
The Mifflin-St Jeor equation used here is sex-specific by formula design (there isn't a published gender-neutral variant) so it's required to compute an accurate estimate, not for any other purpose.
Why does BMR differ from other calculators I've used?
Several BMR formulas exist (Mifflin-St Jeor, Harris-Benedict, Katch-McArdle). This tool uses Mifflin-St Jeor, generally considered the most accurate for the modern population. Other tools using a different formula will give slightly different numbers.
Is this medical advice?
No. It's a mathematical estimate for general informational purposes only, not medical advice. Consult a healthcare provider or dietitian for personalized guidance.