Health & Fitness
BMR Calculator
Mifflin–St Jeor: resting calories per day.
Educational estimates only. Not medical, legal, tax, or financial advice.
Guide: BMR Calculator
What it does
Approximates calories your body may burn at rest per day based on anthropometrics and sex, using the Mifflin–St Jeor equation.
How to use it
Fill in age, height, weight, and sex, then calculate. The result is an estimate in kcal/day at rest.
Formula
Men: BMR = 10×weight(kg) + 6.25×height(cm) − 5×age + 5. Women: 10×W + 6.25×H − 5×age − 161.
Example
A 30-year-old, 175 cm, 70 kg male → ~1,665 kcal/day BMR (rounded), before activity.
FAQs
Is BMR the same as my calorie target?
No. Total daily energy needs add activity (TDEE). BMR is only the resting component.
Why might my real metabolism differ?
Equations are averages. Medications, thyroid, lean mass, and genetics can shift actual needs.
Which units does this calculator expect?
Metric inputs as labeled in the form (kg, cm, years).