Calculate your basal metabolic rate with the Mifflin-St Jeor equation — the calories your body burns at complete rest — plus daily estimates for every activity level.
How BMR is calculated
Basal Metabolic Rate is the energy your body needs at complete rest for breathing, circulation and cell repair. This calculator uses the Mifflin-St Jeor equation, widely considered the most accurate formula for most adults.
BMR = 10×weight (kg) + 6.25×height (cm) − 5×age + s (s = +5 men, −161 women)Frequently asked questions
Why does BMR matter?
It is the base of your daily calorie needs. Multiply BMR by an activity factor to estimate total daily energy expenditure (TDEE), the starting point for weight goals. This is general information, not medical advice.
Can I eat below my BMR?
Prolonged intake below BMR is generally discouraged without medical supervision — it can slow metabolism and cause nutrient shortfalls. Prefer a moderate deficit from TDEE instead.
How accurate is the Mifflin-St Jeor equation?
For most adults it lands within about 10% of measured values. Body composition, genetics and health conditions shift real-world numbers, so treat it as an estimate.
Last updated: 7 July 2026
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For information only — not medical advice. HealthMint · MintKit