BMR Calculator
Calculate your Basal Metabolic Rate with the trusted Mifflin-St Jeor equation, and see your estimated daily calorie burn at each activity level.
2026 rates · Last reviewed: 2026
What BMR is
Your Basal Metabolic Rate is the number of calories your body burns just to keep you alive at complete rest — powering your heart, brain, breathing and cell repair. For most people it's the largest single chunk of daily energy use.
The Mifflin-St Jeor equation
We use the Mifflin-St Jeor formula, which research has found to be among the most accurate for the general population:
BMR = 10 × weight(kg) + 6.25 × height(cm) − 5 × age + s
where s = +5 for males, −161 for females
From BMR to daily calories
BMR alone is too low to eat at, because you actually move during the day. Multiply it by an activity factor to get your TDEE — your real daily burn. The table above shows your BMR scaled across activity levels. For calorie targets toward a goal, use the calorie calculator.
Confused about which number to use? BMR vs TDEE explains it clearly.
Note
This is a general estimate, not medical advice. Individual metabolism varies, and the formula isn't suitable for children or during pregnancy. Speak with a healthcare professional for personalized guidance.
This calculator provides estimates for general information only and is not medical advice. See our disclaimer.