BMR Calculator
Basal Metabolic Rate (BMR) is the number of calories your body burns at complete rest just to keep basic functions running. This calculator uses the Mifflin-St Jeor equation, the formula most dietitians consider the modern standard, from your sex, age, height, and weight, then multiplies it by five activity-level factors to show your Total Daily Energy Expenditure (TDEE) — the calorie number most people actually use for weight loss or maintenance planning.
Educational estimate only. Results are not medical, legal, or financial advice. Confirm important decisions with a qualified professional.
How it works
- Choose your sex and enter age, height, and weight.
- The Mifflin-St Jeor formula computes your BMR.
- Read TDEE at five activity levels, from sedentary to very active.
Formula Men: BMR = 10×kg + 6.25×cm − 5×age + 5; Women: BMR = 10×kg + 6.25×cm − 5×age − 161; TDEE = BMR × activity factor
Frequently asked questions
What is BMR?
Basal Metabolic Rate is the calories your body burns at complete rest to sustain basic functions like breathing and circulation, before any activity is added.
How is BMR calculated?
This tool uses the Mifflin-St Jeor equation: 10×weight(kg) + 6.25×height(cm) − 5×age, plus 5 for men or minus 161 for women.
What is the difference between BMR and TDEE?
BMR is calories burned at rest. TDEE multiplies BMR by an activity factor to estimate total calories burned in a day, including exercise and daily movement.
Which activity level should I choose?
Sedentary means little or no exercise; light is 1-3 days/week; moderate is 3-5 days/week; active is 6-7 days/week; very active means hard daily training or a physical job.
Is Mifflin-St Jeor more accurate than Harris-Benedict?
Most nutrition research since the 1990s found Mifflin-St Jeor more accurate for modern populations, which is why it has replaced Harris-Benedict as the standard formula.