BMR Calculator
Calculate your basal metabolic rate — the number of calories your body burns at complete rest.
For educational purposes only. Consult a healthcare provider for personalized advice.
Basal Metabolic Rate (BMR)
1,737 cal/day
Calories burned at complete rest (Mifflin-St Jeor)
How to use
- Select your sex and enter your age.
- Choose metric or imperial units and enter height and weight.
- See your BMR instantly using the Mifflin-St Jeor equation.
Formula (Mifflin-St Jeor)
Men: BMR = 10 × weight(kg) + 6.25 × height(cm) − 5 × age + 5.
Women: BMR = 10 × weight(kg) + 6.25 × height(cm) − 5 × age − 161.
Example
A 30-year-old man, 175 cm tall, 70 kg:
BMR ≈ 1,698 calories per day at rest.
Frequently asked questions
What is BMR?
Basal metabolic rate (BMR) is the number of calories your body needs to maintain basic functions at rest, such as breathing and circulation.
What is the difference between BMR and TDEE?
BMR is calories burned at rest. TDEE (total daily energy expenditure) includes BMR plus calories burned through daily activity and exercise.
How accurate is the Mifflin-St Jeor equation?
It is one of the most accurate BMR formulas for most adults, typically within 10% of measured resting metabolic rate.
Should I eat below my BMR to lose weight?
Generally, you should not eat below your BMR for extended periods. Use TDEE minus a moderate deficit (300–500 cal) for sustainable weight loss.
Does muscle mass affect BMR?
Yes. More lean muscle mass increases BMR because muscle tissue burns more calories at rest than fat tissue.
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