BMR Calculator
Estimate the calories your body burns at rest, using the Mifflin–St Jeor equation.
Runs in your browser — nothing is uploadedEnter values
Units
Sex
Result
- Harris–Benedict (revised)
- 1,696 kcal
- Sedentary (×1.2)
- 1,979 kcal
- Lightly active (×1.375)
- 2,267 kcal
- Moderately active (×1.55)
- 2,556 kcal
- Very active (×1.725)
- 2,844 kcal
- Extra active (×1.9)
- 3,133 kcal
How it's calculated
BMR = 10 × weight(kg) + 6.25 × height(cm) − 5 × age + 5
= 10 × 70 + 6.25 × 175 − 5 × 30 + 5 = 1,649 kcal
BMR is the energy your body uses at complete rest. Activity rows show estimated daily needs (TDEE).
About BMR Calculator
Basal Metabolic Rate (BMR) is the number of calories your body uses at complete rest to keep you alive — breathing, circulation, temperature and cell repair. It usually accounts for the largest share of the calories you burn each day.
This calculator estimates BMR with the Mifflin–St Jeor equation, considered one of the most accurate formulas for most adults, and shows estimated daily calorie needs for different activity levels.
When to use it
- Planning a diet for weight loss, maintenance or muscle gain.
- Understanding your baseline calorie needs.
- Setting calorie targets in fitness apps.
- Nutrition and fitness coaching.
Tips for better results
- Choose your activity level honestly — overestimating it is the most common mistake.
- Recalculate after significant weight changes, since BMR changes with weight.
- Use the Calorie Calculator to set goal-based daily targets.
How to use the BMR Calculator
- Choose your units and sex.
- Enter your age, weight and height.
- See your BMR and estimated daily needs by activity level.
Frequently asked questions
What is BMR?
Basal Metabolic Rate is the energy your body needs at complete rest to keep basic functions such as breathing and circulation running.
Which formula is used?
Mifflin–St Jeor, which studies show is the most accurate of the common equations for most adults. The revised Harris–Benedict result is shown for comparison.
What affects BMR?
Age, sex, weight, height and muscle mass have the biggest effect. More muscle raises BMR; BMR usually declines gradually with age.
What is the difference between BMR and TDEE?
BMR is the calories burned at rest. TDEE (total daily energy expenditure) adds activity and digestion on top — it is BMR multiplied by an activity factor.