BMR calculator (Mifflin-St Jeor)
Mifflin-St Jeor is the equation many dietitians rely on to estimate resting energy use in adults.
Loading the tool…
Processing and privacy: The result is calculated inside your browser and your data is not sent to any server.
How to use it
- Enter sex, age, weight and height.
- The result appears straight away and updates as you edit.
- Copy the result, or copy a link that keeps the same values to share it.
How it is calculated
Men: BMR = 10 × weight (kg) + 6.25 × height (cm) − 5 × age + 5. Women: the same with − 161 instead of + 5.
Example
Inputs: Sex = Male, Age = 30 years, Weight = 70 kg, Height = 175 cm. Result: BMR: 1,649 kcal/day; In kilojoules: 6,898 kJ/day; Per hour: 68.7 kcal/hour.
Limits and caveats
- It is a statistical estimate and can be about 10% off a lab measurement for some people.
- Adults only; not for pregnancy or conditions that change metabolism.
Questions about this tool
What is the difference between BMR and TDEE?
BMR is what you burn at complete rest; TDEE adds your daily activity and equals BMR times an activity factor.
Why is Mifflin-St Jeor preferred over Harris-Benedict?
It was built on newer data from 1990, and comparison studies found it closer to measured values for most adults.
Should I eat below my BMR to lose weight?
Not without medical supervision. A calorie deficit is usually set from TDEE, not BMR.