BMR Calculator
The Mifflin-St Jeor equation estimates basal metabolic rate from weight, height, age and sex. It fits modern populations better than the older Harris-Benedict formula.
Your numbers
BMR
1,568kcal
TDEE
2,430kcal
Formula
BMR = 10×Weight (kg) + 6.25×Height (cm) − 5×Age + 5 (M) / −161 (F)
The second figure assumes moderate activity (factor 1.55) — adjust activity in the TDEE calculator.
What to enter
| Input | Default | Accepted range |
|---|---|---|
| Sex (M1 / F0)Where the formula splits by sex — enter 1 for male, 0 for female. | 1 | 0 ~ 1 |
| AgeAge in completed years — it shifts by one depending on the birthday. | 30 | 1 ~ 120 |
| Height (cm)Height in centimetres; converted to metres inside the formula. | 170 | 100 ~ 250 |
| Weight (kg)The second weight you are comparing against. | 65 | 10 ~ 300 |
Step by step
Quick reference table
Results when only Age changes and everything else stays put.
| Age | BMR (kcal) | TDEE (kcal) |
|---|---|---|
| 15 | 1,643 | 2,546 |
| 22.5 | 1,605 | 2,488 |
| 30 | 1,568 | 2,430 |
| 45 | 1,493 | 2,313 |
| 60 | 1,418 | 2,197 |
What each result means
| Result | At default values |
|---|---|
| BMR (kcal)The calories you burn in a day doing nothing at all. | 1,568 |
| TDEE (kcal)Daily calories burned once activity is included. | 2,430 |
Common mistakes
The second figure assumes moderate activity (factor 1.55) — adjust activity in the TDEE calculator.
Glossary
- Sex (M1 / F0)
- Where the formula splits by sex — enter 1 for male, 0 for female.
- Age
- Age in completed years — it shifts by one depending on the birthday.
- Height (cm)
- Height in centimetres; converted to metres inside the formula.
- Weight (kg)
- The second weight you are comparing against.
- BMR
- The calories you burn in a day doing nothing at all.
- TDEE
- Daily calories burned once activity is included.
Frequently asked questions
Q. How is BMR Calculator calculated?
BMR = 10×Weight (kg) + 6.25×Height (cm) − 5×Age + 5 (M) / −161 (F) — The Mifflin-St Jeor equation estimates basal metabolic rate from weight, height, age and sex. It fits modern populations better than the older Harris-Benedict formula.
Q. Can you walk through an example?
With Sex (M1 / F0) 1, Age 30, Height (cm) 170, Weight (kg) 65, the answer is BMR 1,568kcal.
Q. What do I need to enter?
Enter Sex (M1 / F0), Age, Height (cm), Weight (kg). The result recalculates as you type, and an empty box counts as zero.
Q. How much does the answer move if I change a number?
Changing only Age moves the answer to Age 15 → BMR (kcal) 1,643 and Age 60 → BMR (kcal) 1,418. The table below lays out five steps.
Q. How are the numbers rounded?
Money is shown to the nearest whole unit, percentages to one decimal place and everything else to two. What you see is rounded; the calculation itself carries the unrounded value forward.
Q. Anything to watch out for?
The second figure assumes moderate activity (factor 1.55) — adjust activity in the TDEE calculator.
Related calculators
These calculators help you understand health figures; they do not replace diagnosis or prescription. See a clinician if you have symptoms.