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BMR Calculator (Mifflin-St Jeor)
Quick answer
If sex is male, weight is 70 kg, height is 170 cm and age is 30 years, the estimated BMR is 1,618 kcal/day.
Mifflin–St Jeor equation: Men: BMR = 10 × weight (kg) + 6.25 × height (cm) − 5 × age + 5; Women: BMR = 10 × weight (kg) + 6.25 × height (cm) − 5 × age − 161.
Enter your values
Sex
30 kg200 kg
kg
100 cm220 cm
cm
15 years100 years
years
Estimated BMR
1,618kcal/day
Basal Metabolic Rate — roughly how many calories your body burns at complete rest just to keep functioning.
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About the BMR Calculator (Mifflin-St Jeor)
Your basal metabolic rate (BMR) is the energy your body uses at complete rest to breathe, circulate blood and keep cells working. The Mifflin–St Jeor equation estimates it from your sex, weight, height and age and is widely used by dietitians.
Multiply BMR by an activity factor to estimate how many calories you burn in a day (see the TDEE calculator).
Mifflin–St Jeor equation
Men: BMR = 10 × weight (kg) + 6.25 × height (cm) − 5 × age + 5
Women: BMR = 10 × weight (kg) + 6.25 × height (cm) − 5 × age − 161
Things to keep in mind
- The result is an estimate; real metabolism varies from person to person.
- BMR is not a calorie target on its own — most people need more once daily activity is included.
- Do not eat below the minimum levels recommended by your doctor or dietitian.
See how the result changes
Each table re-runs this calculator with one value changed and everything else left as it is.
Estimated BMR by sex
Switching sex from male to female changes estimated BMR from 1,618 kcal/day to 1,452 kcal/day (−10%).
| Sex | Estimated BMR |
|---|---|
| malestart | 1,618 kcal/day |
| female | 1,452 kcal/day |
Estimated BMR by weight
If weight goes from 70 kg to 105 kg, estimated BMR changes from 1,618 kcal/day to 1,968 kcal/day (+22%).
| Weight | Estimated BMR |
|---|---|
| 35 kg | 1,268 kcal/day |
| 52.5 kg | 1,443 kcal/day |
| 70 kgstart | 1,618 kcal/day |
| 105 kg | 1,968 kcal/day |
| 140 kg | 2,318 kcal/day |
Estimated BMR by height
If height goes from 170 cm to 255 cm, estimated BMR changes from 1,618 kcal/day to 2,149 kcal/day (+33%).
| Height | Estimated BMR |
|---|---|
| 85 cm | 1,086 kcal/day |
| 128 cm | 1,355 kcal/day |
| 170 cmstart | 1,618 kcal/day |
| 255 cm | 2,149 kcal/day |
| 340 cm | 2,680 kcal/day |
HEALTH & FITNESS GUIDE
A quick guide to BMR Mifflin St Jeor
Use it to get an accurate estimated BMR in seconds — free, with no sign-up.
Instant results
See your estimated BMR the moment you enter your numbers.
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Accurate & transparent
The same standard formula runs on our server for every calculation.
How to Use the BMR Mifflin St Jeor Calculator
1
Choose Sex
Provide your sex.
2
Enter Weight
Provide your weight, in kg.
3
Enter Height
Provide your height, in cm.
4
View Your Results
Get your estimated BMR instantly, calculated on our server.
What is BMR Mifflin St Jeor?
This health & fitness tool works out your estimated BMR instantly, so you don't have to do the math by hand.
“One quick calculation, so you always know your estimated BMR before you decide.”
What Affects Your Estimated BMR
Your estimated BMR depends on the values below.
Sex
Changing your sex changes your estimated BMR.
Weight
Changing your weight changes your estimated BMR.
Height
Changing your height changes your estimated BMR.
Age
Changing your age changes your estimated BMR. Typically between 15 and 100 years.
Example Result
Here's what you can expect from a BMR mifflin st jeor calculation:
- Sex
- male
- Weight
- 70 kg
- Height
- 170 cm
- Age
- 30 years
- Estimated BMR
- 1,618 kcal/day
Frequently Asked Questions
- How does sex affect estimated BMR?
- Switching sex from male to female changes estimated BMR from 1,618 kcal/day to 1,452 kcal/day (−10%).
- How does weight affect estimated BMR?
- If weight goes from 70 kg to 105 kg, estimated BMR changes from 1,618 kcal/day to 1,968 kcal/day (+22%).
- How to calculate BMR mifflin st jeor?
- Fill in sex, weight and height in the BMR Calculator (Mifflin-St Jeor) above and your estimated BMR is calculated instantly. Change any value to see how the result responds.
- What does an example BMR mifflin st jeor calculation look like?
- If sex is male, weight is 70 kg, height is 170 cm and age is 30 years, the estimated BMR is 1,618 kcal/day.
- Is this calculator free to use?
- Yes — every calculator on this site is completely free, with no sign-up or account required.
- How accurate is this calculator?
- It uses the standard formula and calculates on our server for every request, so results are precise for the values you enter.
- Is my data saved anywhere?
- No. Nothing you enter is stored or sent anywhere unless you choose to share a link with your values included.
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