BMR Calculator
Calories your body burns at complete rest.
Enter your values
Choose one of: Metric (kg, cm), Imperial (lb, in).
Enter the weight you are working with.
Enter the height you are working with.
Enter the age in years.
Choose one of: Male, Female.
Results update instantly as you type — no submit needed. Your values are remembered on this device, and the shareable link reopens the calculator with exactly these numbers.
- BMR
- 1,711 kcal/day
- Maintenance if moderately active
- 2,653 kcal/day
- Per hour at rest
- 71 kcal
| Activity level | Daily calories |
|---|---|
| Sedentary | 2,054 kcal |
| Lightly active | 2,353 kcal |
| Moderately active | 2,653 kcal |
| Very active | 2,952 kcal |
| Athlete | 3,252 kcal |
Quick answer
Basal metabolic rate is the energy your body uses at rest; the Mifflin-St Jeor equation is the most accurate common estimate.
BMR = 10·kg + 6.25·cm − 5·age + s (s = +5 male, −161 female)
At a glance
| What it does | Calories your body burns at complete rest. |
|---|---|
| Category | Health |
| Inputs needed | Units, Weight, Height, Age, Sex |
| Main output | BMR |
| Formula | BMR = 10·kg + 6.25·cm − 5·age + s (s = +5 male, −161 female) |
| Cost | Free — no sign-up, no download |
How to use the BMR Calculator
- 1Enter weight, height, age and sex.
- 2Read your BMR.
- 3Pick your activity level from the table for daily needs.
Inputs explained
- Units
- Choose one of: Metric (kg, cm), Imperial (lb, in).
- Weight
- Enter the weight you are working with.
- Height
- Enter the height you are working with.
- Age(years)
- Enter the age in years.
- Sex
- Choose one of: Male, Female.
Worked example
Using the values the calculator loads with:
Inputs
- UnitsImperial (lb, in)
- Weight170
- Height69
- Age32 years
- SexMale
Results
- BMR1,711 kcal/day
- Maintenance if moderately active2,653 kcal/day
- Per hour at rest71 kcal
Frequently asked questions
BMR vs TDEE?
BMR is rest-only energy use. TDEE multiplies BMR by an activity factor to include movement, exercise and digestion.
Why Mifflin-St Jeor?
It has been validated as more accurate for modern populations than the older Harris-Benedict equation.
What do I need to enter into the BMR Calculator?
Just 5 values: units, weight, height, age, sex. Every field starts with a realistic example, so you can change one number at a time and watch the result update instantly.
How does the BMR Calculator work out the answer?
Basal metabolic rate is the energy your body uses at rest; the Mifflin-St Jeor equation is the most accurate common estimate. It applies the formula BMR = 10·kg + 6.25·cm − 5·age + s (s = +5 male, −161 female) and shows the working so you can check each step by hand.
Is the BMR Calculator free, and do I need an account?
It is completely free with no sign-up, no download and no usage limit. Everything is calculated in your browser, so the numbers you type never leave your device.
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.