BMR Calculator
BMR Calculator: free, instant and private. BMR is the energy you would burn lying still all day.
How the BMR Calculator works
The BMR Calculator takes Weight (kg), Height (cm), Age (years), Sex and returns the answer instantly — no button to hunt for, no page reload. BMR is the energy you would burn lying still all day. Multiply it by an activity factor to get maintenance calories — around 1.2 for desk work, 1.55 for moderate training.
Enter your own numbers to replace the example values; the result panel updates as you type. Everything runs in this single page, so nothing you enter leaves your device.
Formula used
BMR = 10 × weight + 6.25 × height − 5 × age + (5 male / −161 female)
| Symbol | Meaning |
|---|---|
| weight | kilograms |
| height | centimetres |
| age | years |
| sex | biological sex used by the Mifflin-St Jeor equation |
BMR is the energy you would burn lying still all day. Multiply it by an activity factor to get maintenance calories — around 1.2 for desk work, 1.55 for moderate training.
Inputs used: Weight (kg), Height (cm), Age (years), Sex.
Worked example
Take the default example — weight (kg) of 70, height (cm) of 170, age (years) of 30, sex set to Male:
- BMR (calories/day): 1,617.5
Frequently asked questions
- What formula does the BMR Calculator use?
- It uses BMR = 10 × weight + 6.25 × height − 5 × age + (5 male / −161 female), where weight is the kilograms; height is the centimetres; age is the years; sex is the biological sex used by the Mifflin-St Jeor equation.
- Is the BMR Calculator free?
- Yes. There is no signup, no usage limit and no watermark — the calculator runs entirely in your browser.
- How do I read the result?
- BMR is the energy you would burn lying still all day. Multiply it by an activity factor to get maintenance calories — around 1.2 for desk work, 1.55 for moderate training.
- Does the BMR Calculator store or send my data?
- No. Every calculation happens locally in the page, so the numbers you type are never uploaded or logged.
- Does it work on a phone and offline?
- Yes — the page is a single lightweight file that adapts to any screen size. Once it has loaded it keeps working without a network connection.