BMR Calculator
Fill in the values and the answer updates as you type.
How the BMR Calculator works
Mifflin-St Jeor: 10 × kg + 6.25 × cm − 5 × age, then +5 for men or −161 for women.
Inputs and results
The BMR Calculator takes 4 inputs and gives 2 results.
What you enter
- Sex — starts at male. Choose from: male and female.
- Weight (kg) — starts at 68.
- Height (cm) — starts at 170.
- Age (years) — starts at 30.
What you get
- BMR (kcal/day)
- With light activity (kcal/day)
Example: BMR Calculator with the starting values
With sex male, weight 68 kg, height 170 cm and age 30 years, the calculator returns:
| BMR (kcal/day) | 1,598 |
|---|---|
| With light activity (kcal/day) | 2,197 |
Change any value above and the results update straight away.
BMR Calculator FAQ
How do I use the BMR Calculator?
Enter sex, weight, height and age in the fields, then read bmr (kcal/day) and with light activity (kcal/day) in the result panel. The answer updates as you type, and you can press Calculate or Enter to refresh it. Use “Copy link” to share your exact numbers with someone else.
What does the BMR Calculator calculate?
Calories your body burns at rest. It returns bmr (kcal/day) and with light activity (kcal/day) from the 4 values you provide.
What values does the BMR Calculator start with?
It opens with sex male, weight 68 kg, height 170 cm and age 30 years so you can see a working result straight away. Replace them with your own numbers, or press Reset to return to these starting values.
Is the BMR Calculator free and private?
Yes. It is free, needs no account, and runs in your browser, so nothing you type is sent to or stored on our servers. See the Privacy Policy for details.
Can I rely on the BMR Calculator for medical or health decisions?
Treat the result as a well-rounded estimate. Real situations often have details a general calculator cannot know, so confirm medical or health decisions with a qualified professional. See the Disclaimer for more.