BMI Calculator
Fill in the values and the answer updates as you type.
How the BMI Calculator works
BMI = weight (kg) ÷ height (m)². It is a screening number, not a diagnosis.
Inputs and results
The BMI Calculator takes 2 inputs and gives 2 results.
What you enter
- Weight (kg) — starts at 68.
- Height (cm) — starts at 170.
What you get
- Your BMI
- Category
Example: BMI Calculator with the starting values
With weight 68 kg and height 170 cm, the calculator returns:
| Your BMI | 23.5 |
|---|---|
| Category | Healthy range |
Change any value above and the results update straight away.
BMI Calculator FAQ
How do I use the BMI Calculator?
Enter weight and height in the fields, then read your bmi and category 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 BMI Calculator calculate?
Body mass index from weight and height. It returns your bmi and category from the 2 values you provide.
What values does the BMI Calculator start with?
It opens with weight 68 kg and height 170 cm 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 BMI 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 BMI 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.