BMI Calculator
Calculate your BMI with metric or imperial units. See your weight category, healthy weight range and how far you are from it. It runs entirely in your browser — no signup, no installation, and nothing you paste or drop leaves your device.
Body Mass Index categories (WHO)
| Category | Range |
|---|---|
| Underweight | < 18.5 |
| Normal weight | 18.5 – 24.9 |
| Overweight | 25.0 – 29.9 |
| Obesity class I | 30.0 – 34.9 |
| Obesity class II | 35.0 – 39.9 |
| Obesity class III | ≥ 40.0 |
How to Calculate Your BMI
Your Body Mass Index is your weight in kilograms divided by the square of your height in metres. This BMI calculator does that for you while you type: pick metric or imperial units, enter your height and weight, and you instantly see your BMI, your weight category according to the WHO table, and the healthy weight range that belongs to your height. The coloured gauge shows where you sit between underweight and obesity class III, and the detail line tells you exactly how many kilograms or pounds separate you from the healthy range. The calculation runs entirely in your browser, so your height and weight never leave your device — no upload, no signup, no tracking.
BMI berechnen — so funktioniert es
More free tools
What is BMI Calculator?
BMI Calculator is a free online health calculator built for people tracking weight, BMI and daily energy needs. Calculate your BMI with metric or imperial units. See your weight category, healthy weight range and how far you are from it In practice you enter your height and weight in metric or imperial units, run the calculation, and then read your BMI, weight category and healthy weight range.
Your height, weight and age are processed on your device only — nothing is sent to a server and nothing is saved between visits.
How to use BMI Calculator
- Enter your height and weight in metric or imperial units.
- Run the calculation.
- Read your BMI, weight category and healthy weight range.
BMI Calculator FAQ
Is BMI Calculator free to use?
Yes. BMI Calculator is completely free and needs no account, no trial and no payment details. Every feature on the page is available without limits.
Is my data uploaded anywhere?
No. BMI Calculator runs entirely in your browser, so the text, file or number you enter never leaves your device.
Does BMI Calculator work on a phone or tablet?
Yes. It works in any modern browser on desktop, tablet and phone. There is no app to install and no account to create.
How do I use BMI Calculator?
Enter your height and weight in metric or imperial units. Run the calculation. Read your BMI, weight category and healthy weight range.