About the BMI Calculator
BMI Calculator does the math for you. Enter your values in the format shown and the result appears immediately — no spreadsheets, no formulas to remember, and nothing is uploaded to a server.
How BMI works
Body Mass Index compares your weight to your height:
BMI = weight(kg) / height(m)²
Worked example — 70 kg, 175 cm:
- Convert height to metres: 175 cm = 1.75 m
- Square the height: 1.75 × 1.75 = 3.0625
- Divide weight by that: 70 / 3.0625 = 22.9
- 22.9 falls in 18.5–24.9, so the category is Normal weight.
Categories: under 18.5 underweight, 18.5–24.9 normal, 25–29.9 overweight, 30+ obese.
How to use
- Enter your values as shown in the input box.
- The result is calculated instantly.
- Click Copy to use it.
Examples
| Input | BMI |
|---|---|
70 kg, 175 cm | 22.9 (Normal) |
90 kg, 180 cm | 27.8 (Overweight) |
55 kg, 170 cm | 19.0 (Normal) |
Common uses
- Quick everyday math.
- Double-checking figures fast.
- Schoolwork and homework.
- Finance, health and planning.
Frequently asked questions
Is my data uploaded?
No — the calculation runs entirely in your browser, so your data stays private.
Is it free?
Yes — completely free with no sign-up.