BMI Calculator
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A BMI calculator estimates whether your weight is in a healthy range for your height, using the Body Mass Index — your weight in kilograms divided by your height in metres squared. The World Health Organization uses BMI bands to flag underweight, normal, overweight, and obese ranges. It's a quick screening number, not a full health check, and it runs entirely on your device.
How to use it
- Enter your weight in kilograms and your height in centimetres.
- Your BMI and its category appear instantly.
- Compare against the WHO bands shown to see where you fall.
Examples
- 70 kg at 175 cm → BMI 22.86 (Normal weight).
- 90 kg at 170 cm → BMI 31.14 (Obese).
Frequently asked questions
- What is a healthy BMI range?
- For most adults the World Health Organization considers a BMI of 18.5 to 24.9 as the normal range. Below 18.5 is underweight, 25 to 29.9 is overweight, and 30 or above is obese. These bands are the same for men and women.
- Is BMI accurate for athletes?
- Not always. BMI can't tell muscle from fat, so very muscular people — athletes, weightlifters — may show a high BMI while carrying little body fat. For them, a body-fat measurement gives a truer picture.
- How is BMI calculated?
- BMI is your weight in kilograms divided by your height in metres, squared. For 70 kg at 1.75 m: 70 ÷ (1.75 × 1.75) = 22.86. This calculator does the conversion from centimetres for you.
- Does BMI differ for men and women?
- The BMI formula and the standard adult bands are the same for both. Body composition differs between sexes, so BMI is best treated as a general screening tool rather than a precise measure of health.