Find your Body Mass Index (BMI) in seconds. Enter your height and weight and get your BMI score with its health category — free, instant and no sign-up needed.
How to Use
- Enter your height in centimetres.
- Enter your weight in kilograms.
- Click Calculate BMI to see your score and category.
- Press Clear to start over.
Key Features
- Instant BMI score to one decimal place.
- Colour-coded category — Underweight, Normal, Overweight or Obese.
- Reference ranges shown with every result.
- Sensible validation that flags empty or unrealistic figures.
- 100% private — everything is calculated in your browser.
FAQs
Is this BMI calculator free?
Yes. It is completely free with no sign-up and no limits.
How is BMI calculated?
BMI is your weight in kilograms divided by the square of your height in metres (kg/m²).
What counts as a healthy BMI?
A BMI between 18.5 and 24.9 is generally considered the normal (healthy) range for adults.
Is BMI a medical diagnosis?
No. BMI is a simple screening measure and does not replace professional medical advice. If you have health concerns, speak to a qualified professional.