BMI Calculator
Estimate your Body Mass Index from height and weight and see which standard category it falls into. Works in metric or imperial units.
How to use bmi calculator
- Choose units
Switch between metric and imperial to match how you measure.
- Enter height and weight
Type your measurements into the two fields.
- Calculate
Click Calculate to see your BMI value and category.
Features
Enter centimetres and kilograms, or inches and pounds.
See where you fall on the underweight-to-obese range at a glance.
Your health numbers are never uploaded.
Frequently asked questions
How is BMI calculated?
BMI is weight in kilograms divided by height in metres squared. Imperial inputs are converted before the same formula is applied.
Is BMI a complete health measure?
No. BMI is a rough screening tool. It ignores muscle mass, body composition and other factors, so treat it as one signal, not a diagnosis.
What are the standard categories?
Under 18.5 is underweight, 18.5–24.9 normal, 25–29.9 overweight, and 30 or above is in the obese range.