How to Calculate Your BMI (Body Mass Index)
Published September 21, 2026 · 2 min read
BMI is a simple, widely-used screening calculation based on height and weight. This tool computes it from either metric or imperial units and shows which WHO weight category the result falls into.
Try BMI CalculatorSteps
- 1
Open the BMI Calculator tool
Go to the BMI calculator.
- 2
Enter your weight
Type your weight, in kilograms or pounds.
- 3
Enter your height
Type your height, in centimeters or inches.
- 4
Read your BMI and category
See your calculated BMI and its corresponding WHO weight category.
Frequently asked questions
The standard BMI formula: weight in kilograms divided by height in meters squared, with automatic conversion if you enter imperial units.
Underweight (below 18.5), Normal weight (18.5–24.9), Overweight (25–29.9), and Obese (30 and above) — the standard adult BMI classification ranges.
BMI is a simple screening tool based only on height and weight — it doesn't account for muscle mass, body composition, or individual health factors, so it's best treated as a general indicator rather than a complete health assessment.
Because the calculation is instant, this gives you a quick reference figure without needing to look up the formula or do the math yourself.