BMI calculator
Body Mass Index — metric or imperial
Frequently asked questions
What is a healthy BMI?
A BMI between 18.5 and 24.9 is considered healthy for most adults. Below 18.5 is underweight, 25–29.9 is overweight, and 30 or above is classified as obese.
Is BMI accurate for everyone?
BMI is a useful screening tool but has limitations. It does not account for muscle mass, bone density, age, sex or fat distribution. Athletes may show a high BMI due to muscle rather than fat.
Can I use metric and imperial units?
Yes — toggle between metric (kg and cm) and imperial (lb, feet and inches) using the buttons at the top of the calculator.
What does the contrast checker show?
The WCAG contrast checker shows whether your colour meets accessibility standards against white and black backgrounds, with AA and AAA ratings.