BMI Calculator
Calculate your Body Mass Index instantly. Enter your height and weight — the gauge moves in real time and shows your WHO category and healthy weight range.
How BMI Calculator works
Toggle metric or imperial, then enter your height and weight.
The needle moves live to your BMI value. The colour indicates your WHO category.
See your healthy weight range for your height so you know how much to gain or lose.
Frequently asked
What is a healthy BMI?+
WHO defines 18.5–24.9 as the healthy range for adults. Below is underweight, 25–29.9 is overweight, and 30+ is obese.
Is BMI accurate for athletes?+
BMI can overestimate body fat for muscular people. For a better body-composition measure, use our Body Fat Calculator.
Does BMI apply to children?+
This tool uses adult WHO cut-offs. For children (2–20 yrs), BMI is interpreted against age-and-sex percentiles by a paediatrician.
Is my data stored?+
No — everything runs in your browser. Nothing is uploaded.