BMI calculator
Your BMI, the category it falls in, and the healthy range for your height.
A healthy BMI at this height is 56.7 kg to 76.3 kg.
BMI is a rough screening number, not a diagnosis: it ignores muscle, build, age and origin. Athletes and older people are often misclassified. Talk to a doctor about what it means for you.
BMI is weight divided by height squared: a rough screening number invented for populations, not individuals. It is used everywhere because it needs only two measurements.
The calculator shows your figure, the category it lands in, and — more useful day to day — the weight range that would put you between 18.5 and 25 at your height.
Treat it as one data point. It knows nothing about muscle, frame, age or body composition, which is why athletes come out "overweight" and it misjudges older people in the other direction.
How to use it
- Choose metric or imperial.
- Enter your height and weight.
- Read your BMI, its category, and the healthy range for your height.
Frequently asked questions
What are the categories?
Under 18.5 is underweight, 18.5–24.9 is the healthy range, 25–29.9 is overweight, 30 and above is obese. These are WHO thresholds for adults.
Why is BMI criticised?
Because it can’t tell muscle from fat and ignores where weight sits. A waist measurement or a body-fat estimate tells a doctor more, and BMI thresholds don’t fit every population equally well.
Does it work for children?
No. Children and teenagers are assessed with age-and-sex percentile charts instead, so use a paediatric calculator or ask a doctor.
Is my data private?
Yes. Your height and weight stay in the page; nothing is transmitted or stored.
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