ZapToolsBMI Calculator
Enter your height and weight to instantly see your BMI and which healthy-weight category you fall into.
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What is BMI?
Body Mass Index (BMI) is a screening measure that estimates body fat from height and weight: BMI = weight(kg) ÷ height(m)².
BMI categories (WHO)
- Below 18.5 — Underweight
- 18.5 to 24.9 — Normal weight
- 25 to 29.9 — Overweight
- 30 and above — Obese
Note: BMI is a general guide and doesn't distinguish muscle from fat. Athletes and pregnant women should consult a doctor.
Frequently Asked Questions
What is a healthy BMI?
A BMI between 18.5 and 24.9 is considered the healthy range for most adults.
Is BMI accurate for athletes?
Not always — muscle weighs more than fat, so muscular people may show a high BMI while being healthy.
Do you store my height and weight?
No. Everything is calculated locally in your browser.