BMI Calculator
Check your Body Mass Index instantly — metric or imperial, with your weight category and healthy weight range.
Free BMI Calculator — Body Mass Index in Seconds
Body Mass Index (BMI) is the world's most widely used screening measure for weight categories. Enter your weight and height above — in kilograms/centimeters or pounds/feet-inches — and this calculator instantly shows your BMI, which category you fall into, and the healthy weight range for your height.
⚖️ Metric & Imperial
Switch between kg/cm and lb/ft-in with one tap — the formula converts automatically.
🎨 Color-Coded Result
Your category is highlighted instantly: blue, green, amber or red.
🎯 Healthy Range
See the exact weight span that keeps your BMI in the healthy 18.5–24.9 zone.
🔒 Fully Private
No signup, no tracking. Your numbers never leave your browser.
Frequently Asked Questions
BMI is your weight in kilograms divided by the square of your height in meters. In imperial units, it is (weight in pounds / height in inches squared) × 703. Both formulas give the same result.
A BMI between 18.5 and 24.9 is considered the healthy (normal) range for most adults. Below 18.5 is underweight, 25 to 29.9 is overweight, and 30 or above is obese.
Not always. BMI cannot distinguish muscle from fat, so very muscular people may show a high BMI without excess body fat. It is a screening tool, not a diagnosis — talk to a doctor for a full assessment.
The healthy range is the weight span that keeps your BMI between 18.5 and 24.9 for your height. For example, at 170 cm tall, a healthy weight is roughly 53.5 to 72.3 kg.
Yes — completely free, with no account required. Everything is calculated in your browser and none of your data is sent anywhere.