Under
Normal
Over
Obese
BMI is a general indicator and does not account for muscle, bone density, or body composition. For health advice, consult a qualified professional.
Calculate your Body Mass Index in metric or imperial units and see which weight category you fall into.
Body Mass Index is a quick, widely used way to check whether your height and weight fall into a typical healthy range — useful before a check-up, when tracking fitness progress, or just out of curiosity. Enter your numbers in whichever unit system you're used to and get the result calculated instantly in your browser, with no data ever leaving your device.
Select "Metric (cm, kg)" or "Imperial (in, lb)" from the toggle at the top.
Fill in the fields shown for your chosen unit system — height in cm or feet/inches, weight in kg or pounds.
Your BMI number, weight category, and position on the underweight-to-obese scale appear immediately below.
Runs in your browser — nothing uploaded
cm/kg or ft/in/lb
See your weight range
No registration required
Choose metric or imperial units, enter your height and weight, then click Calculate. Your BMI and weight category appear instantly. Completely free.
For most adults a BMI from 18.5 to 24.9 is considered the normal range. Below 18.5 is underweight, 25 to 29.9 is overweight, and 30 or above is obese.
BMI equals weight in kilograms divided by height in metres squared. The imperial formula is 703 times weight in pounds divided by height in inches squared.
BMI is a general guide and does not distinguish muscle from fat. Athletes and some body types may get misleading results, so treat it as a rough indicator.
No. The calculation happens entirely in your browser. Your height and weight are never uploaded — guaranteed privacy.
This calculator uses adult categories. Children and teens use age and sex specific percentiles, so consult a pediatric chart or doctor for them.