BMI Calculator
Calculate your Body Mass Index (BMI) from your height and weight in metric or imperial units, and see which weight category it falls into.
🔒 Runs 100% in your browser — nothing is uploaded
About the BMI calculator
Body Mass Index (BMI) is a quick way to estimate whether your weight is in a healthy range for your height. Enter your measurements in metric or imperial units and your BMI and category update instantly. BMI is a general screening tool — it does not measure body fat directly or account for muscle, so use it as guidance alongside advice from a health professional.
Frequently asked questions
How is BMI calculated?
BMI is your weight in kilograms divided by the square of your height in meters (kg/m²). This tool does the conversion for imperial units automatically.
What is a healthy BMI?
For most adults, a BMI between 18.5 and 24.9 is considered a healthy weight. BMI is a general guide and does not account for muscle mass, so treat it as one data point, not a diagnosis.
Is my data saved?
No. The calculation runs entirely in your browser and nothing is stored or uploaded.