BMI Calculator — Body Mass Index
Calculate your BMI and see your healthy weight range. Supports metric (kg/cm) and imperial (lbs/ft) units. No signup, no tracking — runs entirely in your browser.
What is BMI?
Body Mass Index (BMI) is a numerical value calculated from your weight and height. It provides a simple way to screen for weight categories that may indicate health risks.
The formula is: BMI = weight (kg) ÷ height² (m²)
BMI is a screening tool rather than a diagnostic measure. It does not account for muscle mass, bone density, age, or sex. Consult a healthcare professional for a complete health assessment.
Frequently Asked Questions
How is BMI calculated?
BMI equals your weight in kilograms divided by your height in metres squared (kg/m²). The tool also supports imperial units and converts automatically.
What is a healthy BMI range?
For most adults a BMI of 18.5–24.9 is considered the healthy range; below 18.5 is underweight and 25 or above is overweight.
What are the BMI categories?
Underweight (<18.5), Normal (18.5–24.9), Overweight (25–29.9) and Obese (30+), shown with a visual scale.
Is BMI accurate for everyone?
BMI is a useful general screening number but does not distinguish muscle from fat, so very muscular people or athletes may read as overweight.
Does it work in pounds and feet?
Yes. You can switch between metric (kg/cm) and imperial (lb/ft-in) and the result updates instantly.
Is this medical advice?
No. BMI is an educational estimate and is not a diagnosis. Consult a healthcare professional for personalised guidance.