New

BMI Calculator

Calculate your Body Mass Index (BMI) from height and weight. Supports metric and imperial units with instant category display.

Enter your height in centimeters and weight in kilograms

Your BMI
Enter height & weight to calculate
BMI is a screening tool, not a diagnostic measure. It does not account for muscle mass, bone density, or body composition. Consult a healthcare professional for personalized advice.

How to Use This Tool

  1. 1

    Select your unit system

    Choose between Metric (cm/kg) or Imperial (ft, in/lbs) depending on your preference.

  2. 2

    Enter your height

    Input your height in centimeters for metric, or feet and inches for imperial measurement.

  3. 3

    Enter your weight

    Type your weight in kilograms (metric) or pounds (imperial) into the weight field.

  4. 4

    Read your BMI result

    Your Body Mass Index is calculated instantly and displayed with a color-coded category: underweight, normal, overweight, or obese.

Frequently Asked Questions

What is BMI and how is it calculated?
BMI (Body Mass Index) is a measure of body fat based on height and weight. The metric formula is weight (kg) ÷ height (m)². The imperial formula is (weight (lbs) × 703) ÷ height (in)².
What is a healthy BMI range?
A BMI between 18.5 and 24.9 is generally considered normal weight. Below 18.5 is underweight, 25–29.9 is overweight, and 30+ is classified as obese by the WHO.
Is BMI accurate for athletes or muscular people?
BMI does not distinguish between muscle and fat mass. Athletes with high muscle mass may have a high BMI but low body fat. Consider additional metrics like body fat percentage for a more complete picture.
Can I use this BMI calculator for children?
This calculator uses adult BMI categories. Pediatric BMI is assessed using age- and sex-specific percentile charts, which require a different tool.