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BMI Calculator

Calculate your Body Mass Index (BMI) using metric or imperial units and see your health category instantly.

1. BMI (Metric Units)

2. BMI (Imperial Units)

3. BMI Classification

Your BMI category will appear here after calculation.

Formulas Used

1. BMI (Metric Units)

BMI = weight (kg) / (height (m))²

2. BMI (Imperial Units)

BMI = 703 × weight (lbs) / (height (in))²

3. BMI Classification

Underweight: < 18.5
Normal weight: 18.5 – 24.9
Overweight: 25 – 29.9
Obesity: ≥ 30

Steps

To calculate BMI using metric units:

  1. Convert height from centimeters to meters
  2. Square the height in meters
  3. Divide weight (kg) by height²
  4. The result is your BMI

To calculate BMI using imperial units:

  1. Square your height in inches
  2. Multiply your weight in pounds by 703
  3. Divide the result by height²
  4. The final number is your BMI

To determine your BMI category:

  1. Compare your BMI value to the classification ranges
  2. Identify whether you fall under underweight, normal, overweight, or obese

Understanding BMI

Body Mass Index (BMI) is a widely used health indicator that estimates whether your weight is appropriate for your height. It is commonly used by doctors, nutritionists, and fitness professionals to assess general health risks.

BMI does not measure body fat directly, but it provides a quick and useful approximation. It helps identify potential risks such as undernutrition, overweight, and obesity — all of which can impact long‑term health.

This calculator supports both metric and imperial units, making it easy to calculate your BMI no matter where you live. The formulas and steps above show exactly how the calculation works, helping you understand your results more clearly.