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BMI Calculator
Calculate your Body Mass Index (BMI). BMI is an indirect assessment of body fat composition used by medical and academic institutes to establish weight health categories.
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Interactive BMI Calculator Workspace
Your Body Mass Index22.86Normal Weight
< 18.5 (Thin)18.5 - 24.9 (Healthy)25.0+ (Overweight)
Mathematical Formula & Variables
Equation Model
BMI = kg / m² (or [lbs * 703] / in²)Body Mass Index is a simple mathematical ratio of a person's total weight relative to the square of their vertical height.
Variable Definitions
| Symbol | Description |
|---|---|
| BMI | Body Mass Index metric score |
| kg | Weight in kilograms |
| m | Height in meters |
| lbs | Weight in pounds |
| in | Height in inches |
How to Use the BMI Calculator
- Select your preferred measurement standard (Metric or Imperial).
- Input your current vertical height (in centimeters or inches).
- Input your total body weight (in kilograms or pounds).
- Click calculate to determine your BMI score and review which WHO health band your result lands in.
Practical Example Calculation
Scenario Context: Calculating the BMI score of an individual who stands 5 feet 10 inches tall (70 inches) and weighs 160 pounds.
Step 1: Identify height in inches: 70 inches.
Step 2: Identify weight in pounds: 160 lbs.
Step 3: Apply imperial multiplier: 160 * 703 = 112,480.
Step 4: Square the height in inches: 70 * 70 = 4,900.
Step 5: Divide total product: 112,480 / 4,900 = 22.95.
The BMI score is 22.95, categorized as a "Healthy/Normal Weight" range (18.5 - 24.9).
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