Body Mass Index (BMI) Calculator

To use this BMI calculator:

1. Select your preferred unit system (imperial or metric).
2. Enter your weight in pounds or kilograms.
3. Enter your height in feet and inches, or centimeters.
4. Your BMI, weight category, and healthy weight range will appear instantly.

Use the results as a starting point for a conversation with your healthcare provider about your overall health and wellness goals.

Body Mass Index (BMI) is a numerical value derived from your weight and height. Developed by Belgian mathematician Adolphe Quetelet in the 19th century, BMI is widely used by healthcare professionals as a quick screening tool to categorize individuals into weight classes: underweight, normal weight, overweight, and obese.

While BMI does not measure body fat directly, research shows that it correlates moderately with more direct measures of body fat such as skinfold thickness measurements and dual-energy X-ray absorptiometry (DEXA) scans.

The BMI formula depends on your unit system:

• Metric: BMI = weight (kg) / [height (m)]²
• Imperial: BMI = 703 × weight (lbs) / [height (in)]²

For example, a person weighing 160 lbs at 5'9" tall has a BMI of 703 × 160 / 69² = 23.6, which falls within the normal weight range.

Example 1: A 150 lb person who is 5'6" (66 inches) tall: BMI = 703 × 150 / 66² = 24.2 (Normal weight).

Example 2: A 90 kg person who is 180 cm tall: BMI = 90 / 1.80² = 27.8 (Overweight).