BMI Calculator

Check your Body Mass Index (BMI) to understand your weight category and health status.

Weight

Please enter a valid weight.

Height

Please enter a valid height.

22.5

Normal

Healthy weight for your height: -- kg

How the BMI Calculator Works

Body Mass Index (BMI) is a simple index of weight-for-height that is commonly used to classify underweight, overweight, and obesity in adults.

The BMI is defined as the body mass divided by the square of the body height.

Example 1: Weight: 70kg, Height: 175cm (1.75m).
BMI = 70 / (1.75 * 1.75) = 22.86 (Normal)

Example 2: Weight: 150 lbs, Height: 5ft 5in (65 inches).
BMI = 703 * 150 / (65 * 65) = 24.96 (Normal)

Example 3: Weight: 90kg, Height: 180cm (1.8m).
BMI = 90 / (1.8 * 1.8) = 27.78 (Overweight)

What are the standard BMI categories?

Underweight (Under 18.5), Normal weight (18.5–24.9), Overweight (25–29.9), and Obese (30 or greater).

Is BMI accurate for everyone?

BMI is a useful screening tool but may not be accurate for athletes with high muscle mass, pregnant women, or the elderly.

Why use 703 in the imperial formula?

The factor of 703 is used to convert pounds and inches into the equivalent metric units so the resulting BMI scale remains the same.

Does age or gender affect BMI?

For adults (20 years and older), BMI is interpreted using standard weight status categories that are the same for all ages and both men and women.