BMI Calculator (Metric & Imperial)

How to Use the BMI Calculator (Metric & Imperial)

1

Select your preferred measurement units (Metric or Imperial).

2

Enter your weight and height.

3

Click "Calculate BMI" to see your score and international category.

Formula & Underlying Logic

The Quetelet Body Mass Index Formula

Formulated by Adolphe Quetelet in the 19th century:

BMI = Weight (kg) ÷ [ Height (m) ]²

While useful for population health screening, BMI does not distinguish between lean skeletal muscle mass and adipose tissue.

Worked Step-by-Step Example

Example Scenario: 70 kg Adult with Height 1.75 m

Height squared: 1.75 × 1.75 = 3.0625 m²

BMI: 70 ÷ 3.0625 = 22.9 (Healthy Normal Weight)

Frequently Asked Questions

What are the Asian population BMI adjustments? +

The World Health Organization notes that for South Asian populations, public health action points for overweight start at 23.0 BMI due to elevated cardiovascular risk.

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