Understanding your BMI Result

What is BMI?

Body Mass Index (BMI) is a simple numerical measure of a person's thickness or thinness based on their height and weight. It is widely used by healthcare professionals to categorize individuals into weight groups that may impact their health.

BMI is a screening tool, not a diagnostic of overall body fat or health.

It does not account for muscle mass, bone density, or overall body composition.

The Formula (Imperial vs Metric)

Our calculator handles the math for you, but knowing the logic is helpful:

Metric Formula:

BMI = weight (kg) / [height (m)]²

Imperial Formula (US):

BMI = 703 * weight (lbs) / [height (in)]²

BMI Range	Category
Below 18.5	Underweight
18.5 – 24.9	Normal / Healthy weight
25.0 – 29.9	Overweight
30.0 and Above	Obese

Use BMI Calculator (Imperial & Metric) in your browser

Calculate your Body Mass Index (BMI) using US Imperial (lbs/in) or Metric (kg/cm) units. Includes healthy weight range charts and fitness category analysis. It runs directly in your browser, so you can start straight away without creating an account or installing anything.

Simple to start

Open the workspace above, choose your options, and get the result when you need it.

Made for any screen

The controls are designed to stay usable on phones, tablets, and desktops.

BMI Calculator (Imperial & Metric)

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