# BMI Calculator

> Compute Body Mass Index from height and weight, with the standard category scale and the healthy weight range for your height.

**URL:** https://www.calculatoranswers.com/bmi-calculator
**Category:** Health

## Quick Answer

Enter your height and weight to calculate your BMI. The result is classified as underweight (under 18.5), normal (18.5-24.9), overweight (25-29.9), or obese (30+) per WHO standards.

## Definition

Body mass index (BMI) is a value derived from the weight and height of a person, calculated as weight in kilograms divided by the square of height in meters (kg/m²). It is used by the World Health Organization and CDC as a population-level screening tool to classify individuals as underweight, normal weight, overweight, or obese. BMI does not directly measure body fat and may be inaccurate for athletes, the elderly, or pregnant women.

## How to Use

1. **Choose your unit system** — Select metric (kilograms and centimeters) or imperial (pounds and inches).
2. **Enter your height** — Type your height in your chosen units. For imperial, you can enter feet and inches separately.
3. **Enter your weight** — Type your current weight in your chosen units.
4. **Read your BMI and category** — The calculator displays your BMI value and classification per WHO standards (underweight, normal, overweight, or obese).

## Disclaimer

This calculator provides estimates for educational and planning purposes. Always consult a qualified professional for specific advice on financial, medical, legal, or other regulated decisions.

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