BMI Calculator

Calculate your Body Mass Index (BMI) from your height and weight, in metric or imperial units. Get your BMI value along with its standard weight category.

Units

Height (cm)

Weight (kg)

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Why use BMI Calculator?

Body Mass Index (BMI) is a simple screening measure calculated from height and weight. This calculator supports both metric and imperial units and returns your BMI value alongside its standard weight category. BMI is a general indicator, not a diagnostic tool — it does not account for muscle mass, bone density, or overall body composition.

Key benefits

Supports both metric and imperial units
Shows the standard BMI weight category alongside your score
Runs entirely in your browser — no signup, no data stored

Features

Metric (kg/cm) and imperial (lb/ft/in) input modes
Standard BMI category labels (underweight, normal, overweight, obese)

Popular use cases

A quick health screening check
Tracking BMI changes over time alongside a fitness plan
Filling in a BMI field on a health form

How to use BMI Calculator

1
Choose your units
Select Metric (centimeters and kilograms) or Imperial (feet, inches, and pounds).
2
Enter height and weight
Fill in your height and weight in the selected units.
3
Read your BMI
Your BMI and weight category appear automatically.

Frequently asked questions

How is BMI calculated?

Metric: weight (kg) ÷ height (m)². Imperial: (weight (lb) ÷ height (in)²) × 703.

Is BMI an accurate measure of health?

BMI is a general screening tool and does not account for muscle mass, bone density, age, sex, or body composition. It should not replace advice from a healthcare provider.

What are the standard BMI categories?

Underweight: below 18.5. Normal weight: 18.5–24.9. Overweight: 25–29.9. Obese: 30 and above.

Last reviewed: July 2026

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