calculators

BMI Calculator

calculate body mass index from height and weight in metric or imperial units, with WHO category classification

Ready

Unit System

Weight

Height (cm)

Output

Example output:
BMI: 24.5
Category: Normal weight
Health Risk: Low

About BMI Calculator

Calculate your Body Mass Index (BMI) from height and weight in metric or imperial units. Results include your BMI value, WHO category classification, health risk level, and healthy weight range for your height.

Use cases

Check whether your current weight falls within the healthy range for your height.
Convert between metric and imperial inputs to get a consistent BMI reading.
Reference the full WHO BMI scale to understand classification thresholds.

Examples

75 kg at 175 cm gives a BMI of 24.5, within the normal range.

Input

System: Metric
Weight: 75 kg
Height: 175 cm

Output

BMI: 24.5
Category: Normal weight
Health Risk: Low

200 lbs at 5ft 10in gives a BMI of 28.7, classified as overweight.

Input

System: Imperial
Weight: 200 lbs
Height: 5ft 10in

Output

BMI: 28.7
Category: Overweight
Health Risk: Elevated

FAQ

Does this tool send my data to a server?

No. All calculations happen locally in your browser tab.

What is a healthy BMI?

A BMI between 18.5 and 24.9 is classified as normal weight by the World Health Organization.

What is the BMI formula?

Metric: BMI = weight(kg) / height(m)². Imperial: BMI = 703 × weight(lbs) / height(in)².

Are BMI thresholds the same for all populations?

The standard WHO thresholds are used here. Some health organizations recommend lower cutoffs for certain Asian populations. Always consult a healthcare professional for personalized advice.