BMI Calculator

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Calculate your Body Mass Index instantly. Switch between metric and imperial units and see your health category in real time.

Calculators

Height (cm)

Weight (kg)

Age (optional)

Sex (optional)

Your BMI

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Enter values to begin

About the BMI Calculator

The BMI Calculator estimates your Body Mass Index from your height and weight. BMI is a widely used screening figure — it doesn't measure body fat directly but gives a quick, standardized number that healthcare professionals use to categorize weight relative to height.

How to use the BMI Calculator

1Choose metric (kg / cm) or imperial (lb / in) units.
2Enter your current weight and height.
3Read your BMI value and the WHO weight-category label that appears next to it.
4Compare against the healthy range shown below the result.

Why people use it

Quickly check where your weight sits relative to a standardized reference.
Track BMI over time as part of a broader fitness plan.
Estimate BMI for children or adults as a first-pass screening.
Compare metric and imperial reporting for international audiences.

Frequently asked questions

What is a healthy BMI range?

For most adults, the WHO defines 18.5–24.9 as normal weight, 25–29.9 as overweight, and 30+ as obese. These ranges are guidelines and don't apply to every body type.

Does BMI account for muscle mass?

No. BMI only uses weight and height, so very muscular people can score in the overweight range even at low body fat. Combine BMI with body-fat percentage or a professional assessment for a fuller picture.

Is my data saved?

Processed locally in your browser. Your data is processed on your device without requiring an upload to our servers.

Can I use this for children?

The formula is the same, but interpretation for children and teens uses age- and sex-specific percentiles. Consult a pediatric growth chart or a doctor for children.