Is the BMI Calculator free?

Yes, 100% free. No account, no data collection.

Is my health data sent to a server?

No. BMI is calculated entirely in your browser — your height and weight are never transmitted.

Does it support both metric and imperial?

Yes. Switch between metric (cm, kg) and imperial (ft/in, lbs) — conversions are handled automatically.

What are the BMI categories?

Underweight (< 18.5), Normal weight (18.5–24.9), Overweight (25–29.9) and Obese (≥ 30) per WHO classification.

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BMI Calculator

Calculate your Body Mass Index (BMI) and discover your healthy weight range.

Height

Weight

—

Body Mass Index

Under 18.5 18.5 24.9 30 35+

Healthy weight for your height: —

No data is sent anywhere. All calculations happen locally in your browser.

How it works

Choose your unit system
Select Metric (centimeters and kilograms) or Imperial (feet, inches and pounds) — conversions are handled automatically.

Enter your height and weight
Fill in both fields. Your BMI is calculated and updated in real time as you type.

Read your result
The tool displays your BMI value, the corresponding category (underweight, healthy weight, overweight or obese) and a color-coded visual scale.

Fully private
No data is stored or sent anywhere. All calculations run entirely in your browser — no account or internet connection needed.

BMI Calculator

How it works

Frequently Asked Questions