Fitness

BMI calculator

Calculate Body Mass Index with interpretation and healthy range reference.

Height (cm)

Weight (kg)

100% private. All processing happens locally in your browser — no files or data are ever sent to a server.

How to use BMI calculator

01 Fill in the required values using the fields provided
02 Results calculate automatically as you type
03 Copy or note the result — all calculations stay on your device

Frequently asked questions

Common questions about BMI calculator.

Is BMI calculator free to use?

Yes, BMI calculator is completely free. No account, subscription, or payment is ever required — just open the page and start using it.

Does BMI calculator upload my data to a server?

No. BMI calculator runs entirely in your web browser using client-side JavaScript. Your files, text, and data never leave your device, making it 100% private.

Can I use BMI calculator on my phone or tablet?

Yes. BMI calculator is fully responsive and works on all modern smartphones, tablets, and desktop browsers without installing any app.

Are these results accurate enough to rely on?

BMI calculator uses well-established formulas and provides accurate estimates for everyday use. For financial, medical, or legal decisions, always consult a qualified professional.

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About BMI calculator

Body Mass Index (BMI) is calculated by dividing weight in kilograms by height in metres squared (kg/m²) and is used as a simple screening tool to classify weight status. The standard WHO classifications are: underweight (below 18.5), normal weight (18.5–24.9), overweight (25–29.9), and obese (30 and above). The BMI Calculator produces your result with the full classification scale for reference. While BMI has well-documented limitations — it doesn't distinguish between muscle and fat mass, nor does it account for fat distribution — it remains the standard first-line screening measure in clinical and public health settings worldwide.