BMI Calculator

Calculate Body Mass Index in metric or imperial units with health category guidance.

BMI Calculator computes Body Mass Index from height and weight in either metric or imperial units, then maps the result onto the standard World Health Organization categories: underweight, healthy weight, overweight, and the obesity classes. The formula is the same one used by clinicians, public health agencies, and insurance providers, so the number matches what you would get at a doctor's office. BMI is a population-level health screening tool, not a complete picture of individual health — it does not account for muscle mass, frame size, age, gender, or fitness level — but it remains the most widely cited indicator and is required input for many health forms, life insurance applications, and fitness program intakes. The tool runs entirely in your browser, so the height and weight you enter never get logged, sold, or attached to your identity by an ad network.

How BMI Calculator works

BMI Calculator is a free browser-based utility from Salah Tools Hub. It is designed to give you an immediate result without an account, subscription, or upload to a remote server.

Enter your information into the tool after the page loads, review the result, and use the available copy or download controls. Your input stays on your device while the tool is running.