PDF PremFree BMI Calculator
Know your number. PDF Prem's free BMI calculator checks your body mass index from height and weight and shows which health category you fall in.
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BMI is a screening guide, not a diagnosis.
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How to use the BMI Calculator
- Choose Metric (cm/kg) or Imperial (ft-in/lbs) units.
- Enter your height and weight.
- Your BMI appears instantly with a colour-coded health category.
- The marker on the bar shows where you sit across the full BMI range.
- Check the healthy weight range shown for your height.
- Remember BMI is a screening guide — talk to a doctor for health advice.
Frequently asked questions
What is BMI?
BMI (Body Mass Index) is weight in kilograms divided by the square of height in metres. It is a widely used screening measure for weight-related health risk.
What is a healthy BMI range?
18.5–24.9 is considered normal. Below 18.5 is underweight, 25–29.9 is overweight, and 30 or above is obese.
Is BMI accurate for athletes or muscular people?
Not always — muscle weighs more than fat, so very muscular people can show a high BMI while being fit. Pregnant women and the elderly should also treat it as a rough guide and consult a doctor.
Is this BMI calculator free?
Yes — free, private and no sign-up. All calculations happen in your browser.