BMI Calculator
Enter your height and weight to get your BMI instantly — with clear, plain-word guidance on the healthy range.
What is the BMI Calculator?
Body Mass Index is the world's most widely used quick screening measure for weight-related health — a simple ratio of weight to height that doctors and health organizations use as a first check. The MuftTools BMI Calculator does the arithmetic instantly in metric or imperial units and places your result in its category: underweight, healthy, overweight or obese, each explained in plain words rather than medical jargon.
An honest note, because integrity matters here: BMI is a screening tool, not a diagnosis. Muscular athletes can score as “overweight” while being perfectly fit, and it doesn't suit every body type, age or pregnancy. Treat your result as a useful personal reference point — and talk to a qualified health professional about any real health decisions. As always, the calculation is private: nothing is stored or sent anywhere.
How to use the BMI Calculator
- Enter your height in centimeters — or feet and inches.
- Enter your weight in kilograms or pounds.
- Click the Calculate button.
- See your BMI number and its category instantly.
- Read the plain-word guidance, remembering it's a screening measure, not medical advice.
Key features
- Metric and imperial units supported
- Instant BMI number plus category
- Healthy-range guidance in plain language
- Private — nothing stored, tracked or sent
- Free forever, no sign-up
- Fully mobile-friendly
Frequently asked questions
What counts as a healthy BMI?
For most adults, a BMI between 18.5 and 24.9 is considered the healthy range. Below that is underweight; above it, the overweight and obese categories begin.
Is BMI accurate for everyone?
It's a useful screening tool, but not a full picture. Muscle mass, age, and pregnancy can all skew it — which is why professionals use it alongside other measures.
Is this medical advice?
No. The calculator is for personal reference only. For health decisions, always consult a qualified medical professional.
Is my height and weight data saved?
No. The calculation runs locally in your browser and nothing leaves your device.