BMI Calculator – Body Mass Index Calculator (Standard & Imperial)

BMI Calculator

Calculate your Body Mass Index easily — free and private.

Weight (kg)

Height (ft/in)

Weight (lb)

Height (ft/in)

Please enter valid weight and height values.

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UnderweightNormalOverweightObese

BMI is a general screening measure based on height and weight only — it doesn't account for muscle mass, bone density, age, sex, or body composition, and isn't a diagnosis. If you have concerns about your weight or health, please speak with a doctor or qualified healthcare provider.

All calculations happen locally in your browser. Nothing is uploaded or stored.

BMI Calculator Quick Check, Not a Verdict

A doctor's visit mentions BMI, or a fitness app asks for it during sign-up, and suddenly you're doing height-weight math you haven't touched since a school health class. This BMI calculator handles that instantly can enter your height in feet/inches and weight in kilograms or pounds, and it is works out your Body Mass Index along with which of the four standard categories it falls into.

What BMI  Calculator Actually Measures (and What It Doesn't)

BMI is a simple ratio of weight to height nothing more. It doesn't know whether that weight is muscle or anything on your body, you doesn't adjust for age or frame size, and it's not your fitness or health diagnosis by itself. It's a screening tool used because it's quick and consistent across large groups, not because it tells the full story for any one of them. Athletes with a lot of muscle, for instance, often land in "overweight" territory on BMI despite being lean and fit.

How to Use This BMI Calculator

• If You Choose Standard "Kilograms and Feet/Inches" or Imperial "Pounds and Feet/Inches".
• Enter your weight and height.
• Click "Calculate BMI" to see your number, its category, and where it sits on the standard scale.

FAQs

Is this BMI calculator free to use? Yes, completely free with no sign-up required.

Is my weight and height data stored anywhere? No — everything is calculated locally in your browser and never uploaded or saved.

Is BMI Calculator accurate for everyone? Not perfectly — it's a general population-level screening tool. It can be less accurate for athletes, older adults, pregnant women, and children, since it doesn't distinguish muscle from fat.

What should I do if my BMI is outside the "normal" range? BMI alone doesn't diagnose a health issue. If you have concerns, a doctor can take a fuller picture into account, including body composition and overall health.

Does this work for children's BMI? This calculator uses the standard adult BMI formula. Children and teens are usually assessed using age- and sex-specific growth charts instead, which this tool doesn't cover.

Does it work on mobile devices? Yes, it's fully responsive and works the same way on any mobile browser.

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