BMI Calculator
BMI is a general estimate and does not account for muscle, age or body composition. It is not medical advice.
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Enter your height and weight to get your Body Mass Index (BMI), the WHO weight category it falls into, and the healthy weight range for your height. Works in metric or imperial units. This is a general estimate, not medical advice, and runs entirely in your browser.
How to use
- Choose metric (cm, kg) or imperial (in, lb) units.
- Enter your height and weight.
- Read your BMI, its category and your healthy weight range.
How it works
BMI is your weight in kilograms divided by the square of your height in meters (kg/m2). The World Health Organization groups the result into ranges: under 18.5 is underweight, 18.5 to 24.9 is normal, 25 to 29.9 is overweight, and 30 or more is obese. The healthy weight range is simply the weights that give a BMI between 18.5 and 24.9 for your height.
Features
Instant BMI
See your body mass index update as you type your height and weight.
WHO category
A clear label shows which standard weight category your BMI falls into.
Healthy weight range
See the weight range that corresponds to a healthy BMI for your height.
Metric & imperial
Switch between centimeters/kilograms and inches/pounds instantly.
When to use it
After a check-up
Quickly see where your weight sits on the standard BMI scale.
Starting a diet
Get a baseline figure and a target healthy weight range to aim for.
Tracking progress
Recalculate over time to see how your BMI changes.
Setting goals
Use the healthy weight range to set a realistic target weight.
Notes
- BMI does not distinguish muscle from fat, so athletes may read high.
- It is not suitable as-is for children, pregnancy or the elderly.
- Treat the result as a rough guide, not a diagnosis.
- All calculation runs on your device; nothing is uploaded.
Not medical advice
This calculator provides a general estimate of body mass index for information only. It is not a substitute for professional medical advice, diagnosis or treatment. Consult a qualified healthcare provider about your health.
FAQ
- What is BMI?
- Body Mass Index is a simple ratio of weight to height (kg/m2) used to categorize weight into ranges. It is a quick screening tool, not a direct measure of body fat.
- What is a normal BMI range?
- By WHO standards, a BMI of 18.5 to 24.9 is considered normal weight. Below that is underweight, 25 to 29.9 is overweight, and 30 or above is obese.
- Why might a muscular person read high?
- BMI counts all body mass, so muscle adds to it. Very muscular people can have a high BMI while having low body fat, which is a known limitation.
- Can I use it for children?
- Not directly. Children and teenagers use age- and sex-specific BMI percentiles, so consult a pediatric chart or doctor instead.
- Is my data sent to a server?
- No. The calculation happens entirely in your browser and nothing is uploaded.