BMI Calculator
About BMI Calculator
Enter your height and weight to calculate your Body Mass Index (BMI) and see which category the result falls into — underweight (below 18.5), normal (18.5–24.9), overweight (25–29.9), or obese (30 and above). BMI is a widely used screening tool that relates weight to height, and the calculator supports both metric (cm/kg) and imperial (ft/lb) units. Useful as a quick health check, though it does not distinguish muscle from fat, so treat the number as a starting point rather than a diagnosis.
How To Use
- Enter the values the calculator asks for — amounts, dates, ratios, speeds, or grades.
- The result updates instantly as you type, with the working shown where it helps.
- Copy the answer, or adjust the inputs to compare different scenarios.
Example
Input: Two numbers, a couple of dates, or a ratio you want to work out.
Output: The computed result, with the breakdown shown where it helps you check the working.
Who Uses BMI Calculator
- Students and professionals who want private calculators with clear workings.
- Anyone doing everyday math without apps or data collection.
- People who prefer private — files and text stay on your device and are never uploaded to a server.
Frequently Asked Questions
What is a healthy BMI range?
For most adults, a BMI between 18.5 and 24.9 is considered the healthy range. Below 18.5 is classed as underweight, 25–29.9 as overweight, and 30 or above as obese.
How is BMI calculated?
For metric units, BMI = weight in kg ÷ (height in metres)². For imperial units, BMI = (weight in lb × 703) ÷ (height in inches)². This calculator handles both.
Is BMI accurate for everyone?
BMI is a useful screening tool but it does not distinguish muscle from fat, so very muscular athletes can score "overweight" while carrying little fat. Treat it as a starting point, not a medical diagnosis.
Should I use metric or imperial units?
Either works — the calculator supports centimetres and kilograms or feet/inches and pounds and converts correctly between them.