BMI calculator
Use this free BMI calculator to check your Body Mass Index using kg or stone, and cm or feet and inches.
Free Body Mass Index calculator
This BMI calculator helps you estimate your Body Mass Index based on height and weight. BMI is a simple screening measure that compares weight to height. It can be useful for tracking changes over time, but it does not account for muscle mass, body composition or individual health factors. Use it as a guide and speak to a professional for personalised advice.
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Calculate your BMI
Enter your weight in kilograms.
You can use stone and pounds too.
Enter your height in centimetres.
You can use feet and inches too.
Your BMI: –
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BMI calculator FAQs
What is BMI?
BMI stands for Body Mass Index. It is a simple calculation that uses your height and weight to estimate whether your weight falls within a typical range for your height.
What are the BMI categories?
Common adult BMI categories are: underweight (below 18.5), healthy weight (18.5 to 24.9), overweight (25 to 29.9), and obese (30 or above).
Is BMI always accurate?
BMI is a useful screening tool, but it does not measure body fat directly. Athletes and muscular people may have a high BMI without having excess body fat. BMI also does not consider age, sex, or body composition.
Can I use this BMI calculator for children?
BMI for children and teenagers is interpreted differently and uses age and sex-specific charts. This calculator is intended for adults.
How can I improve my BMI?
If you are concerned about your BMI, consider speaking to a healthcare professional. Small changes such as improving diet, increasing activity, and building sustainable habits can help over time.
This free BMI calculator is a quick way to check Body Mass Index using either metric or UK-friendly units. You can enter weight in kg or stone, and height in cm or feet and inches.
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