BMI Calculator for Adults
Calculate your Body Mass Index (BMI) and get personalized health advice based on NHS guidelines
⚠️ Important Information
You should not use this tool if you:
- Are under 18 years old
- Are pregnant
- Have been diagnosed with an eating disorder
- Have a condition that affects your height
This tool is for informational purposes only and should not be used to diagnose any symptoms. If you are worried about your weight, contact your local pharmacist or GP surgery.
Enter Your Measurements
People from Asian, Black African, African-Caribbean and Middle Eastern backgrounds have a higher risk of developing health problems at a lower BMI.
Calculating your BMI...
Your BMI Result
BMI Visualization
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Understanding Your BMI
What is BMI?
Body Mass Index (BMI) is a measure that uses your height and weight to work out if your weight is healthy. The BMI calculation divides an adult's weight in kilograms by their height in metres squared.
BMI Categories
Underweight: BMI less than 18.5
Healthy weight: BMI 18.5 to 24.9
Overweight: BMI 25 to 29.9
Obese: BMI 30 or more
Limitations of BMI
BMI is a useful measurement for most people over 18, but it's not perfect. For example, if you have a lot of muscle, you may be classed as overweight or obese despite having low body fat. This is why measuring your waist can give you a better idea of your overall health.
When to Seek Medical Advice
If you're concerned about your weight or BMI result, speak to your GP or practice nurse. They can provide personalized advice and support for managing your weight safely.