BMI Requirements

BMI Calculator

Use our BMI calculator to check your eligibility for prescription weight loss treatments available in the UK.

Your BMI
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18.5 25 30 40

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Your Weight Loss Tools

Free, easy-to-use calculators to help you understand your BMI, daily calorie needs, and eligibility for prescription weight loss treatments available in the UK.

Understanding BMI

Body Mass Index (BMI) is a measure that uses your height and weight to work out if your weight is healthy.

A BMI under 18.5 indicates you may be underweight. This could mean you're not eating enough or may have an underlying health condition. Speak with your GP for advice.

A BMI between 18.5 and 24.9 is considered a healthy weight range. Maintaining this range through balanced nutrition and regular activity supports overall wellbeing.

A BMI between 25 and 29.9 indicates you may be overweight. Small lifestyle changes like healthier eating and increased activity can help you reach a healthier weight.

A BMI between 30 and 34.9 indicates obesity class I. This increases your risk of serious health conditions. Your GP can provide support and treatment options.

A BMI between 35 and 39.9 indicates obesity class II. This significantly increases health risks. Medical support and treatment options are available through your GP.

A BMI of 40 or above indicates obesity class III. This carries the highest health risks. Speak with your GP about treatment options including medication and specialist support.

  • 📋 Medical Information Notice

    MedEazy provides general health information to help you make informed decisions. The tools on this page — including BMI calculators — are for reference only and do not constitute medical advice. Always consult a qualified GP or healthcare professional before beginning any weight loss programme.
FAQ

Quick answers

  • ody Mass Index (BMI) is a simple measurement that estimates whether your weight is healthy for your height. It is calculated by dividing your weight in kilograms by your height in metres squared. BMI is commonly used as a screening tool to identify potential weight-related health risks in adults.
  • For most adults, a BMI between 18.5 and 24.9 is considered within the healthy range. A BMI below 18.5 may indicate underweight, while a BMI between 25 and 29.9 is classed as overweight. A BMI of 30 or above is generally considered obese. These ranges are guidelines and may not apply equally to everyone.
  • BMI is a useful general indicator, but it does not directly measure body fat or overall health. Factors such as muscle mass, age, ethnicity, and body composition can affect results. For example, athletes may have a higher BMI due to increased muscle rather than excess body fat.
  • Checking your BMI can help you understand whether your weight may increase the risk of health conditions such as heart disease, type 2 diabetes, and high blood pressure. It can also be a useful starting point for discussing your health goals with a healthcare professional.