BMI calculator

Nice one! You are an ideal weight for your height. Want some healthy recipe inspiration to keep you on track? Check out our recipes here.

Your weight is above the ideal range for your height, but help is at hand. Find a Consultant near you and start moving back into that healthy weight range. If you need some success story motivation, read how dieters have achieved their goals with one-to-one support on our blog.

Your weight is above what is ideal and could increase your risk of health issues. Visit our How it works page to find out more about how The 1:1 Diet could help. Find a Consultant to get the support you need to get back to a healthy BMI range.

You are seriously at risk of health issues. Find a Consultant now for the help and support you need to get back to a healthy BMI.

Your BMI result places you within a weight category based on your height and weight. For most adults, a BMI between 18.5 and 24.9 is considered a healthy range, while a BMI between 25 and 29.9 is classed as overweight.

However, BMI can't distinguish between muscle and fat. This means someone with a muscular build may have a BMI within the overweight or obese category despite having relatively low body fat. Health risks may also occur at lower BMI scores for people from some ethnic backgrounds.

At your first appointment, your Consultant will explain what your BMI result means for you. They will also measure your waist, which can provide a better understanding of how much fat you carry around your abdomen and should be considered alongside your BMI.

A BMI between 18.5 and 24.9 is generally considered a healthy range for most adults. A BMI below 18.5 may indicate that you are underweight, while a BMI of 25 or above may suggest an increased risk of certain health conditions. However, BMI is only a screening tool and does not provide a complete picture of your health.

BMI is a quick and simple way to assess whether your weight falls within a healthy range for your height. It is widely used by the NHS, but it is only one measure of health.

BMI can't distinguish between muscle and fat or show where fat is stored in the body. It also does not account for ethnicity. People from some ethnic backgrounds may have a higher risk of certain health conditions, such as type 2 diabetes, at a lower BMI.

BMI is therefore best considered alongside other information, such as your waist measurement, medical history and overall health. Your Consultant will take your waist measurement at your first appointment and help you understand what your results mean for you.

To calculate your BMI, divide your weight in kilograms by your height in metres squared. Multiply your height in metres by itself, then divide your weight by this figure. Alternatively, simply use our BMI calculator above.

For adults, no. The BMI calculation and standard weight categories are the same for men and women.

For children and teenagers, BMI assessments consider age and sex at birth, as height, weight and body composition change throughout growth and development.

BMI is calculated in the same way for everyone, but ethnicity can affect how the result is interpreted. People from South Asian, Chinese, other Asian, Middle Eastern, Black African or African-Caribbean backgrounds may be at risk of developing weight-related conditions, including type 2 diabetes, at a lower BMI.