We started the NHS BMI journey with a Flash tool for the nhs.uk website. It has since evolved into a fully responsive JavaScript tool and it remains the single most popular tool on nhs.uk with over a quarter of a million hits each month.

In 2011, we built an app version for iOS which, as well as performing BMI calculations for adults and children, offers tracking functionality. User profiles can be set up for each family member and for adults, there is a goal-setting functionality. With over 2,500 downloads a week, the app has become an effective tool in the nation’s weight management arsenal.

View tool on NHS Choices »