Where are you on the global fat scale?
The new BBC calculator can tell you if you are a healthy weight for your height and how you rank against others globally.
Using your age, sex, nationality, height and weight, it will come up with a number representing your Body Mass Index or BMI.
This is a measure doctors use to gauge obesity.
The app plots your BMI and shows how you compare to people from your own and other nations.
Researchers see global weight gain as a bigger threat to mankind than population growth.
As well as the health implications, experts are also concerned about the environmental impact.