Just how large is a large soda? How McDonald's cup sizes vary across the globe - with a British 'large' the same as a US 'medium'

A medium-sized drink from any McDonald's in the U.S., which contains 21oz of liquid, is an ounce more than Japan's large-sized drink. And America's large size (30oz) is approximately 1.5 times bigger than the one in Japan (20oz). In Australia, a small beverage from McDonald's is just about the same size as a small from the U.S., but a medium-sized one is significantly shorter - just minimally bigger than Australia's small.