According to this map (click on it for more information), there are now only two countries in the world that haven’t adopted the metric system: Myanmar/Burma and the US.
It’s a bit strange to see that the UK has been allowed the colour blue – perhaps they should have assigned a different colour to countries that have changed over officially, but where people still use different units in practice.
I just wish there was a way to make the US go metric, too – so long as the largest English-speaking country is using imperial measures, it will be really hard for the UK to let go completely.