Converter+ is a really cool app for converting just about anything. Length, mass, temperature, time, whatever it is, the app will convert it. And it even has tip and mortgage calculator. There is a short list of favorites which can be expanded further to any value you may require. For a person like me, who travels all around the world, this is a must have app. Converter+ is a free app, however if you want to get rid of the ads, you can upgrade to a pro version.