Units is a really useful free app that lets you easily convert from various units into lots of others.

Units can convert hundreds of units from 43 different categories including Speed, Time, Length, Volume, Area, Power, Temperature, Fuel Consumption, Shoe Sizes and loads more!

Units is a fully universal app with native support for iPhones, iPod touches, and iPads.

• Convert hundreds of units - Units has over 800 units across 43 different categories.
• Convert currency - Units can convert between 88 different currencies, with rates updated daily.
• Hide unused units - Units lets you hide units you don't use, allowing you to maintain a streamline conversion workflow.
• Reorder both units and unit categories to suit your needs.