Unios is a fast and simple unit converter with built in support for lots of units in many categories including currency, capacity, distance, pressure, speed, temperature, surface area, time, volume, and weight. If you need to work with units that aren't on the list, Unios is flexible enough to let you define your own. Unios includes two proportion solvers to help you perform quick conversions between two units with a known relationship to one another or to a third, common unit.