ESBUnitConv provides you with a portable option for numerous types of measurement conversions.

We have it marked Freemium because there is a pro version that you can upgrade to which offers approximately 400+ additional units. But the free version will suffice for most users as it covers 613 Units in 21 different measurement categories.

ESBUnitConv is very user-friendly permitting you to convert between units of measurement easily. It includes Units for Temperature, Distance, Mass, Area, Volume, Pressure, Velocity, Acceleration, Force, Energy, Power, Fuel Consumption, Flow, Torque, Angles, Luminous Intensity, Illumination, Time, Quantity & Radioactivity. It is an older app, but the conversions check out and operation is smooth. Even if you don't upgrade, the free version is fully functional and extremely simple to use.