Units! - More than a thousand units at your fingertips.

 
Whatever you do, there are just too many units of measurement to remember them all. Units! makes unit conversion easy.
As if that were not enough, Units! converts currencies as well - with daily currency updates.
 
Units! can convert measurement from these Categories:
 

Absorbed Energy		Electrical power	Radioactivity
Accelleration		Energy	Radioactive Exposure
Amount of substance		Force	Roentgen Equivalent in Man
Angle		Frequency	Temperature
Area		Inductance	Time
Currencies		Length	Torque
Data Transfer Speed		Luminous intensity	Velocity (angular)
Data Volume		Magnetic field	Velocity / Speed
Density		Magnetic flux	Velocity of Volume / Volume Speed
Electric capacitance		Magnetic flux density / induction	Voltage / Potential difference
Electric charge		Mass, Weight	Volume
Electric conductance		Moment of Inertia
Electric field		Power
Electrical impedance, resistance		Pressure