From ESB Consultancy:
ESBUnitConv Pro is an Enhanced user-friendly Windows Utility to easily convert between 758 units in 36 different measurement categories. Includes Units for Temperature, Distance, Mass, Area, Volume, Pressure, Velocity, Acceleration, Force, Energy, Power, Fuel Consumption, Flow, Torque, Angles, Time, Illumination, Luminous Intensity, Luminance, Luminous Flux, Density, Angular Velocity, Angular Acceleration, Computer Storage, Data Rates, Dynamic Viscosity, Kinematic Viscosity, Electric Charge, Electric Current, Magnetic Flux, Magnetic Flux Density, Quantities, Radiation Absorption, Radiation Dose & Radioactivity.
Include the ability to log conversions, print, improved clipboard support, integrated help and much more. Also support for Exponential Notation in conversions and in the pop-up calculator. Special support included for SI Units, American Wire Gauge Table, Circle Calculations and Sphere Calculations. Also includes the ability to hide units if you don't want them. Unit Conversion Software that is useful and educational. Registered version also includes Portable Version for Removable/Portable Drives, Electronic Documentation and PDF designed to produce Printed Documentation. Register only once for the life of the product. Also available as part of the ESBCalc Pro Suite.