archCalc is a mixed unit decimal and fraction calculator.
It allows one to enter dimensions in standard english and metric units of measurement, perform basic calculations, convert between units, keep track of a series of operations, and easily solve for a leg or slope of a right tiangle.

Unit Conversion Software for Windows to easily convert between 673 units in 31 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, Viscosity and more. Includes Log of conversions, clipboard support, integrated help, printing, full customization and much more.author_notes=ESBUnitConv Pro is Unit Conversion Software for Windows to easily convert between 673 units in 31 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 Accelertation, Computer Storage, Data Rates, Dynamic Viscosity, Kinematic Viscosity, Electric Charge, Electric Curreny and Radioactivity. Includes Log of conversions, Scaling, Value Swapping, Clipboard Support, integrated help, printing, full customization and much more. The Primary SI Unit in each measurement category is displayed bold, and buttons are supplied to quickly select it. Tools include American Wire Gauge (AWG) Table, Circle Calculator and Sphere Calculator.

Units can be hidden if there are some you do not want to have.

Users can also choose between English International (Default) and English (US). Optimized for Windows XP/Vista in 800×600 (or better) and 32-bit colour. Works well with Windows Vista

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.

ChangeUnits is a free Excel ‘add-in’ for units conversion that performs all conversions directly within Excel, eliminating the need for a separate units conversion application.
ChangeUnits works with combinations of common units just as users would write them, performing multiple conversions in a single step.