ExtendUnits Package

The ExtendUnits package facilitates unit converstions. Units should be considered as part of the data for a calculation and as such are best entered only at the end of a derivation or calculation when data values are also substituted. Then, using approximate numbers, it is possible to provide many routines, useful in practice that are not provided by the standard Units package alone. The ToUnit routine can be used as a postfix command and applies to a wider class of expressions than Convert does. It has a PrefixForm which will automatically generate the correct SI prefix. It allows conversion to multiple compatible units at once. It allows compatible descending units to be parsed, such as 2 Hour + 31 Minute + 32.03 Second. It allows real number conversion to Degree. It allows unit expressions to be deunitized with controlled implied units for use in plotting and numerical routines. The ReducedUnits commands allow the implementation of reduced unit systems such as geometrized units in relativity or atomic units in atomic theory. In addition to regular Mathematica units, the users can install their own units.
A copy of the installation instructions is also included in the downloaded zip file.

Conversion to and from Decibel units added.

The Version 6 package now has paclet documentation and an ExtendUnits palette that also covers the Units and PhysicalConstants packages.

There is a Mathematica Version 6 package and a Mathematica Version 4.0 through Version 5.2 package. One purchase gets you either or both.

Download
ExtendUnits Version 4.0-5.2 Installation Instructions 2KB, 1 Nov 2005.
ExtendUnits Version 6.0 Installation Instructions 2KB, 19 May 2007.
Purchase ExtendUnits Package $30,
Pre-Version 6: 106KB Packages and Documentation, 16 Sep 2006;
Version 6+: 719KB Packages and Documentation, 10 Mar 2011

There was a change in the Standard Mathematica Units package with Version 4. If you have pre Version 4 Mathematica you will have to use the following package instead. It is free, has a tutorial notebook but no Help browser pages. The Version 3 packages should be placed in the AddOns/ExtraPackages/Miscellaneous directory.

Download
V3UnitsTutorial.nb 100KB Mathematica Notebook. 8 Sep 1999
V3ExtendUnits.m 26KB Mathematica Package. 30 Jul 1999
V3ReducedUnits.m 6KB Mathematica Package. 8 Sep 1999