This is a unit converter program written in Python, programmed by Joseph Nicholas. It has all the most commonly used units for length, temperature, pressure, mass, speed, energy, time, area, volume, power, and much more!

Download the stand-alone Unit Converter for Windows here: Unit Converter v2.3 [2.88 MB]

For Linux, Mac, and Windows, you can download the source here: Unit Converter v2.3 source [41 KB]
However you will also need to download and install Python and wxPython (both are free, make sure you install Python before wxPython).



Features:

• 13 categories so far: length, mass, speed, volume, energy, area, pressure, temperature, time, circular measure, power, metric prefixes, and number names (ex. million, billion, trillion, etc...).
• You can add and delete new custom units.
• Option to change the number of significant figures displayed.
• Units can be sorted alphabetically or by magnitude.
• Conversion is calculated as you type.
• The number of units displayed without having to scroll down is user-adjustable.
• Mathematical expressions and constants (ex 2*pi) are supported.
• Radians can optionally be shown in terms of pi.

• You can now add and delete custom units.
• Added microns, nanometers, and astronomical units to length.
• Added millibars to pressure.
• Added troy ounces and troy pounds to mass/weight.

• Added an option to diplay radians in terms of pi.
• Added deg-min-sec (degrees, minutes, seconds) to circular measure.
• Fixed a problem with division in user input.

• Added support for mathematical expressions and constants.
• Moved Settings and About buttons to menu bar.
• Windows XP themes now work.
• Now automatically restarts after settings are saved.
• Added a help button.
• Add 3 new categories: Power, Metric Prefixes, and Number Names (example: billion, trillion, etc...).
• Added megajoules, ergs, British thermal units, and electron volts to energy/work.
• Added gallons (UK), quarts (UK), pints (UK), and fluid ounces (UK) to volume.

• Completely redid the user interface.
• Added the ability to change the order the units are sorted in.
• Now rounds to significant figures instead of decimal places.
• Added the ability to change the default number of significant figures.
• Added a new category: circular measure.
• Added kilocalories to energy/work.
• Added pascals and kilopascals to pressure.
• Added knots and the speed of light to speed/velocity.
• Added fathoms and leagues to length.
• Fixed some errors in the conversion factors.

• Added kilometers per minute, kilometers per second, miles per minute, and miles per second to speed/velocity.

• The option to select the number of decimal places in the converted number.
• Added Area
• Added mach number to speed/velocity.
• Added Light Years and Parsecs to Length
• Added Months and Years to Time