This plugin hasn’t been tested with the latest 3 major releases of WordPress. It may no longer be maintained or supported and may have compatibility issues when used with more recent versions of WordPress.



Why Units?

Units provides your users with an intuitive way to choose and display their preferred unit of measurement. The user’s preferred unit of measurement is saved via session, cookie, or none – configurable under the plugin settings.

Any number of primary/alternate units can be added, along with their conversion formulas.

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Using Units

Add primary units under Settings > Units. Alternate units may be added by providing their name and conversion formula. Multiple alternate units may be added for each primary unit.

Use the function unit_switcher($value, $primaryunit, $round) in your template to display the switcher. Pass the stored value as the first parameter and primary unit of measurement as the second value.

To display a single switcher, the shortcode [unit_switcher] is available for use. The shortcode requires two parameters: unit (the primary unit being converted) and value (the stored value).

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Important: Unit Switcher requires WordPress version 3.8 or higher, and PHP version 5.3.2 or higher.

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Using the Template Function

unit_switcher($variable, $primaryunit, $round);

* $variable – The stored value (integer or float)
* $primaryunit – The primary unit (the stored value should be stored in this unit)
* $round – Number of digits to round to (default is 2)

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  • Display a dropdown method for users to toggle between units of measurement.

  • Optionally save the user’s preference via the session or cookie.

  • Add as many units/alternate units as needed.


  1. Upload unit-switcher to the wp-content/plugins/ directory
  2. Activate the plugin through the Plugins menu in WordPress
  3. Visit the plugin settings to add units of measurement
  4. Use the unit_switcher() template function or [unit_switcher] shortcode to display the switcher


Is this plugin WPML compatible?

The plugin is not yet WPML compatible.

How do I add a unit of measurement?

Visit Settings > Unit Switcher. A primary unit of measurement is required, along with at least one alternate unit. Substitute the primary unit with X in the formula to equal the alternate formula. So, to set an alternate unit of inches for a primary unit of feet, the formula should be set to X*12.


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Contributors & Developers

“Units” is open source software. The following people have contributed to this plugin.


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Interested in development?

Browse the code, check out the SVN repository, or subscribe to the development log by RSS.



  • Bug fix – conflict with Bootstrap Javascript libary resolved.


  • Page caching conflicts resolved. If using a page cache plugin, visit Settings > Unit Switcher to enable the fix.
  • Minor bug fixes in options saving


  • Initial release