Measurement Conversion is a powerfull WordPress plugin designed especially for cooking sites with recipes. It will help your visitors to quickly convert measurements of the recipe’s ingredients without leaving your page. With a simple click on the unit, the user can choose a different unit to which the value can be converted to.
As a bonus, there is a small standalone converter which you can insert anywhere on your site, to let your visitors make their own conversions.
Covered units:
– weight: kg, g, lb, oz
– volume: litre, ml, cup, tablespoon, teaspoon, pints, fl oz
– temperature: Celsius, Fahrenheit
It uses Google API for the conversions through AJAX calls.
Be friendly with all your visitors, no matter from where they are or what metric system the use 
CHANGELOG
August 14th, 2013: Fixed “lost decimals” bug
September 21th, 2013: Added button to tinyMCE visual editor for easier shortcode insertion
Planned for next updates:
– Full internalization support