GD Unit Converter is our new and free plugin that adds simple to use administration dashboard widget for converting values for currency, time, speed, length, temperature and more between different units. More categories and units for conversion will be added in future versions.
As you can see from the image above, widget is very simple and easy to use. Conversion will happen automatically as you type or change units, except for currency. Currency conversion needs to make AJAX call back to the website to get exchange rate. Exchange rate source is Google, and once we get the rate, it will be stored for 24h. While the exchange rate is valid it will be used from cache, when 24h expire, it will be retrieved again from Google. So, to minimize calls for currency, to make a conversion you must always click on TO button. All other categories will be converted directly.
You can download plugin for free from Dev4Press website, or from WordPress.org plugins repository.
Dev4Press Home: http://www.dev4press.com/plugins/gd-unit-converter/