WordPress.org

Features

1. It can convert between 144 world currency formats.
2. The conversion rates are fetched in real-time from Yahoo! Finance prior to every calculation.
3. It employs an AJAX back-end, i.e. the conversions are performed without having to refresh the whole page, making the tool really lightweight & fast. Looks cool too.
4. Performs client-side validation of the amount entered - thus cutting out chances of entering an erroneous value and crashing the calculator midway while performing a conversion.