OC Conversion Pro 

OC Conversion Pro is a powerful and great converter, it supports a huge amount of converting options. The customized math parser the program uses allows for much better accuracy than found on the site. Up to 15 decimal places, fewer rounding errors, even the ability to use Scientific Notation for very large or very small numbers.

Currency Exchange Rates are updated every business day and new units are added to the main data file on a ongoing basis. Now all you need to keep updated is an internet connection, then simply click on the Update menu option.