Unit and currency conversion

With a database driven website, it would be nice to allow transparent unit and currency conversions like

Height: 173 cm ≙ 5.67 foots

However, the available modules for Drupal don't as like advertised.'Unit Conversion Formatters' does not convert units 'currency' might work but does not document how.

So, sorry folks, no currency conversion. Units have to be entered in metric measures like cm or kg.