The DSA is a voluntary, nonprofit education
corporation, organized for the conduct of
research and education of the public in the
use of dozenal (also called duodecimal or
base-twelve) in calculations, mathematics,
weights and measures, and other branches of
pure and applied science.
Billing itself as "the world's first," this converter provides a dead-simple interface for converting decimal numbers to dozenal and vice-versa. Very easy to use and available anywhere you have access to the Web.