General Reference: Unit Conversions
 

Found a non-US website with metric measurements of power and torque, and want to know what its equivalent in HP and ft/lb is? Use the following page! :D

http://www.onlineconversion.com/

FIVE YEAR BUMP!!

One can also just use Google in this day and age

Example queries (without the quotes): '1000kg to lbs'
'1USD to CAD'

It does mass, volume, power, electrical, currency, and much more.