ChangeUnits is the original natural syntax unit conversion add-in for Excel. Unlike the built-in convert function from Microsoft, ChangeUnits understands virtually any combination of units and automatically checks to make sure each conversion is valid. ChangeUnits recognizes combinations of units just as you would write them no special formatting is required. Mix and match metric and standard English units. All conversions are automatically updated on-the-fly.

ChangeUnits is free and seamlessly integrates with all versions of Excel. Version 3.2 may include unspecified updates, enhancements, or bug fixes.