CAD tip # 8365:

The default units (for metric environments) are millimeters, but you can set different default units for the current document - e.g. inches - see the ribbon Tools > Options > Document settings > Units.

But Inventor understands many more units. Dimension values in other units can be used in any expression - just add the respective suffix to the value. A special case is the unit "ul" (unitless), which can be used e.g. in multiplication and division expressions (10 mm / 2 ul = 5 mm).

Inventor understands e.g. these well-known (SI) and less-known measurement units and prefixes - try yourself:

Metric:

• m - meter
• mm - millimeter
• cm - centimeter
• dm - decimeter
• km - kilometer

• dam - dekameter (1E+1)
• hm - hektometer (1E+2)
• Mm - megameter (don't confuse with "mm"!)
• Gm - gigameter (1E+9)
• Tm - terrameter (1E+12)
• Pm - petameter (1E+15)
• Em - exameter (1E+18)
• am - attometer (1E-18)
• fm - femtometer (1E-15)
• pm - picometer (1E-12)
• nm - nanometer (1E-9)
• microm - micrometer (1E-6)
• micron - micron

Imperial:

• in - inch
• ft - foot/feet
• yd - yard
• mile - mile
• cin - centiinch (1E-2)
• microin - microinch (1E-6)
• nin - nanoinch (1E-9)
• pin - picoinch (1E-12)
• kin - kiloinch (1E+3)
• Min - megainch (1E+6)
• Gin - gigainch (1E+9)
• Gft - gigafoot (1E+9)
• Gyd - gigayard (1E+9)

Angles:

• deg - degree
• grd - grad (100)
• rad - radian