Key:
* is multiply
^x is raised to the x power
The format is as follows (much of this is from inovativefunctions.com):
Initial_units / Desired_units / Multiply_by
acres/square
feet/43560
acres/square
miles/1.562*10^-3
ampere-hours/
coulombs/3600
angstrom units/
inches/3.937*10^-9
astronomical unit/
kilometers/1.495*10^8
atmospheres/
centimeters of
mercury/76
kilopascals/pounds per square inch/0.145
kilowatts/foot-ponds per second/737.6
kilowatts/
horsepower/1.341
kilowatt-hours/
BTU/3413
knots/feet per hour/6080
knots/
statute miles per hour/1.151