The calculator I always wanted

[john gustaf stebbins]

Having units will be very useful.

Is there a way to be able to build units that I need?

I use micrograms per square decimeters in my work. That is not there (not surprising), but not even micrograms or decimeters. The Prime has the prefixes supplied as essentially separate units so you can build any SI combined unit.

In your example you have gallons per minute. Is that just by dividing 1 gallon by 1 minute then multiplying by 100?

A function to gather the units could be helpful. Is this part of the Symja engine? Maybe a set of functions could be enabled in the catalog if they already have some of this.