Hi Mal,
We're happy you like Formulaic!
There's a straight forward way to change the units. Lets start with
your equation, and rename the volume variable:
volume_metric = (dia/2/1000)squared * PI * velocity * 3600
Based on your conversion to "imperial": volume_imperial =
volume_metric / 1.7
Substituting that into the original equation yields:
volume_imperial * 1.7 = (dia/2/1000)squared * PI * velocity * 3600
The expressions on either side of the equals sign can be as extensive
as you like, including variables, constants, operations, etc.
Best regards,
CK @ Hoy Moon