"Ben Griffin" wrote in message
o.com...
How do you calculate the volume of a round container.
I should know this so im feeling a little stupid.

I think the formula is V=Pie r "squared" times the
height

But some of the online stores are saying an 8 inch by
8 inch round pot is two gallons and with that formla i
get something around 1.75 gallons. So im figuring i
must have the formula wrong....

Your formula is correct (excluding whatever unit conversion you
used to convert from cubic inches to gallons). I can only guess
that nurseries use smaller gallons than the rest of us ;-)