How many gallons will a round tub hold - diameter 41" height 12"

Question

What is the formula for finding the number of gallons. I want to advertise a preformed pond and need to know how many gallons it will hold.

Answer 1

rite-serkular cylinder (base=serkel) diameter=41inch, hite=12 inch=1 foot

volume=hite*base area=hite*pi*r*r

=12inch*20.5*20.5*3.141592654...20.5^2=420.25; 12*420.25=5043

times pi...volume=15843.051...kubik inches

1 ft=12 inch, so 1 kubik foot=1728 kubik inch

15843 /1728=9.1684 kubik ft

1 kube foot=7.480681 gallon, so 9.1684*7.48068=68.585896 gallons

or bout 68.6 gallons