Quote:
Originally Posted by robbomberbomyea
thanks for the input,think ill give it a try,plan on 3 1/2" x 20" wanting to hold close to gal.i think the formula is dia x dia x length gives the cubic vol... and 321 cu.in = 1 gal i think thats the way to fig.thanks again

Almost! The formula for volume of a cylinder is pi(r^2)l so that would be 3.14(1.75^2)20 = 192.4 cubic inches