About 89.8 US gallons.
A 12-foot wide round pool with 3.3 feet of water contains 2,803.7 gallons of water.
22.44 gallons for each inch of the water's depth.
Three feet of water in a 12-foot round pool is about 2,550 gallons.
This pool can hold up to 1,689.7 gallons of water.
The pool holds approximately 10,560 gallons of water.
29,610.94 gallons (rounded)
1,269,551.02 US gallons.
4 X 12 X 40 = 1920 cubic feet of water. 1 cubic foot of water = 7.48 gallons. 1920 cubic feet of water = 14,362.5 gallons
615,142 gallons of water are needed to fill this cylinder.
There are about 7.481 gallons per cubic foot. So if your 12 foot by 8 foot pool is filled 4 feet deep you will need 12 x 8 x 4 x 7.481 = 2,873 gallons of water.
Do you mean a cylinder with a diameter of 5 feet and length of 12 feet? This would hold about 235.6 cubic feet or 1762.5 gallons
89.76 gallons.