How many gallons of water would a 120 X 72 X 22 pool hold?

Correct me if I'm wrong... Length in metres x width in metres x depth in metres = cubic meter capacity 1 cubic meter = 1000 litres 1 imperial gallon = 4.54609188 litres 1 US gallon = 3.7854118 litres e.g. a 25m pool with a width of 5 meters and depth of 2 metres = 25 x 5 x 2 = 250 cubic metres 250 x 1000 = 250 000 litres! Therefore: 250 000/4.54609188 = approx. 54992.29 gallons of the UK variety or... 250 000/3.7854118 = approx. 66043.01 gallons of the US variety This becomes more complicated where the pool has varying depth. For that the pool will need to be split into sections and the capacity of each section added together.