Cannot be answered with only these measurements. You need to specify what shape the pool is. Also, for a rectangular pool, the length, width and depth are needed. For a round pool, the diameter and depth are needed.
If the depth is 6-ft everywhere ... no deeper places or shallower places ...then the volume is18' x 36' x 6' = 3,888 cubic feet3,888 cubic feet = 29,084 gallons (rounded)That's the volume of the pool, up to the rim. I haveno way to know how much water may be in it.
If the pond is uniformly 6-feet deep it would contain about 1,955,109 gallons of water.
how many gallons of water does a swimming pool 15 feet by 4 feet deep hold
17,953.2 gallons
250 ft3 = 1870.13 US gallons
The pool holds approximately 10,560 gallons of water.
24,685.79 gallons
1,770 gallons.
6,200 gallons.
5,974 gallons.
3,398.4 gallons.
20000