That would depend what shape and how deep the pool is.
If it is a round pool, 18 feet across and 4 feet deep, you would have 1000 cubic feet (pi R squared D), which is 28,300 liters.
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To calculate the volume of water in an 18ft pool, you need to know the depth as well. Once you have both the length and width dimensions in feet, you can use the formula: Volume = length x width x depth. Then convert the volume into litres (1 cubic foot = 28.317 litres).
Liters (L) is the best metric unit to measure the amount of water in a pool as it provides a convenient measurement for large volumes of liquid.
Cubic meters or cubic feet are commonly used units to measure the volume of water in a rectangular pool.
There are 7,985.76 gallons of water in a 1799.5 cubic feet pool.
This depends on many factors.
A pool measuring 10'x15'x52" holds approximately 3,944 gallons of water.