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.
13,009.5 gallons.
7361.304
This pool holds a maximum of about 10,360 gallons of water.
About 13,010 gallons.
You will need a maximum of 11,230 gallons of water.
10,408 US gallons.
21 inches of water in a round pool that is 27 feet 3 inches across is about 7,667 gallons.
About 11,708 gallons.
A 21' pool that is 48" high should have 10,407 gallons of water (approx). To calculate the gallons in a round swimming pool use this formula: Length x length x average depth x 5.9 = gallons of pool So in your case 21 x 21 x 4 x 5.9 = 10,407 gallons
you've got to be kidding
10,408 gallons.
This question cannot be answered without more information. Does 21 foot refer to the length of a side of a square or rectangular pool, the radius or circumference of a circular pool? Is the pool of some other shape? What is its depth?
1 - There are 7.481 gallons per cubic foot. 2 - The volume of the pool in cubic feet is: Pi*5*(21/2)**2 = 1,731.8 3 - Therefore the number of gallons is: 7.481*1,731.8 = 12,955.62
If you fill it to four feet deep, the total is 10,408 gallons of water.