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Pool Volume Calculator

Here is a great tool to calculate the volume or capacity of your pool. Important!
Remember to measure from the depth of the water rather than the height of your wall.

More complicated pool shapes will require multiple calculations and adding them together. For more detailed information on the calculations, read more below the calculator. For additional help, contact a swimming pool professional.

Capacity calculations involve calculating surface area and volume of the pool or spa. This article describes in detail how to calculate the size and capacity of the pool you are planning. Calculating a pool’s area in square feet is the first step in determining information including pool gallons, maximum capacity of persons and other important information about your pool.

Fill in the deep and shallow end depths:
If the same depth input value in both fields:

Calculate Pool Volume:
Deep End: feet
Shallow End: feet
calculator
US Gallons Liters
Select the pool shape and fill in the appropriate fields:
Rectangular Oblong
Rectangular Pool Shape
Length (A):
feet
Width (B):
feet
Oblong Pool Shape
Large Diameter (A):
feet
Small Diameter (B):
feet
Length (C):
feet
Circular Oval
Circular Pool Shape
Radius (R):
feet
Triangular Pool Shape
Length (A):
feet
Width (B):
feet
Standard In-Ground Pool Volumes in Gallons by Size
Pool Size
(in feet)
3.5 ft
Avg Depth
4 ft
Avg Depth
4.5 ft
Avg Depth
5 ft
Avg Depth
12×247,6008,6009,70010,800
14×2810,30011,80013,20014,700
15×3011,80013,50015,20016,900
16×3213,40015,40017,30019,200
18×3617,00019,40021,90024,300
19×3819,00021,70024,40027,100
20×4021,00024,00027,00030,000
22×4425,40029,00032,70036,300
25×4529,53133,75037,96842,187
25×5032,80037,50042,20046,900
30×5039,37545,00050,52556,250
Above Ground Swimming Pool Water Volumes in Gallons by Size
Size48in Wall52in Wall
12ft Round2,975 gals3,398 gals
15ft Round4,646 gals5,310 gals
18ft Round7,646 gals8,602 gals
21ft Round9,106 gals10,408 gals
24ft Round11,895 gals13,594 gals
27ft Round15,054 gals17,205 gals
30ft Round18,585 gals21,240 gals
33ft Round22,488 gals25,700 gals
12x24ft Oval5,948 gals6,797 gals
15x30ft Oval9,293 gals10,620 gals
16x32ft Oval10,573 gals12,084 gals
18x33ft Oval12,267 gals14,019 gals