Pool Volume Calculator
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Pool Volume Calculator
Find Out How Many Gallons Your Pool Holds
Pool Dimensions
Pool Volume
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gallons
Volume (Cubic Feet)
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Enter your pool's dimensions to see the volume.
Validation Error
Enter valid, positive dimensions.
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Understanding Pool Volume
Knowing your pool's volume in gallons is essential for dosing chemicals correctly, sizing a pump or filter, and estimating how long it takes to fill.
Rectangular Pools
Volume (cubic ft) = length × width × average depth, then × 7.48 to convert to gallons.
Circular Pools
Volume (cubic ft) = π × radius² × average depth, then × 7.48 to convert to gallons.
Use an Average Depth
For pools with a shallow and deep end, average the two depths -- (shallow + deep) ÷ 2 -- for a reasonably accurate volume estimate.
Why Gallons Matter
Chlorine, pH adjusters, and other pool chemicals are dosed per thousand gallons -- an accurate volume keeps your water balanced.
Worked Examples
Rectangular: 20ft × 10ft × 5ft avg depth
- 1,000 cubic ft × 7.48 = 7,480 gallons
Circular: 24ft diameter × 5ft avg depth
- ≈2,262 cubic ft × 7.48 ≈ 16,919 gallons
Key Takeaways
- 7.48 Gallons Per Cubic Foot: The standard conversion factor for water volume.
- An Estimate: Pools with sloped bottoms or irregular shapes will vary somewhat from this formula.
- Recheck After Changes: Recalculate if you add a shallow ledge, change the water level, or resize the pool.