Pool Volume Calculator
Gallons in a rectangular pool.
Estimate how many gallons your rectangular pool holds — useful for dosing chemicals and sizing equipment.
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Pool gallons formula
For a rectangular pool: length × width × average depth = cubic feet, then × 7.48 to convert to gallons. Use your average depth, not the deep end.
FAQ
Why do I need the volume?
Chemical doses (chlorine, shock, algaecide) and pump/filter sizing are all based on total gallons.
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