Volume reference

Pool Volume Chart: Common Pool Sizes in Gallons

Use this pool volume chart to estimate gallons for common round and rectangular pools. It uses cubic feet x 7.48 gallons and should be checked with the volume calculator for custom shapes.

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Reference chart

Common values for quick planning.

These values are for planning and checking mental math. Use the matching calculator when your pool size, product strength, target range, or current test reading differs.

Pool shape	Dimensions	Avg depth	Estimated gallons
Rectangle	12 x 24 ft	4.5 ft	9,694 gal
Rectangle	16 x 32 ft	4.5 ft	17,234 gal
Rectangle	18 x 36 ft	5.0 ft	24,235 gal
Round	18 ft diameter	4.0 ft	7,614 gal
Round	24 ft diameter	4.5 ft	15,227 gal
Round	30 ft diameter	4.5 ft	23,793 gal

How to use it

Treat chart numbers as a first pass.

Pick the closest pool size, check the matching column, then compare that number with your current test result and product label. If the adjustment is large, use the calculator and add in stages.

Pool volume errors multiply every chemical estimate. If the pool size is uncertain, use the volume calculator before relying on a dosing chart.

Reference FAQ

How to use this chart without overcorrecting.

Use chart values to orient the next step, then rely on fresh test results, calculator inputs, and product labels before adding chemicals.

Should I use this pool volume chart or the calculator?

Use the chart for a quick estimate and the calculator when you know the actual dimensions, average depth, or shape.

Why does average depth matter?

Chemical dosing depends on total water volume. A pool with a deep end should use average water depth, not just the deepest point.

Does the chart include steps or tanning ledges?

No. Large shallow areas can change true volume and should be estimated separately when accuracy matters.

Can I use chart gallons for pump sizing?

Yes as a starting point, but pump sizing also depends on turnover time, equipment limits, plumbing resistance, and pump curves.