Pool Volume Calculator — Calculate Gallons in Your Pool

Length (ft)Enter a valid length.

Width (ft)Enter a valid width.

Average Depth (ft)(Shallow end depth + deep end depth) ÷ 2Enter a valid depth.

Total Pool Volume

—

How to Use This Tool

Enter your pool's length and width.
Enter the average depth — (shallow end + deep end) ÷ 2 for a sloped pool.
Click Calculate for total gallons.

The Pool Volume Formula

Volume (gallons) = Length × Width × Average Depth × 7.48

This uses 7.48, the number of gallons in one cubic foot, to convert your pool's volume in cubic feet to gallons.

Calculating Average Depth for a Sloped Pool

For pools with a shallow and deep end, average depth is simply the shallow depth plus the deep depth, divided by 2 — this works well for pools with a fairly consistent, gradual slope.

Why Pool Volume Matters

Chemical dosing: Chlorine, pH adjusters, and other pool chemicals are dosed based on total water volume
Fill time estimates: Combined with your hose or fill rate, volume tells you how long filling will take
Heater and pump sizing: Equipment is often sized relative to total pool volume

Frequently Asked Questions

Does this work for irregularly shaped pools?

This calculator is designed for rectangular pools. For freeform or irregularly shaped pools, you'd need to break the shape into approximate rectangular/circular sections and sum their volumes separately.

How do I calculate average depth for a pool with a deep end?

Add your shallow end depth and deep end depth together, then divide by 2 — this works well for pools with a consistent, gradual slope between the two depths.

This calculator is provided for general informational and estimation purposes only. Results should not be treated as professional financial, tax, legal, medical, or engineering advice. Always verify critical calculations with a qualified professional or official source before making decisions.