Pool Volume Calculator
Calculate pool volume in cubic feet, gallons, and liters.
This pool volume calculator finds the total water volume of a swimming pool in cubic feet, gallons, or liters, based on the pool's length, width, and average depth - a key figure for chemical dosing and fill-time estimates.
Enter your pool's dimensions, and the calculator returns its total volume.
Worked Calculation Examples
| Scenario | Result | Calculation Step |
|---|---|---|
| 30 ft × 15 ft pool, 5 ft average depth | ≈16,831 gallons | Volume = 30 × 15 × 5 × 7.48052 ≈ 16,831 gallons. |
| 20 ft × 10 ft pool, 3 ft shallow / 8 ft deep end | ≈8,229 gallons | Average depth = (3 + 8) ÷ 2 = 5.5 ft. Volume = 20 × 10 × 5.5 × 7.48052 ≈ 8,229 gallons. |
The Pool Volume Formula
Volume (gallons) = length x width x average depth x 7.48052, where 7.48052 converts cubic feet to gallons. For pools with a shallow and deep end, average depth = (shallow depth + deep depth) / 2, used in place of a single uniform depth measurement.
Why Accurate Volume Matters for Pool Chemistry
Chemical dosing instructions for chlorine, pH adjusters, and other pool treatments are based on total pool volume - underestimating volume leads to under-treatment (algae or bacteria risk), while overestimating leads to over-treatment (chemical waste or water quality issues), making an accurate volume calculation important beyond just curiosity.
How to Use the Pool Volume Calculator
- Open the Pool Volume Calculator and enter the values requested in the input fields.
- Check the units, percentages, dates, or time periods before reading the answer.
- Review the instant result and adjust any value to compare another scenario.
- Use the formula, example, and FAQs below to understand how the pool volume calculator works.
Frequently Asked Questions
How do you calculate pool volume in gallons?
Multiply length x width x average depth (in feet) by 7.48052 to convert cubic feet to gallons.
How do you find average depth for a pool with a deep end?
Add the shallow end depth and deep end depth together and divide by 2 to find the average depth to use in the volume formula, assuming a fairly linear slope between the two.
Why does pool volume matter for chemical treatment?
Chlorine, pH adjusters, and other pool chemicals are dosed based on total pool volume, so an accurate volume figure is necessary to avoid under- or over-treating the water.
How do I use this pool volume calculator?
Enter the known values, review the units or settings, and the calculator updates the result instantly. The formula and example on this page show how the answer is produced.
What does the Pool Volume Calculator calculate?
Calculate pool volume in cubic feet, gallons, and liters. It is designed for fast browser-based calculations without sign-up, downloads, or manual spreadsheet setup.
What formula does this pool volume use?
The formula is: gallons = length * width * average depth * 7.48052. The 7.48052 conversion constant comes from the precise, internationally defined relationship between the US gallon (231 cubic inches) and the cubic foot, formalized in US customary measurement standards - an accurate pool volume matters beyond curiosity, since chlorine and pH treatment chemical dosing instructions are calculated directly from total pool volume.
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Last updated: September 27, 2026.