Rex says
Everyday utility math — the kind you'd otherwise pull up four browser tabs for. I keep it to one clean answer.
Try a scenario
Click to load — tweak from there.Inputs
Result
Pool volume (gallons)
22,021
Litres
83,350
Surface area (sq ft)
512
Average depth (ft)
5.75
Hours to fill
40.8
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One click, a permanent link with your numbers baked in.
How to use this
- 1Enter pool shape.
- 2Enter length or diameter (ft).
- 3Enter width (ft).
- 4Enter shallow end depth (ft).
- 5Enter deep end depth (ft).
- 6Enter fill rate (gal/min).
- 7Read your pool volume (gallons) on the right — it updates as you type.
- 8Hit Share to keep the scenario or send it to someone.
About this calculator
Chemical dosing depends entirely on getting the gallon count right. For a sloped bottom, use the average of the shallow and deep end depths.
Worked example
Using the values the calculator loads with:
Inputs
- Pool shape: Rectangular
- Length or diameter: 32 ft
- Width: 16 ft
- Shallow end depth: 3.5 ft
- Deep end depth: 8 ft
- Fill rate: 9 gal/min
Results
- Pool volume (gallons): 22,021.12
- Litres: 83,349.94
- Surface area (sq ft): 512
- Average depth (ft): 5.75
- Hours to fill: 40.8
What each field means
Inputs
- Pool shape
- Pick the option that matches your situation — the maths changes per option. Choices: Rectangular, Round, Oval.
- Length or diameter (ft)
- The length or diameter used in the calculation, measured in ft. Starts at 32 ft so you have a working example on load.
- Width (ft)
- The width used in the calculation, measured in ft. Starts at 16 ft so you have a working example on load.
- Shallow end depth (ft)
- The shallow end depth used in the calculation, measured in ft. Starts at 3.5 ft so you have a working example on load.
- Deep end depth (ft)
- The deep end depth used in the calculation, measured in ft. Starts at 8 ft so you have a working example on load.
- Fill rate (gal/min)
- The fill rate used in the calculation, measured in gal/min. Starts at 9 gal/min so you have a working example on load.
Results
- Pool volume (gallons)
- Returned as a whole number and shown as the headline result. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Litres
- Returned as a whole number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Surface area (sq ft)
- Returned as a whole number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Average depth (ft)
- Returned as a decimal number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Hours to fill
- Returned as a decimal number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
FAQ
How does the pool volume calculator work?
Chemical dosing depends entirely on getting the gallon count right. For a sloped bottom, use the average of the shallow and deep end depths. The underlying maths is: Gallons = Length × Width × Average depth × 7.48 (rectangular).
What do I need to enter?
6 values: pool shape, length or diameter, width, shallow end depth, deep end depth, and fill rate. Each field starts with a sensible default, so you can change one number at a time and watch the result move.
What does the pool volume (gallons) result mean?
It is returned as a whole number and updates live as you edit the inputs, so you can compare two or three versions of a scenario in a few seconds.
Is this calculator free, and do I need an account?
Yes, it's free, and no account is required. Nothing you type is stored on our servers — the maths runs entirely in your browser.
How accurate is the result?
It applies the standard formula exactly, so the arithmetic is precise. Estimates assume standard, average conditions — local rules, pricing, and materials vary.
Who is this tool for?
It's built for anyone doing everyday planning maths — a quick estimate that would otherwise need four browser tabs and a calculator app.
Accuracy and limitations
- Estimates assume standard, average conditions — local rules, pricing, and materials vary.
- Results are rounded for readability; add a buffer before ordering, booking, or committing.
- Double-check anything with a real cost attached against a local quote.
Related tools
Cite this calculator
Writing about this topic? Grab a citation — every link helps keep these tools free.
RevenueLab. (2026). Pool Volume Calculator. Retrieved from https://www.revenuelab.fyi/toolbox/pool-volume
<p>Source: <a href="https://www.revenuelab.fyi/toolbox/pool-volume" target="_blank" rel="noopener">Pool Volume Calculator — RevenueLab</a> (2026).</p>
Source: [Pool Volume Calculator — RevenueLab](https://www.revenuelab.fyi/toolbox/pool-volume) (2026).