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
Total water volume
10,575
Total cubic feet
1,414
Psst — share this and help Rex grow
One click, a permanent link with your numbers baked in.
How to use this
- 1Enter pool length (ft).
- 2Enter pool width (ft).
- 3Enter average depth (ft).
- 4Read your total water volume on the right — it updates as you type.
- 5Hit Share to keep the scenario or send it to someone.
About this calculator
15x30 oval is a common above-ground pool footprint that fits more swimmers than a round pool in a similar yard space. This calculator uses the ellipse area formula with a default 4-foot depth to return total gallons for chemical dosing and pump sizing.
Worked example
Using the values the calculator loads with:
Inputs
- Pool length: 30 ft
- Pool width: 15 ft
- Average depth: 4 ft
Results
- Total water volume: 10,575
- Total cubic feet: 1,414
What each field means
Inputs
- Pool length (ft)
- The pool length used in the calculation, measured in ft. Starts at 30 ft so you have a working example on load.
- Pool width (ft)
- The pool width used in the calculation, measured in ft. Starts at 15 ft so you have a working example on load.
- Average depth (ft)
- The average depth used in the calculation, measured in ft. Starts at 4 ft so you have a working example on load. Accepted range: 2–10 ft.
Results
- Total water volume
- 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.
- Total cubic feet
- Returned as a whole number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
FAQ
How many gallons is a 15x30 oval pool?
At a 4-foot average depth, about 10,573 gallons, notably more than a comparable round pool due to the larger surface area.
Is the oval area formula the same as a circle?
No, an oval (ellipse) uses half of each dimension as the two radii, so the formula multiplies both half-length and half-width by pi rather than squaring one radius.
Do oval pools need a bigger pump than round pools?
Generally yes, since they hold more water — size the pump and filter to turn over the full gallon volume within about 8 hours for adequate circulation.
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). 15x30 Oval Pool Gallons Calculator. Retrieved from https://www.revenuelab.fyi/toolbox/15x30-oval-pool-gallons-calculator
<p>Source: <a href="https://www.revenuelab.fyi/toolbox/15x30-oval-pool-gallons-calculator" target="_blank" rel="noopener">15x30 Oval Pool Gallons Calculator — RevenueLab</a> (2026).</p>
Source: [15x30 Oval Pool Gallons Calculator — RevenueLab](https://www.revenuelab.fyi/toolbox/15x30-oval-pool-gallons-calculator) (2026).