How many gallons in a 15×30 oval pool?
A 15 × 30 ft oval above-ground pool with a 52 in wall, filled to 46 in, holds about 11,519 gallons.
How to work it out
- 3.1416 × (15 ft ÷ 2)² + (30 ft − 15 ft) × 15 ft = 402 sq ft
- Water depth: 52 in wall − 6 in = 46 in
- 401.7 sq ft × 3.833 ft × 7.48 = 11,519 gal
Above-ground ovals are not ellipses: they are a 15 ft rectangle with a 15 ft half-circle on each end. That shape holds noticeably more water than the “length × width × 5.9” oval formula some charts use.
Adjust for your project
- Gallons if filled to the top of the wall
- 13,022 gal
- Water depth
- 46 in
- Water surface
- 402 sq ft
- Water in each inch of level
- 250 gal
- Oval above-ground pools have straight sides and semicircular ends, so they hold more than an egg-shaped ellipse of the same length and width. Some gallon charts use the ellipse formula, which reads 10–15% lower.
Oval pools (52 in wall, 46 in water) by size
| Length (15 ft wide) | Gallons at your water level | Water surface |
|---|---|---|
| 24 ft | 8,939 gal | 312 sq ft |
| 27 ft | 10,229 gal | 357 sq ft |
| 30 ft | 11,519 gal | 402 sq ft |
| 33 ft | 12,810 gal | 447 sq ft |
Straight sides make the difference
The water surface is a 15 × 15 ft middle section plus two half-circles of 15 ft diameter: 225 + 177 = about 402 sq ft. At 46 in deep that is about 11,500 gallons. An ellipse 15 × 30 ft would have only 353 sq ft and about 10,100 gallons — some 1,400 gallons less, which is why oval charts disagree so much (about 10,135 gallons by the ellipse formula).
- Per inch: about 250 gallons.
- 48 in wall, filled to 42 in: about 10,520 gallons.
- Doses: treat it as roughly an 11,500 gallon pool — label rates times 1.15.
- Buttresses. Steel-wall ovals have side braces that take up a little room under the deck but don’t change the water inside the wall.
The bigger oval is on how many gallons in an 18x33 oval pool. A round pool of similar volume is the 21 ft round pool.
Different size? Use the full Above-Ground Pool Gallons Calculator.
What you’ll need
- Hose water flow meterBudget price
Screws onto the hose and counts gallons, so you know exactly how much went in — and your real fill rate.
See options on Amazon (opens in a new tab) - Pool test stripsBudget price
Quick daily checks. Fine for spotting a trend; use a drop kit when you’re about to add a big dose or shock.
See options on Amazon (opens in a new tab) - Solar cover (bubble cover)Mid-range price
The cheapest heating upgrade there is: cuts evaporation and holds heat in overnight. Buy the size up and trim it.
See options on Amazon (opens in a new tab)
As an Amazon Associate we earn from qualifying purchases. Links to products are affiliate links — they cost you nothing extra and help keep these calculators free.
Frequently asked questions
How many gallons in a 15×30 oval pool 48 inches deep?
About 12,020 gallons with 48 in of water.
How many gallons in a 12×24 oval pool?
About 7,372 gallons with a 52 in wall filled to 46 in.
How many gallons in a 16×32 oval above-ground pool?
About 13,106 gallons with a 52 in wall filled to 46 in.
Other common sizes
- How many gallons in a 24 ft round pool — 12,972 gal
- How many gallons in an 18x48 pool — 6,662 gal
- How many gallons in a 15x48 pool — 4,627 gal
- How many gallons in a 12x30 pool — 1,904 gal
- How many gallons in a 21 ft round pool — 9,932 gal
- How many gallons in a 27 ft round pool — 16,418 gal
- How many gallons in an 18x33 oval pool — 15,039 gal
Sources
- NIST Handbook 44, Appendix C — General tables of units of measurement (opens in a new tab) — 1 US gallon = 231 cubic inches (7.48052 gallons per cubic foot).
- Intex — Ultra XTR Frame 24 ft × 52 in pool (product page) (opens in a new tab) — Lists a water capacity of 12,481 gallons for a 24 ft × 52 in pool; the fill depth is not stated.
- Intex — Ultra XTR Frame 18 ft × 52 in pool (product page) (opens in a new tab) — Lists 6,981 gallons.
- Intex — Ultra XTR Frame 16 ft × 48 in pool (product page) (opens in a new tab) — Lists “5,061 gallons (90%)” — capacity at 90% of the wall height.