Calculate oval pool water capacity using long diameter, short diameter, and average depth.
Actual water capacity may vary due to steps, benches, slopes, rounded corners, and the normal waterline.
Water weight only, not total structural load.
Use this as a circulation estimate. Pump sizing also depends on plumbing, filters, and total dynamic head.
Quick estimates use the calculated pool volume and common planning formulas. Follow the product label, circulate, and re-test before adding more.
Uses the ellipse area formula with long and short diameters as measured inputs.
Measure the full diameters, not radii, before entering values. This model assumes an elliptical basin. 1 US gallon equals 3.785 litres.
Use actual water depth or a representative average depth, not the full wall or shell height.
Curved or irregular shapes remain planning estimates unless the geometry is measured in more detail.
Steps, benches, or tanning ledges that materially change pool volume should be accounted for separately.
The oval pool volume calculator uses the ellipse formula — π × (long diameter ÷ 2) × (short diameter ÷ 2) × depth — to compute geometric volume. The result is then converted across all five output units automatically. For step-by-step math and worked examples, refer to manual pool-volume formulas.
Measure both the long diameter (the longest distance across) and the short diameter (the shortest distance across), each through the center of the basin. Use interior water-holding dimensions, not the outer rail or frame. Record actual water depth to the pool floor, not the total wall height. See our guide to pool volume units and conversions for practical conversions across liquid units.
The ellipse model assumes a smooth, symmetrical oval footprint. Pools with pronounced straight sides in the middle (a "stadium" or "oblong" shape) or noticeable asymmetry may produce slightly different real volumes. Steps, benches, and contour features reduce the actual water-holding capacity below the geometric calculation.
The oval pool formula — π × (long diameter ÷ 2) × (short diameter ÷ 2) × depth — uses the standard elliptical prism model. All five output unit conversions are verified against NIST-referenced factors to ensure cross-unit consistency.
QA checks confirm that the code produces the expected result for known oval-pool dimensions. Verification covers formula-to-model accuracy and unit conversion consistency, not a promise that every real-world oval pool matches a perfect mathematical ellipse.
Calculate oval pool water capacity using long diameter, short diameter, and average depth.
Uses the ellipse area formula with long and short diameters as measured inputs.
Measure the full diameters, not radii, before entering values. This model assumes an elliptical basin. 1 US gallon equals 3.785 litres.
30 × 15 ft
40,032 L • 1,414 ft³
Swipe horizontally to view all columns
| Pool Size | Average Depth | US Gallons | Litres | Cubic Feet (ft³) |
|---|---|---|---|---|
| 30 × 15 ft | 4 ft | 10,575 | 40,032 | 1,414 |
| 32 × 16 ft | 4.5 ft | 13,536 | 51,241 | 1,810 |
| 36 × 18 ft | 4.5 ft | 17,132 | 64,852 | 2,290 |
| 40 × 20 ft | 5 ft | 23,501 | 88,960 | 3,142 |
Uses the ellipse area formula with long and short diameters as measured inputs.
Swipe horizontally to view all columns
| Pool Size | Average Depth | Litres | US Gallons | m³ |
|---|---|---|---|---|
| 8 × 4 m | 1.4 m | 35,186 | 9,295 | 35.19 |
| 10 × 5 m | 1.5 m | 58,905 | 15,561 | 58.90 |
| 12 × 6 m | 1.5 m | 84,823 | 22,408 | 84.82 |
Use the main pool volume result with specialized calculators for water care, pumps, heaters, decks, covers, and pool capacity planning.
Choose the shape that best matches the pool.
Use these for specific layouts and planning cases.
Turn volume and surface area into practical next steps.
Use your calculated pool volume for dosing estimates.
Common questions about calculating pool water volume.
A 30 × 15 ft Oval Pool at 4 ft average depth holds approximately 10,575 US gallons (40,032 litres).
The standard Oval Pool formula is Volume (US gallons) = π x (Long Diameter / 2) x (Short Diameter / 2) x Average Depth x 7.48. Use actual water depth for flat floors and average depth for sloped floors before converting the result.
Measure the longest inside length, the widest inside width, and the water depth. Use the full long and short diameters, not the radii.
Multiply US gallons by 3.785 to convert to litres. A 30 × 15 ft Oval Pool with about 10,575 gallons is roughly 40,032 litres.
