Estimate water volume for curved kidney-shaped pools using standard shape factor calculations.
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 a shape factor of 6.7 to approximate the curved kidney footprint.
Uses a 6.7 planning factor to approximate the inward curve of kidney footprints. 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 kidney-shaped pool volume calculator is a planning-grade approximation that uses a shape factor of 6.7 instead of the standard 7.48 cubic-foot-to-gallon factor. The formula — length × width × average depth × 6.7 — accounts for the curved indentation that gives kidney pools their distinctive silhouette.
Measure the longest overall length and the widest overall width of the pool at the water surface. Use actual water depth, not wall height. The shape factor is calibrated for a typical kidney curve; pools with a very shallow or very deep indentation may diverge from the 6.7 approximation. For manual estimation methods and irregular shapes, see how to calculate pool volume manually.
Because kidney pools vary widely in curvature and proportions, the result is best treated as a good planning estimate rather than an exact volume. If your pool has a particularly unusual kidney profile, consider dividing it into two roughly circular or oval sections, calculating each separately, and summing the results.
The kidney-shaped calculator uses a shape factor of 6.7 — lower than the standard 7.48 — to approximate the curved kidney footprint. Output conversions are verified across all five units using NIST-referenced factors, just as with the geometric-model shapes.
Deterministic QA confirms that the code produces the expected result for representative kidney-pool dimensions at the 6.7 factor. Verification means the implemented approximation is mathematically consistent — it does not claim that 6.7 perfectly models every possible kidney curve.
Estimate water volume for curved kidney-shaped pools using standard shape factor calculations.
Uses a shape factor of 6.7 to approximate the curved kidney footprint.
Uses a 6.7 planning factor to approximate the inward curve of kidney footprints. 1 US gallon equals 3.785 litres.
30 × 15 ft
45,652 L • 1,612 ft³
Swipe horizontally to view all columns
| Pool Size | Average Depth | US Gallons | Litres | Cubic Feet (ft³) |
|---|---|---|---|---|
| 30 × 15 ft | 4 ft | 12,060 | 45,652 | 1,612 |
| 32 × 16 ft | 4.5 ft | 15,437 | 58,435 | 2,064 |
| 36 × 18 ft | 4.5 ft | 19,537 | 73,956 | 2,612 |
| 40 × 20 ft | 5 ft | 26,800 | 101,449 | 3,583 |
Uses a shape factor of 6.7 to approximate the curved kidney footprint.
Swipe horizontally to view all columns
| Pool Size | Average Depth | Litres | US Gallons | m³ |
|---|---|---|---|---|
| 8 × 4 m | 1.4 m | 40,126 | 10,600 | 40.13 |
| 10 × 5 m | 1.5 m | 67,174 | 17,746 | 67.17 |
| 12 × 6 m | 1.6 m | 103,180 | 27,257 | 103.18 |
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 Kidney Pool at 4 ft average depth holds approximately 12,060 US gallons (45,652 litres).
The standard Kidney Pool formula is Volume (US gallons) = Pool Length x Pool Width x Average Depth x 6.7. Use actual water depth for flat floors and average depth for sloped floors before converting the result.
Measure the longest length, the widest width, the narrowest width through the waist, and the average water depth. Kidney pool volume is still an estimate because the curves vary by design.
Multiply US gallons by 3.785 to convert to litres. A 30 × 15 ft Kidney Pool with about 12,060 gallons is roughly 45,652 litres.
