Calculate total volume for L-shaped pools by splitting the footprint into two rectangular sections.
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.
Break into two rectangles, calculate each volume separately, and add them together.
Calculate as the sum of two non-overlapping rectangular sections with independent dimension inputs. 1 cubic foot equals 7.48 US gallons or 28.32 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 L-shaped pool volume calculator divides the pool into two rectangular sections, calculates each section's volume independently, and sums the results. Each section uses the standard rectangular prism formula — length × width × depth × 7.48. To review section-by-section formulas and worked examples, see manual pool-volume formulas.
Enter the dimensions for both Section A and Section B carefully, making sure the sections do not overlap. If the two legs share a common area, that zone should be included in only one section to avoid double-counting volume. Use interior water-holding dimensions and actual water depth for each section.
The two-rectangle model works well for pools with a clean right-angle intersection. Pools with rounded inside corners, curved transitions, or sections of unequal depth may produce results that differ from the real water-holding capacity. Steps and benches in either section displace water the flat-floor model does not subtract.
The L-shaped calculator sums two rectangular prism sections, each using length × width × depth × 7.48052. Both section volumes and their combined total are verified for unit conversion accuracy across US gallons, UK gallons, litres, cubic metres, and cubic feet.
QA checks cover representative two-section inputs and confirm that the code correctly sums volumes without double-counting. Verification ensures consistent math across both sections and all output units — it does not remove the user's responsibility to enter non-overlapping section dimensions.
Calculate total volume for L-shaped pools by splitting the footprint into two rectangular sections.
Break into two rectangles, calculate each volume separately, and add them together.
Calculate as the sum of two non-overlapping rectangular sections with independent dimension inputs. 1 cubic foot equals 7.48 US gallons or 28.32 litres.
24 × 12 + 12 × 12 ft
48,932 L • 1,728 ft³
Swipe horizontally to view all columns
| Pool Size | Average Depth | US Gallons | Litres | Cubic Feet (ft³) |
|---|---|---|---|---|
| 24 × 12 + 12 × 12 ft | 4 ft | 12,926 | 48,932 | 1,728 |
| 32 × 14 + 14 × 14 ft | 4.5 ft | 21,679 | 82,062 | 2,898 |
| 36 × 16 + 16 × 16 ft | 5 ft | 31,119 | 117,798 | 4,160 |
| 40 × 18 + 18 × 18 ft | 5 ft | 39,048 | 147,814 | 5,220 |
Break into two rectangles, calculate each volume separately, and add them together.
Swipe horizontally to view all columns
| Pool Size | Average Depth | Litres | US Gallons | m³ |
|---|---|---|---|---|
| 7 × 4 + 3 × 4 m | 1.4 m | 56,000 | 14,794 | 56.00 |
| 9 × 4.5 + 4 × 4.5 m | 1.5 m | 87,750 | 23,181 | 87.75 |
| 12 × 5 + 5 × 5 m | 1.6 m | 136,000 | 35,927 | 136.00 |
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 24 × 12 + 12 × 12 ft L-Shaped Pool at 4 ft average depth holds approximately 12,926 US gallons (48,932 litres).
The standard L-Shaped Pool formula is Volume (US gallons) = (A Length x A Width x Depth x 7.48) + (B Length x B Width x Depth x 7.48). Use actual water depth for flat floors and average depth for sloped floors before converting the result.
Split the pool into two rectangles, measure each section separately, calculate both section volumes, and add them together. Do not use the outer bounding rectangle by itself.
Multiply US gallons by 3.785 to convert to litres. A 24 × 12 + 12 × 12 ft L-Shaped Pool with about 12,926 gallons is roughly 48,932 litres.
