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Volume & Capacity · A6

L-Shaped Pool Volume Calculator

Two rectangles, one total. Get the combined volume of an L-shaped pool in gallons, liters & cubic feet.

Measure the inputsDivide the L at the inside corner so the two rectangles meet but never overlap — overlapping double-counts water.
Read the full resultEach arm of the L can have its own depth; many L-pools have a shallow play area and a deeper swim arm.
Check the boundaryMeasure interior waterline dimensions for both sections, not the deck or coping.

Useful forVolume & CapacityPlanningComparisonVerification

Live calculation

Pool sections

✓ Checked May 2026

Measure the L as two rectangles — enter each section separately.

Change a value. See the result.

Required fields are marked *. Engine validation and warnings remain active.

Enter the known values. Let the engine handle the calculation.

✓ Formula checked↻ Live result○ No account needed

Planning estimate only. Confirm product labels, equipment specifications, qualified-professional advice and local requirements before acting.

The result, explained

Use the L-Shaped Pool Volume Calculator result with context.

Two rectangles, one total. Get the combined volume of an L-shaped pool in gallons, liters & cubic feet.

01

The purpose

What does this calculator estimate?

Two rectangles, one total. Get the combined volume of an L-shaped pool in gallons, liters & cubic feet.

02

The tool

What information does it use?

  • Section 1 — length: The main (longer) arm of the L.
  • Section 1 — width: enter a measured or verified value
  • Section 1 — shallow depth: enter a measured or verified value
  • Section 1 — deep depth: enter a measured or verified value
  • Section 2 — length: The shorter arm of the L (don't double-count the overlap).
  • Section 2 — width: enter a measured or verified value
  • Section 2 — shallow depth: enter a measured or verified value
  • Section 2 — deep depth: enter a measured or verified value
  • Hose / fill rate: Garden hose: 5–17 GPM depending on pressure & diameter.
  • Local water rate: Average US municipal water: $0.004–0.008 / gallon.
03

The method

How to use this calculator

  1. Section 1 — lengthThe main (longer) arm of the L.
  2. Section 1 — widthEnter the value you can verify.
  3. Section 1 — shallow depthEnter the value you can verify.
  4. Section 1 — deep depthEnter the value you can verify.
  5. Section 2 — lengthThe shorter arm of the L (don't double-count the overlap).
  6. Section 2 — widthEnter the value you can verify.
  7. Section 2 — shallow depthEnter the value you can verify.
  8. Section 2 — deep depthEnter the value you can verify.
  9. Hose / fill rateGarden hose: 5–17 GPM depending on pressure & diameter.
  10. Local water rateAverage US municipal water: $0.004–0.008 / gallon.
04

The relationship

The formula in plain English

Volume = (Section 1 volume) + (Section 2 volume), each = L × W × Avg. Depth × 7.48

Split the L into two rectangles at the inside corner — measure each separately, don't overlap them
05

Worked through

A worked example: main arm 32 × 16 ft (3/8 ft depths), second arm 16 × 12 ft (3/5 ft depths)

  1. Section 1 avg depth = (3 + 8) ÷ 2 = 5.5 ft → 32 × 16 × 5.5 = 2,816 ft³
  2. Section 2 avg depth = (3 + 5) ÷ 2 = 4 ft → 16 × 12 × 4 = 768 ft³
  3. Total = (2,816 + 768) × 7.48 = 26,810 gallons
Total volume for common L configurations. Main arm at 5.5 ft avg depth, second arm at 4 ft avg depth.
Main armSecond armTotal surfaceVolume (US gal)Water weightFill time @ 9 GPM
24 × 12 ft12 × 10 ft408 ft²17,02271.0 tons~32 hrs
28 × 14 ft14 × 10 ft532 ft²22,27292.9 tons~41 hrs
32 × 16 ft16 × 12 ft704 ft²26,810111.8 tons~50 hrs
36 × 18 ft18 × 12 ft864 ft²33,123138.1 tons~61 hrs
40 × 20 ft20 × 14 ft1,080 ft²41,332172.4 tons~77 hrs
06

Why it matters

How the result supports the next decision

Divide the L at the inside corner so the two rectangles meet but never overlap — overlapping double-counts water.

Each arm of the L can have its own depth; many L-pools have a shallow play area and a deeper swim arm.

07

Good inputs

Improve the estimate before relying on it

  • Divide the L at the inside corner so the two rectangles meet but never overlap — overlapping double-counts water.
  • Each arm of the L can have its own depth; many L-pools have a shallow play area and a deeper swim arm.
  • Measure interior waterline dimensions for both sections, not the deck or coping.
  • The longer arm is usually the lap or swim section; the shorter arm is often the shallow lounge or steps area.
  • Add the two volumes only after computing each — averaging the depths across both arms gives a wrong total.
08

The boundary

How to interpret the result

Measurements, equipment specifications, site conditions and local requirements can change the practical result.

The engine reports invalid inputs and safety warnings beside the result. Resolve those messages before using the estimate.

09

Before acting

What should override this estimate?

  • Measured site conditions and current test results
  • Product labels and manufacturer specifications
  • Qualified-professional advice and applicable local codes
10

Common questions

Frequently asked questions

How do I split an L-shaped pool into two rectangles?

Draw a line at the inside corner of the L, extending it so the pool divides into two clean rectangles that touch but don't overlap. Measure the length, width, and depths of each rectangle separately. The calculator finds each volume and adds them.

Why can't I just use length times width for an L-shaped pool?

An L-shape isn't a single rectangle, so one length-times-width calculation would either miss the second arm or count the corner twice. Splitting it into two rectangles and summing them is the only way to get an accurate total.

Can the two arms of my L-pool have different depths?

Yes, and they often do. Many L-shaped pools pair a shallow lounging arm with a deeper swimming arm. Enter each section's own shallow and deep depths — the calculator averages them within each section before adding the volumes.

How do I avoid double-counting the corner?

When you draw your dividing line at the inside corner, make sure one rectangle ends exactly where the other begins. If both rectangles include the corner square, you'll overstate the volume. The two sections should tile the pool with no overlap and no gap.

How many gallons is a typical L-shaped pool?

A common L-pool with a 32 × 16 ft main arm and a 16 × 12 ft second arm, at moderate depths, holds roughly 26,000–27,000 US gallons. Exact volume depends on the depth of each arm.

How do you calculate the volume of an L-shaped pool?

Split the pool into two rectangles at the inside corner, calculate each rectangle's volume as length times width times average depth times 7.48, then add the two volumes together.

How many gallons is a 32×16 L-shaped pool with a 16×12 arm?

With a 5.5 ft average depth on the main arm and 4 ft on the second arm, this L-pool holds approximately 26,810 US gallons total.

Should each section of an L-pool be measured separately?

Yes. Each rectangle can have different dimensions and depths, so measure and calculate them independently, then sum the results for the true total volume.

Primary sources

Use the result with current guidance.

These official references support safe planning context. Product labels, local requirements and qualified-professional advice take priority over a general calculator estimate.