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L-Shaped Pool Volume Calculator

An L-shaped or lazy L pool is two rectangles joined at a right angle. Measure each section on its own, and the calculator adds the areas before applying your depth.

L-Shaped / Lazy L pool with the measurements needed for a volume calculation

Calculate your l-shaped / lazy l pool volume

1. Pick your pool shape

Two rectangular sections joined at a right angle.

2. Enter your measurements

Measure in feet or meters. You always get gallons and litres back.

3. Set your depth

Average depth = (shallow + deep) / 2.

Your pool volume result

Pool volume

23,451 gallons

88,773 litres

Cubic feet
3,135 cu ft
Cubic metres
88.8 m3
Surface area
570 sq ft
Average depth
5.50 ft
Pool shape
L-Shaped / Lazy L
How we calculated this

Shape: L-Shaped / Lazy L. Dimensions used: Section 1 length 30 ft, Section 1 width 15 ft, Section 2 length 12 ft, Section 2 width 10 ft. Depth: 3 ft shallow and 8 ft deep, averaged to 5.50 ft. Formula: Volume = (L1 x W1 + L2 x W2) x average depth. Conversion: cubic feet x 7.48 = US gallons, gallons x 3.785 = litres, cubic feet x 0.0283 = cubic metres.

How the l-shaped pool volume calculator works

Multiply length by width for section one, do the same for section two, then add the two areas together. Multiply the total by average depth for cubic feet.

Split the pool where the corner turns so no area is counted twice. The main leg usually holds the deep end.

The formula

Volume = (L1 x W1 + L2 x W2) x average depth

Measure: Length and width of both sections, average depth.

Worked example

A 30 by 15 foot main section is 450 square feet. A 12 by 10 foot leg adds 120 square feet, giving 570 square feet.

At an average depth of 5 feet that is 2,850 cubic feet, about 21,320 gallons or 80,700 litres.

Tips before you measure

Draw the pool from above and mark the split line before you measure. It stops the overlap error that inflates most L-shape estimates.

If the shallow leg is a flat wading section, calculate it separately at its own depth for a tighter number.

L-Shaped / Lazy L pool volume FAQs

How do I split an L-shaped pool?

Extend one wall of the main rectangle across the corner. Everything past that line is section two.

Is a lazy L the same shape?

Close enough. A lazy L has an angled join instead of a square corner, so expect the estimate to run a few percent high.

Which section holds the deep end?

Usually the longer leg. Use the shallow and deep readings from that leg for the average depth.

Other pool shapes

Not quite the right outline? The main pool volume calculator covers all 20 shapes with the same units and formulas.