12 × 40 ft Rectangular
pool plan
A lap-class pool: long, narrow and uniformly deep, built for exercise. The constant depth makes flip turns predictable and halves the excavation surprises; the narrow width keeps volume — and therefore heating — in check for the length you get.
The rectangle is the default for a reason: it gives you the most swimmable water for a given footprint, plays well with modern architecture and lap swimming, and makes covers, solar blankets and automatic cleaners simple. Straight walls also keep formwork and tiling straightforward, which builders appreciate.
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12 × 40 ft — shown to scale
The numbers, computed
- Water surface
- 480 sq ft
- Water volume
- 15,903 gal (66.4 tons)
- Perimeter
- 104′
- Depth
- 4′ 5″–4′ 5″
- Excavation approx.
- 124 cu yd
- Fill time (garden tap)
- 40 hours
- Skimmers needed
- 2×
- Heat pump size
- 75,000 BTU/h
Figures are computed from the sampled pool outline and the plan's depths — the same geometry the 3D designer uses. Excavation includes shell and working allowance; your site conditions may differ.
Questions about this plan
- How much water does a 12 × 40 ft pool hold?
- About 15,903 gal (66.4 tons of water) at 4′ 5″–4′ 5″ depth — computed from the actual pool outline, not a rule of thumb.
- How long does it take to fill?
- Roughly 40 hours from a standard garden tap (~6.6 GPM). A water delivery service fills it in a few hours.
- Is this size right for my garden?
- The water surface is 480 sq ft; plan roughly 1.5–2× that footprint including the surrounding deck. Open the plan in the designer and set your own deck margins to see the full footprint.
- Can I change the depth or edge type?
- Yes — open the plan in the designer and adjust depths, edge system (skimmer, deck-level overflow or raised), finishes and accessories freely.
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Go on — put a pool in your garden.
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