Ø 18 ft round pool
pool plan
A full family pool: a shallow end where kids stand and games happen, a proper deep end for diving-free swimming, and enough length that two people can swim without negotiating. This is the most-built size class in private gardens for a reason.
A round pool is the most social shape there is: everyone faces everyone, there's no deep-end hierarchy, and it drops into a small garden or courtyard without dominating it. It's the natural choice for cooling off, kids' play and spa-like plunge pools rather than lap swimming.
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Ø 18 ft — shown to scale
The numbers, computed
- Water surface
- 254 sq ft
- Water volume
- 8,576 gal (35.8 tons)
- Perimeter
- 56′ 6″
- Depth
- 3′ 11″–5′ 11″
- Excavation approx.
- 71 cu yd
- Fill time (garden tap)
- 22 hours
- Skimmers needed
- 1×
- Heat pump size
- 41,000 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.
What it costs to build
A rough installed-cost range per construction type, at this size — the pool itself, with basic coping. Not a quote.
| Construction | Installed cost | Note |
|---|---|---|
| Vinyl liner | $33,000–$49,000 | Fastest and least expensive; the liner is replaced every 8–12 years. |
| Fiberglass | $43,000–$62,000 | One-piece shell, quick install; limited to sizes and shapes a mould exists for. |
| Concrete (gunite) | $53,000–$82,000 | Built to any shape or size; the slowest build and the most upkeep. |
Rough 2026 estimates for the pool installed with basic coping — excavation, shell and basic equipment. Excludes deck, fencing, landscaping, heating and permits, all of which vary by site and by builder; get real bids before budgeting from these figures.
Questions about this plan
- How much water does the Ø 18 ft pool hold?
- About 8,576 gal (35.8 tons of water) at 3′ 11″–5′ 11″ depth — computed from the actual pool outline, not a rule of thumb.
- How long does it take to fill?
- Roughly 22 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 254 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.
- How much does the Ø 18 ft round pool cost to build?
- Roughly $33,000 to $82,000 installed at this size, depending on construction type — before deck, fence, landscaping, heating or permits. See the cost table above for the range per type.
Similar pool plans
Ø 15 ft · Round
Compact pool5,298 gal · 176 sq ft
12 × 24 ft · Rectangular
Family pool9,675 gal · 288 sq ft
12 × 24 ft · Rounded rectangle
Family pool9,344 gal · 282 sq ft
12 × 24 ft · Oval
Family pool7,648 gal · 225 sq ft
Ø 21 ft · Round
Family pool11,247 gal · 345 sq ft
14 × 28 ft · Rectangular
Family pool13,169 gal · 392 sq ft
Go on — put a pool in your garden.
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