What size liner for an 8×6 pond, 2 ft deep?
An 8 × 6 ft pond 2 ft deep needs a liner at least 14 feet by 12 feet (14 × 12 ft): the pond length or width, plus twice the 2 ft depth, plus 1 ft of overlap on each edge. As an oval pond averaging about 16 in deep, it holds roughly 375 gallons of water.
How to work it out
- Length: 8 ft + 2 × 2 ft deep + 2 × 1 ft overlap = 14 ft
- Width: 6 ft + 2 × 2 ft + 2 × 1 ft = 12 ft
- Water: 8 ft × 6 ft × 1.33 ft avg × shape factor × 7.48 gal/cu ft ≈ 375 gal
Eight by six feet is a common first pond: big enough for a few goldfish and water plants, small enough to dig by hand over a weekend or two. Two feet at the deepest point gives fish somewhere cooler in summer; where winters are hard, local pond clubs often suggest going deeper so part of the pond stays unfrozen.
Adjust for your project
More options: Spill
- Buy at least
- 14 × 12 ft
- Liner area (also the underlayment)
- 168 sq ft
- Water volume (approx.)
- 375 gal (1,420 L)
- Pump flow (rule of thumb)
- 188–375 gal/hr
- The pump range assumes moving the whole pond volume once every one to two hours, a common starting point for garden ponds. Fish-heavy and koi ponds are often run faster.
- Waterfalls need flow for their width: pond suppliers suggest roughly 1,500 gallons per hour per foot of spill (100–125 per inch) for an even sheet, about half for a trickle and double for a heavy fall. Pumps lose flow the higher they lift and through bends and filters, so check the maker’s chart at your waterfall’s height.
- Add a protective underlayment (or old carpet) the same size as the liner to guard against stones and roots.
Liner for an 8 × 6 ft pond, 2 ft deep, by edge overlap
| Overlap each side | Liner length | Liner width | Buy at least | Liner area (also the underlayment) |
|---|---|---|---|---|
| 0.5 ft | 13 ft | 11 ft | 13 × 11 ft | 143 sq ft |
| 1 ft | 14 ft | 12 ft | 14 × 12 ft | 168 sq ft |
| 1.5 ft | 15 ft | 13 ft | 15 × 13 ft | 195 sq ft |
| 2 ft | 16 ft | 14 ft | 16 × 14 ft | 224 sq ft |
What to know about an 8×6 pond, 2 ft deep
- Stock sizes. Many suppliers sell EPDM liner in 5 ft steps (10 × 15, 15 × 15, 15 × 20 ft and so on) or cut to length from a wide roll. A 14 × 12 ft requirement usually means buying 15 × 15 ft and trimming about 57 sq ft after the pond settles. Don’t buy 10 × 15 and hope it stretches; it won’t reach the edging.
- How much overlap. EasyPro’s sizing rule adds at least 1 ft to each dimension for overhang. This example allows 1 ft on every edge (2 ft per dimension), which leaves room to tuck the liner under stone edging and still trim neatly after filling.
- Underlayment. Lay a protective underlayment of the same 168 sq ft under the liner. Garden centre underlay and old synthetic carpet both work; stones and roots in freshly dug soil are the usual cause of leaks.
- The dig. The water volume is about 50 cubic feet, so expect to move roughly 1.9 cubic yards of soil (a cubic yard is 27 cubic feet), more once it is loose. Use it to build up the planting around the edge.
- Pump and top-ups. Turning the water over every one to two hours means a pump of roughly 188–375 gallons per hour. Evaporation needs replacing in summer; a barrel on a nearby shed is ideal — How much rainwater from a 10×12 shed roof catches about 66 gallons per inch of rain.
Different size? Use the full Pond Liner Calculator.
What you’ll need
- EPDM pond liner (fish-safe)Premium price
Flexible rubber liner that folds into curves and shelves. Check the size against the calculator before ordering — stock sizes step up in whole feet.
See options on Amazon (opens in a new tab) - Pond liner underlaymentMid-range price
A felt layer under the liner that protects it from stones and roots. Buy the same size as the liner.
See options on Amazon (opens in a new tab) - Square-point transfer shovelBudget price
Flat blade for scooping gravel, soil and sand off a driveway pile — a round shovel leaves too much behind.
See options on Amazon (opens in a new tab)
As an Amazon Associate we earn from qualifying purchases. Links to products are affiliate links — they cost you nothing extra and help keep these calculators free.
Frequently asked questions
What size liner for an 8×6 pond, 18 inches deep?
At least 13 feet by 11 feet (13 × 11 ft) with 1 ft of overlap per edge. Averaging 1 ft deep as an oval, it holds about 282 gallons.
What size liner for an 8×6 pond, 3 ft deep?
At least 16 feet by 14 feet (16 × 14 ft). Every extra foot of depth adds 2 ft to both liner dimensions.
How many gallons in a rectangular 8×6 pond averaging 16 inches deep?
About 478 gallons: 8 × 6 × 1.33 ft × 7.48 gallons per cubic foot. Straight sides hold more than an oval of the same length and width.
Sources
- EasyPro Pond Products — What do I need to know about pond liners (opens in a new tab) — Liner sizing: add the depth twice to the length and width, then add overhang; EPDM for water gardens; install over protective underlayment.
- Webb’s Water Gardens — Pond Pump Sizing Guide (opens in a new tab) — Waterfalls: about 1,500 gph per foot of width (≈125 gph per inch) as a common residential starting point.
- smartpond — Planning to Build a Waterfall (opens in a new tab) — 100 gph per inch of spillway for a sheet of water; half for a trickle, double for a heavy flow; bends and filters reduce flow.