Home / Pond sizes / 12 × 8 ft
12 × 8 ft pond: gallons, liner and pump
A 12 × 8 ft pond with straight sides, 3.0 ft deep, holds 2,154 US gallons (8,155 litres). Adjust the shape and depth below for your pond.
Volume by depth
| Depth | US gallons | Litres | UK gallons | Oval, same size |
|---|---|---|---|---|
| 2 ft | 1,436 | 5,437 | 1,196 | 1,128 (4,270 L) |
| 3 ft | 2,154 | 8,155 | 1,794 | 1,692 (6,405 L) |
| 4 ft | 2,873 | 10,874 | 2,392 | 2,256 (8,540 L) |
What a 12 × 8 ft pond needs at 3.0 ft
| Liner | 20 ft × 16 ft (with 1 ft overlap) |
|---|---|
| Pump — goldfish | 2,154 GPH (8,155 L/h) |
| Pump — koi | 3,232–4,309 GPH (12,233–16,311 L/h) |
| UV clarifier | 36 W goldfish · 55 W koi |
| Fish | 17–35 adult goldfish · up to 8 koi |
| Water weight | 17,980 lb (8,160 kg) |
See the guides to liner sizing and pump sizing, and koi pond depth and volume.
Questions
How many gallons is a 12 × 8 ft pond?
At 3.0 ft deep with straight sides, 2,154 US gallons (8,155 litres, 1,794 UK gallons). An oval pond of the same length and width holds about 79% of that.
What size liner does a 12 × 8 ft pond need?
20 ft × 16 ft for 3.0 ft deep with 1 ft of overlap on each edge.
What size pump for a 12 × 8 ft pond?
About 2,154 GPH (8,155 L/h) of real flow for goldfish, or 3,232–4,309 GPH for koi.