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20 × 15 ft pond: gallons, liner and pump
A 20 × 15 ft pond with straight sides, 4.0 ft deep, holds 8,977 US gallons (33,980 litres). Adjust the shape and depth below for your pond.
Volume by depth
| Depth | US gallons | Litres | UK gallons | Oval, same size |
|---|---|---|---|---|
| 3 ft | 6,732 | 25,485 | 5,606 | 5,288 (20,016 L) |
| 4 ft | 8,977 | 33,980 | 7,475 | 7,050 (26,688 L) |
| 5 ft | 11,221 | 42,475 | 9,343 | 8,813 (33,360 L) |
What a 20 × 15 ft pond needs at 4.0 ft
| Liner | 30 ft × 25 ft (with 1 ft overlap) |
|---|---|
| Pump — goldfish | 8,977 GPH (33,980 L/h) |
| Pump — koi | 13,465–17,953 GPH (50,970–67,960 L/h) |
| UV clarifier | 2 × 75 W goldfish · 2 × 110 W koi |
| Fish | 74–149 adult goldfish · up to 35 koi |
| Water weight | 74,910 lb (33,980 kg) |
See the guides to liner sizing and pump sizing, and koi pond depth and volume.
Questions
How many gallons is a 20 × 15 ft pond?
At 4.0 ft deep with straight sides, 8,977 US gallons (33,980 litres, 7,475 UK gallons). An oval pond of the same length and width holds about 79% of that.
What size liner does a 20 × 15 ft pond need?
30 ft × 25 ft for 4.0 ft deep with 1 ft of overlap on each edge.
What size pump for a 20 × 15 ft pond?
About 8,977 GPH (33,980 L/h) of real flow for goldfish, or 13,465–17,953 GPH for koi.