About this calculator
The size of liner to buy for a dug pond, including the depth on both sides and the edge overlap.
How it’s calculated
Liner length = pond length + 2 × max depth + 2 × overlap. Liner width = width + 2 × depth + 2 × overlap.
Worked example
With these inputs:
- Pond length
- 3 m
- Pond width
- 2 m
- Maximum depth
- 0.6 m
- Edge overlap (each side)
- 300 mm
the result is:
- Liner size
- 4.8 m × 3.8 m
- Liner area
- 18.24 m²
Tips from the trade
- Shelves don’t change the liner size. Max depth already covers them.
- Always put a protective underlay beneath the liner.
Results are estimates for planning and pricing. Check quantities against your drawings, the manufacturer’s data and SANS 10400 (the National Building Regulations) and your local municipality before ordering.