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Pond liner size chart

Liner sizes for common ponds and depths, worked out as length + 2 × depth + 2 × overlap and rounded up. Use the pond liner calculator for any other size.

Feet (1 ft overlap per edge)

Pond	1.5 ft deep	2 ft deep	3 ft deep	4 ft deep
6 × 4 ft	11 ft × 9 ft	12 ft × 10 ft	14 ft × 12 ft	16 ft × 14 ft
8 × 6 ft	13 ft × 11 ft	14 ft × 12 ft	16 ft × 14 ft	18 ft × 16 ft
10 × 8 ft	15 ft × 13 ft	16 ft × 14 ft	18 ft × 16 ft	20 ft × 18 ft
12 × 8 ft	17 ft × 13 ft	18 ft × 14 ft	20 ft × 16 ft	22 ft × 18 ft
15 × 10 ft	20 ft × 15 ft	21 ft × 16 ft	23 ft × 18 ft	25 ft × 20 ft
20 × 15 ft	25 ft × 20 ft	26 ft × 21 ft	28 ft × 23 ft	30 ft × 25 ft

Metres (30 cm overlap per edge)

Pond	50 cm	60 cm	80 cm	100 cm	120 cm
2 × 1.5 m	4.00 m × 3.50 m	4.00 m × 3.50 m	4.50 m × 4.00 m	5.00 m × 4.50 m	5.00 m × 4.50 m
3 × 2 m	5.00 m × 4.00 m	5.00 m × 4.00 m	5.50 m × 4.50 m	6.00 m × 5.00 m	6.00 m × 5.00 m
4 × 3 m	6.00 m × 5.00 m	6.00 m × 5.00 m	6.50 m × 5.50 m	7.00 m × 6.00 m	7.00 m × 6.00 m

Marginal shelves don’t change the liner size; use the deepest point. On sandy soil or under heavy edging, add another 6–12 in (15–30 cm) of overlap. Buy underlay the same size. The liner sizing guide explains why.