How to calculate your pond liner size

Measure the length, width, and depth of your pond.  If you have an irregular shape, say like a "figure 8" shape, you must include the widest part of the "8" as your width and the longest length for your measurements.  The depth measurement should be the deepest part of your pond.  Next, put your measurements into the following formula to calculate the pond liner size you need:

Length  + twice the maximum depth + 2 x 300 mm* = length of pond liner needed
Width  + twice the maximum depth + 2 x 300 mm* = width of pond liner needed

For example, if your pond measurements are 3.5 m x 2.0 m and the pond depth is 1.1 m, here is how the formula works:

Length.... 3.5 metres +  2.2 metres (twice the depth) + 0.6 metres* =  6.3 metres in length 
Width .... 2.0 metres +  2.2 metres (twice the depth) + 0.6 metres* =  4.8 metres in width 
*or whatever you with to allow for the out of pond overlap

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