Use the form below to calculate the size of the liner you need for your pond.
You need to measure the widest possible point in metres (i.e. 167cm would be entered as 1.67) and the longest possible length (again in metres). Enter these with the maximum depth (i.e. the deepest part of your proposed pond). The calculator will work out your minimum required size liner including adding 30cm each side for overlap.
This calculator will work for irregular shaped ponds such as the one shown. If you have an extremely complex shape (such as an "H" shape or something) then please contact a local expert as it gets quite complicated.