Choosing the right size liner is critical because you cannot easily 'add on' to a liner. This calculator accounts for the vertical walls and the necessary overlap to ensure full coverage. The depth of your pond significantly impacts the liner size needed.
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Pro Tips
Material: EPDM rubber is the gold standard (lasts 30+ years). PVC is cheaper but becomes brittle in sunlight (lasts ~10 years).
Underlayment: ALWAYS use an underlayment (geotextile or old carpet) to protect the liner from sharp rocks and roots from below.
Sunlight: Installing EPDM on a sunny day makes it flexible and easier to fold. Keep PVC out of direct sun to prolong life.
Shape: For irregular shapes, calculate for the widest and longest points. You will have excess material to fold or trim.
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Fun Facts
"A properly installed EPDM liner can last over 40 years if protected from UV rays."
"One cubic foot of water weighs 62.4 lbs. A small 1000-gallon pond holds over 8,000 lbs of water!"
"The 'overlap' isn't just for insurance; it's needed to anchor the liner under heavy rocks or soil so it doesn't slide into the pond."
