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Pond Volume Calculator

Estimate geometric water capacity and a simple liner sheet size. Use average depth for water volume, maximum depth for liner sizing, and enter the overlap you want at each edge.

Volume assumes a flat-bottom prism at the average depth entered. Liner dimensions apply the maximum depth to all sides and add your overlap around every edge. Sloped sides, shelves, curves, stones, folds, anchoring and supplier installation rules can change the actual volume and liner size. This is a geometric estimate, not a construction or water-treatment plan.

How do I calculate pond volume and liner size?

Choose the pond footprint, enter its plan dimensions and average water depth, then set the fill percentage. For the liner estimate, enter the maximum depth and the edge overlap to add around the perimeter. The tool reports liters, US and imperial gallons, and a rectangular sheet size.

Frequently asked questions

How do I calculate pond volume and liner size?

Choose the pond footprint, enter its plan dimensions and average water depth, then set the fill percentage. For the liner estimate, enter the maximum depth and the edge overlap to add around the perimeter. The tool reports liters, US and imperial gallons, and a rectangular sheet size.

Are pond measurements uploaded?

No. The estimate runs locally in your browser; your measurements are not sent to a server or saved by this tool.

Should I use average or maximum depth?

Use average water depth for the simple volume estimate. Use the deepest point as maximum depth for the liner-size estimate, which applies that depth around all sides.

Does this tell me the exact liner size to buy?

No. It estimates a rectangular sheet with the entered overlap. Slopes, shelves, folds, anchoring and supplier installation requirements may need more material; confirm dimensions with the liner supplier.