Pond Volume Calculator
A pond holds water in a shape close to a box. Enter its size and this shows how much water it holds and roughly how big a liner needs to be.
- Free
- Works offline after your first visit
- Saves on this device
- No sign-up
- Updated
How it works
Volume is length times width times average depth. For a pond that slopes, use the average of the shallow and deep ends.
A liner covers the bottom and reaches up both sides, so the size adds twice the depth plus the overlap to each measurement. Sloped banks need more liner than this shows.
Worked example
A pond 20 ft by 12 ft with an average depth of 4 ft holds 7,181 gal of water, and a liner about 32 ft by 24 ft would cover it.
Questions
Is the liner size exact?
No. It assumes straight, vertical sides. For sloped banks, measure the actual slope and add more on each side.
How do I find the average depth?
Measure the depth at several spots, add the readings together and divide by how many you took.
Does the water level change the answer?
Yes. A pond that is not filled to the top holds less, so enter the depth of the water you have.
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