Pond Calculator: Volume, Liner, Pump and Fish Capacity

Your details

For rectangular, oval or triangular ponds enter the longest dimension. For a round pond enter the diameter.
ft
Shortest horizontal dimension of the pond.
ft
Use the average depth of the pond, not the maximum. For a flat-bottom pond, average depth equals maximum depth.
ft
Extra liner to fold over each edge for anchoring. 1-2 ft (0.3-0.6 m) is standard.
ft
The stocking rule changes by fish size. Koi need more water per fish than goldfish.
How often the pump should circulate the full pond volume. Every 1-2 hours is recommended for fish ponds.
Leave at 0 to skip cost estimate. Enter the price of your liner per square foot or metre.
$/ft²
Check your utility bill for the cost per 1000 gallons or 1000 litres. Leave at 0 to skip.
$
Volume (gal / L)Medium pond
1,436

Water volume - gallons in imperial mode, litres in metric mode

Surface area96
Liner length needed19
Liner width needed15
Liner area285
Min. pump flow rate1,436GPH
Max. fish capacity28
Liner length19
Liner width15
Liner area285

A 1436-gallons rectangle pond

  • Your pond holds approximately 1436 gallons. The surface area is 96.0 ft².
  • You will need a liner sheet at least 19.0 x 15.0 ft to cover the pond with the specified overlap.
  • A pump rated at 1436 GPH will circulate the entire pond volume every 1 hour, which is the recommended turnover for a healthy pond.
  • At the standard stocking guideline, this pond can support up to 28 adult goldfish. Overstocking quickly degrades water quality, so always start with fewer fish.

Next stepSize your filter to handle at least the pump flow rate. For koi ponds, a filter rated for double the actual fish load is a common rule of thumb.

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