Frequently Used Pond Calculations

Pond Liner Calculations

Length = (Maximum Depth x 2) + Maximum Length + 2 ft.

Width = (Maximum Depth x 2) + Maximum Width + 2 ft.

Example: An 8' x 10' x 2.5' would require a 15' x 17' Liner

We custom cut pond liners in widths ranging from 5 feet to 30 feet in 5-foot increments.

Pond Volume Calculations

Pond Volume (in gallons) = Average Length x Average Width x Average Depth x 7.48

Example: A 12' long and 10' wide pond with a depth of 2 feet would be 1795.2 Gallons

Round Pond Volume (in gallons) Radius Squared x 3.14 x Average Depth x 7.48

Example: 10' round pond by 4' deep would be 2480 gallons

Fish Calculations

First, determine the surface area of the pond (Length x Width) or Area of the circle for the round pond (3.14 x radius squared).

To then determine how many fish: 1 inch of fish per square foot of the surface area is safe; 2 inches per square foot would require testing water weekly for nitrites, ammonia, and pH; 3 inches or more per square foot requires testing and bio-filtration.

Pump Size

Total gallons of pond divided by 3 = Minimum pump size for filtration only. Otherwise, pump volume should be determined by the feature to be created.

View our available pond pumps.