Calculating Pond Volume

For ponds that are significantly square or rectangular, use this formula:

Length x Width x Average Depth x 7.5 = Gallons

Example:

A rectangular pond is 90' long by 40' wide with an average depth of 4'.

90 x 40 x 4 x 7.5 = 108,000 gallons of water

------------------------------------------------------------------------------------------------------------

For ponds that are significantly circular, use this formula:

Diameter x Diameter x Average Depth x 6 = Gallons

Example:

A circular pond is 125' across with an average depth of 5'.

125 x 125 x 5 x 6= 468,750 gallons of water

------------------------------------------------------------------------------------------------------------ 

For ponds that are significantly elliptical, use this formula:

Length x Width x Average Depth x 6 = Gallons

Example:

An elliptical pond 200' long by 80' wide with an average depth of 6'

200 x 80 x 6 x 6 = 576,000 Gallons of Water

 

If you need to know how to figure Surface Acreage, read this page.