In order to apply the correct amount of product to your pond or water garden, you need to know the size of it. Below is a calculator you can use to determine the volume, acre-feet, square footage and surface acreage of your pond or water garden.

First you will need to gather the following measurements for your water body:

• Length in feet (L)
• Width in feet (W)
• Average Depth in feet (D)

Then, enter the values below in feet and decimals of feet (for example 10 1/2 feet would be entered as 10.5):

The values provided by this calculator can be used for applying biological or chemical products to your pond or water garden. Most of the product labels have an application rate that is based on acre-feet or surface acres for ponds, and square feet or gallons for water gardens.

Helpful Conversions:

• 1 cubic foot = 7.5 gallons
• 1 surface acre = 43,560 ft2
• 1 acre-foot = 375,851 gallons
• 1 acre-foot = the volume of water needed to cover one surface acre, to a depth of one foot