How to calculate pond size

April 2, 2017

My husband I bought our first house a couple of years ago, and it came with a pond in need of a lot of TLC. Our first step in cleaning it up is to figure out how big it is so that we know how much product to use. Most chemicals specify 'acre-feet' as a measurement of product application. 

Acre-feet= surface area (ft²) x depth (ft)

OR Acre-feet= acreage x depth (ft)


There are map tools on the internet that you can use to find the surface area of your pond. We used this website- enter your address in the search bar and highlight the pond area. Our pond is13,000 feet², which is 0.30 acres. The depth isn't an exact calculation, it is based on an average. Our pond is an average of 4 feet deep. Be sure to consider the slope of the sides when figuring the average depth. 

So, to calculate our acre-feet:

(13,000 ft² x 4ft)/43,560 = 1.2 acre feet OR 0.30 acres x 4 ft = 1.2 acre-feet 



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