When selecting pond filter or when using pond water treatment products you have to know the volume of your garden pond. Below you will find 3 different guides/methods for calculating the pond volume.

Measure the pond volume while filling the pond with water
If you have a water meter you can check the meter before and after the pond is filled with water. If you do not have a water meter you can calculate the amount of water being taped into the pond.

With the time method you take the time it takes to fill the pond using a constant flow of water. Then you can calculate the volume of the pond.

To calculate the pond volume when the pond is already filled with water
To calculate the volume of an irregular shaped pond you have to use an approximation of length, width and depth. Below you will find two guides to help you make a qualified estimation of the pond volume.

With the check pattern method you draw the outline of your pond on a square graph paper and count the squares. This method lets you make a good estimate of the volume of any irregular shaped pond. The guide also contains an easy to use drawing tool.

With the "adding" regular shape method you split a complex shaped pond into several regular shaped areas. By adding the volume of each regular shape you get a good estimate of the pond volume.

Select a sketch to start with.

Continue to step 2 - guide for computing the pond volume with a sketch drawn on a squared graph paper.

Adjust the shape of the pond in the selected sketch

Select depth-zone you want to edit (click on a blue square):
Depth 1 - swamp zone
Depth 2 - Shallow water zone
Depth 3 - Deep water zone

Measure length, width and depth of the pond. Count number of squares inside the pond. Squares partly inside the pond are added together.

Enter the values in the table below.

The shape of a garden pond is often complex and it might be difficult to compute its volume. You have to use average values for length, width and depth. To get a more accurate result you can divide the pond into smaller regular shaped areas that is easier to compute with. This technique can also be used for the depth-zones of the pond.

Some examples of how you can divide a complex shaped pond:

This guide will help you compute the volume for several regular shapes. In this way you can make a good estimate of the pond volume.

You can use the following regular shapes:

It is important to measure length and width correct. In the above example length and width are marked with blue.

You can only use this guide when you fill the pond with a constant flow of water.