How to Calculate your Pond Capacity

Dan Everton explains why it is important to calculate your correct pond capacity, to enable the right level of filtration to be chosen for your pond and to provide a guide as to the minimum flow rate required in conjunction with any pond filter.

Created by Dan Everton on Wednesday, 25th of March, 2015.


Koi Pond

You can easily calculate your pond capacity by measuring the length, the width and the depth of your pond in feet. If your pond is not a regular shape you will need to work out the average of all sizes and use this to calculate the capacity.

Once you have all three dimensions you need to multiply these all together, and then multiply this calculation by 6.25.

e.g. a pond that is 10 feet long and 10 feet wide and 2 feet deep would use the calculation: 10 x 10 x 2 = 200

200 x 6.25 = 1250 gallons (remember this is a guide!).

If you require this capacity in litres, which most companies now work with, you will need to multiply the number of gallons by 4.5

e.g. calculate the number of litres by knowing the pond is 1250 gallons: 1250 x 4.5 = 5625 litres.

Again this will give you a guide…

This calculation also works the opposite way. To find the number of gallons if you know the number of litres, you divide instead of multiplying:   

e.g. to calculate the number of gallons if you know the pond is 1250 litres:

1250 / 4.5 = 277.77 gallons (simple….)

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