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How to Calculate the Water Volume of your Garden Pond

The easiest and most accurate way of calculating the volume of your pond is to fill it up while using a water meter. The issue most of us will have with this is that you need to start with an empty pond and have a hose connected to a standalone water meter. If you are building a new garden pond and haven’t filled it yet, then this is the best method.


You simply note the meter reading before you start filling and once you have finished. Then subtract the initial meter reading from the second to calculate the difference. This is your Pond volume including all your pipework, filtration, UV units, Heaters etc. In this blog post we are going to discuss how you can calculate the total water volume of your Garden Pond, i.e. how many litres or gallons of water does your koi pond hold when full.


Once you’ve filled your pond up a water meter is still a useful gadget to have as it allows you to track how much water is passing through your purification filters, so you know when it’s time to replace them. For most of us, we already have our pond up and running and we don’t want to drain it down and refill just to calculate the volume of water it contains. Luckily, you don’t have to, we’ll look at the various options available below.