Pond Volume Calculator
Knowing your pond's volume in litres is the starting point for sizing a pump, UV clarifier, or filter correctly, and for dosing water treatments accurately — most treatment instructions are given per litre or per 1,000 litres. Use the calculator below: choose a rectangular or irregular shape, enter your measurements in metres, and it will estimate the volume instantly. Once you know your volume, check our pond pump and UV clarifier ranges to find equipment rated for it.
Pond Volume Calculator
Work out your pond's volume in litres to correctly size a pump, UV clarifier, or treatment dose.
Frequently Asked Questions
Why do I need to know my pond's volume?
Pumps, filters, UV clarifiers and water treatments are all rated or dosed by volume. Undersizing equipment for your actual volume is one of the most common causes of poor water quality and recurring algae problems.
How accurate is this for an irregularly shaped pond?
The irregular-shape option estimates volume at roughly 80% of the equivalent rectangle, which is a standard approximation for oval, kidney, and free-form ponds. For the most accurate result, measure depth at several points around the pond and enter the average.