How to Calculate Aquarium Volume
Measure the aquarium's inside length, width or depth, and water height. Enter all three measurements in the same unit.
Rectangle Tank Formula
For centimetres, multiply length × width × height, then divide by 1,000 to estimate litres. The calculator converts inches and feet automatically.
Why Actual Water Volume May Be Lower
Substrate, rocks, equipment and space above the water line reduce the water actually held by the tank. Use the setup allowance that best represents your aquarium.
Common Tank Measurement Units
You can enter centimetres, inches or feet. Results are shown in litres and gallons and can be carried into supported product dosage guidance.