Volume calculator
Not sure how much water your tank holds? Use the calculator below to work it out from the internal length, width and height.
Important: When estimating volume for supplements or treatments, also add the volume of your sump if you have one. The optional sump fields below will include it in the total.
Aquarium volume calculator
Internal size · Length × width × height
Display tank
Sump (optional)
0.0
Litres
0.0
US gallons
How it is calculated
Internal length × width × height. In centimetres that is divided by 1,000 for litres. In inches it is divided by 231 for US gallons.
Use litres for dosing
Most aquarium products in Australia are dosed in millilitres per litre. Use the litre total, not gallons, unless the label says otherwise.
Empty-tank figure
This is glass-to-glass volume. Rock, sand and equipment displace water, so actual water volume is a little lower.
