๐พ Pets
Fish Tank Volume Calculator
Tank volume depends on the shape, and manufacturers round generously: a 40 gallon breeder holds noticeably more usable floor area than a 40 gallon tall. Length and width matter more than height for most fish because they swim horizontally.
How it works
Tank shape
Length or diameter
Width
Height
Show volume in
Volume
Volume
Volume
Time to fill with a 5 gal/min tap
Frequently asked questions
How do I use the Fish Tank Volume Calculator?
Fill in the fields above โ the result recalculates instantly as you type. Everything runs in your browser, so the values you enter are never collected or stored.
Is this calculator free?
Yes. It is completely free, requires no account, and works on phones, tablets and desktops.