Often times people will ask you, "what size is your tank?" Do you give them the dimensions? Do give them gallons? It's easy enough to measure the dimensions of your enclosure, but how do you determine how many gallons it is? These questions seem to come up time and time again. So, I've decided to write this brief article explaining the conversion and provide a little tool to use.

The basic formula to convert cubic inches into US gallons is:

Length x Width x Height / 231 = Gallons

That's it. Now you can easily do the math. Or if you're like me and don't want to find your calculator, pen/paper, or open up your calculator application, here's a little web tool to do the conversion for you. Just enter the dimension in inches, and click the "=" sign.