Mako

12" wide x 30 long x about 18 1/2 tall An ad for a fish tank, if i did the math right i got 378.5 cubic inches...how can/what is the gallons of that?

jdhef

28.83 US Gallons

Slug

I got 28.68421052631579.

Reguardless, right at about 29gals.

Tom

You multiply all the dimensions together and then you go and divide the final product by 231 and you will get how many gallons the tank is. Unless it is a weird sized tank, then there are sites that calculate that for you.
Tom

Mako

Thanks all!

Ghostfish

Just keep this bookmarked:

http://www.lenntech.com/unit-convers...tor/volume.htm

tkfury

There is also a calculator right here at fishlore
http://www.fishlore.com/ConversionCalculator.htm
Comes in handy with liters to gallons, celsius to fahrenheit and such as well