I once put asite up here that approxtimated the amount of gallons there were in a tank..but well I can't find it here anymore..anyone have a site where you just type in the measurements and then you get the gallons?
Yeah I found a website which looks nice. fish profiles the go to interactive and the menu will open and click calculator.
If you know how many liters it is but want to know how many gallons it is, go down to the "Convert Liters to Gallons" bit, and just type the litres in and press convert and it will tell you how many gallons your tank is.
Hope this helps.
Also scroll down to the bottom of the page click on " Aquarium Calculator"
Go to then go all the way to the bottom of the page find the gallons on Calculate Fish Tank Volume in Gallons Based on Tank Size ;D