I'm looking for a piece of script that will enable me to add a calculator to my site so people can put him the size of their aquaria and find out how much water it holds. I have added a link to an example of what I'm looking for. http://www.oscarfishlover.com/component/option,com_wrapper/Itemid,123/
I was thinking the same thing... anyway, the calculator in that link you gave is all JavaScript. Not saying that you should, but it's easy enough to just copy it and paste it wherever!
it would be that times by 90% or something as you dont fill it to the very top and the gravel/ ornaments etc will take up some of the space too. Not sure how useful it will be - would have thought a calculator to say how many fish you can have in the tank given its size/ what size filter needed etc would be much more handy.