Is there a sand calculator?

[newbie-to-reef]

I saw on a post a while back that there is a sand calculator on here some where, but I can't find it. I have an awesome opportunity to change out my CC for live sand out of a lfs tank (They are going out of buisness) but I have no idea how much I would need. I have a bowfront 29 gal tank 24"x 12" approx

 

[acrodave]

on the home page a little over half way down on the left side

 

[newbie-to-reef]

thanks a bunch

 

[twoodall]

most of the web sites that sell live rock and live sand have calculators as well. But nothing more handy than having it here on RC!