Hey Napper:
I remember a thread where they talked about this here.
It’s sort of like using old physics conversion formulas from high school. I have quite a few laid out depending upon if you’re looking to figure out the approximate density of a piece with known dimensions and weight, or if you’re attempting to determine what the weight of a piece “should” be with know density and dimensions.
If you have a specific scenario, let me know and I’ll be happy to lay out in “longhand” the appropriate conversion calculation, but it might have to wait until I am back in my store on Monday.
Jeff Scheuer
Mattress To Go