Decoction Formula

[Norsman]

Heya, I am constructing a spreadsheet type thingy to help me in my brew day calculations. I was wondering if anyone knows the formula for calculating decoction volumes. I seem to be having trouble finding anything useful on the net.

 

[Adamt]

I'm pretty sure Promash and Beersmith have those calculations in-built. If not.... single infusion with melanoidin