I don't know the exact conversion...it will depend a lot on your conversion efficiency and extraction rate of your mash...but it will be a lot more grain than a 1:1 ratio. So, to really replace that can of extract, I'd say you need to mash at least 6 pounds of grain...maybe more? Just a guess. I'd have to look up some more real numbers, but in any event it depends a lot on your mash efficiency. Cheers!
Oh don't give me none more of that Old Janx Spirit
No, don't you give me none more of that Old Janx Spirit
For my head will fly, my tongue will lie, my eyes will fry and I may die
Won't you pour me one more of that sinful Old Janx Spirit