I think it is a waste of time to calculate things like this - it just unecessarily complicates a simple procedure which is to each as much as you can around the clock and lift really heavy. Aim to put on 1kg/month, expect to put on a bit of fat at the same time as you put on muscle and diet it off later. Eat healthily, avoid fat and sugar. I suggest drinking skim milk constantly. I know this works because I've done it - I started at about 75kg and now weigh 98kg and bench press 185kg (in a powerlifting shirt).
You seriously have to concentrate on the quantity of food you will consume - basically controlled force feeding. Most gym bunnies don't get this basic concept.
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