I think soap wieght is irrelevant, as there are different densities of soap, eg soft maliable soaps and milled soaps. I have a 65g puck of Edwin Jagger that is far outlasting my 100g puck of Provence Sante, my 50g shave sticks are better for travel, I'd like to get a Kilo of Cella so as to never run out, and I got and 85g puck of SCS the other day that doesn't seem like enough. I'm more concerned about density, and size so that it'll fit my mugs.