Teach Soap

I've not yet acquired a wooden mold yet, so I am resorting to cardboard boxes. When I try to figure out how many ounces of soap I need to fill the particular shape, I place a garbage bag over it and fill it with water. Then I pour and measure the water. So then, lets say I need 55 oz of soap. I use the soap calc (great tool) to start attempting to come up with a formula. Next I need to go a step further for the water/lye amount. I always have to go back and forth to come up with just the right total. But lo and behold, I screw up! Is there an easier way???? Does a cubic inch of water and a cubic inch of soap the same? Also, is there a general consensus on the size of a bar of soap in length, width and height and weight? Uuma says thank-you very much!

To fill a certain size mold, I go by width X length X height, then multiply by 0.37 . That is how much will fill the mold. Then I play around on soap calc til I get weights I need. I discount my water, so I use The Sage lye calculator as I can adjust the water and the weight of the oils to fit a particular mold.

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Irena
Closed minds are like faulty parachutes; they refuse to open.