Yes. @goldendawne, you can calculate how strong each portion of an edible is, if you know the % of THC of the buds you used, the amount of infused butter used and the number of portions that your recipe yields. If your bud came from a grower directly and wasn’t tested for its THC % then you cannot calculate how potent each portion is. There’s no way to know if you don’t know the original % that you started with.
There are other factors too like how much cannabis was used to make the butter, then how much butter was used in the recipe...hope this helps. :)