I have 100g of top-shelf Sour Diesel. I know that top shelf is always approximately 20%, or 200mg THCA per 1g of flower. 200mg x 100 = 20,000mg THCA.
The conversation from THCA to THC is . 20,000mg x = 17,600mg maximum THC available to be extracted.
Under ideal conditions, you get a 60% efficiency of extraction in dairy butter, so 17,600mg x = 10,560mg maximum THC likely to be extracted.
If my targeted dosage is 200mg per brownie, then 10,560mg / 200 = 53 brownies containing 200mg each. This is the maximum those brownies will have; they could have a whole lot less depending on cumulative errors.
Have you ever had a hard time estimating the potency of your homemade edibles? Share your story in the comments!