That will give you a good approximation of the content as long as everything is mixed thoroughly. The issue with edibles is that the effect that you obtain from then can vary on a multitude of factors, even though each piece might have almost the same THC. The time of day, what you have eaten prior to ingesting the edible, when you eat something after the edible, how much fat or grease is in the food that you have eaten all can make a difference in the effect that you feel and how long it takes to act.
Perry Solomon, MD