It's really hard to determine proper dosing for both types of butters.
Here's a generic formula you can experiment with that seems to work out well and usually prevents me from taking more than I want.
1. % of THC in your strain X total weight used for edible = THC max
Ex: (10% strain X 14g used for edible = 1.4g THC max)
2. Decarb conversion rate X THC max = Decarb max THC. (go with a conservative 90% conversion rate)
Ex: (.90 X 1.4g = 1.26g decarb max THC)
3. Decarb max THC X infusion rate = Infusion max THC (again, go with a conservative 90% infusion rate)
Ex: (1.26g potential THC X .90 infusion rate = 1.13g infusion max THC)
4. Convert your infusion max THC to milligrams (1000mg = 1 gram so infusion max THC =1130mg) and divide your infusion max THC by the amount of fat you're using in grams.
Ex: (2 sticks of butter = 226 grams. 1130mg / 226 = 5mg THC per gram of fat)
5. Now that you know how many mg of THC you'll get per gram of fat, all you need to do is determine the total grams of fat per serving and multiply that by your THC per gram.
Ex: (226 grams of fat used in a brownie recipe and divided into 10 individual servings = 226g / 10 = 22.6 grams of fat per serving X 5mg THC per gram of fat = 113 mg of THC per serving.
This should get you within about + or - 15% of where you want to be. Tolerance varies, and the state of Colorado says that an individual serving of THC should be 10mg. Meanwhile, some folks can throw down 100mg with no problems, and others laugh at 500mg. Good luck.