To calculate THC amounts in edibles, we’ll assume that the cannabis flower used contains 10% THC to simplify the method. If you know the percentage of THC in your strain, or use our THC percentage chart, you can adjust the following formula accordingly –
- 1 gram of cannabis = 1000 mg
- X 10% THC = 100 mg
- 1 gram of cannabis = 100 mg THC
Now, you’ll figure out the total amount per the number of grams you used in your butter or oil base. Because 3.5 grams is the standard amount of cannabis flower to oil, we’ll use this as an example.
100 mg THC x 3.5 g cannabis = 350 mg THC in 1 cup of butter or oil
Lastly, to figure out your ‘per dose’ mg amount just divide the total amount of butter or oil that was used in the recipe. So, if you used 1 cup of butter or oil with 350 mg to make a batch of 15 cookies, each cookie contains approximately 23 mg of THC. If you only used ½ cup of the butter, you’ll divide 350 by ½ first, equaling 175 mg. Then 175 mg divided by the total amount of pieces the recipe makes.