cbd oil bottles

How much THC, CBD, or other cannabinoids are in your homemade oil? I made this useful calculator to help you figure that out.

As someone who wants to make their own CBD or THC oil at home, this is a critical question. You need to know how many milligrams of CBD are in each milliliter of oil.

If you’re making your own CBD oil at home, don’t forget to check out my easy homemade CBD oil guide!


Steps for using the CBD THC Potency Calculator:

cbd thc oil potency calculation
(Click to enlarge)

The calculator is very simple. Follow the steps below to determine how potent your cannabinoid oil infusion will be. In order to use the calculator you need to know what percent cannabinoid your flower is.

Step 1: Figure out Total CBD or Total THC Percentage

CBD and THC start out in flower as CBDa and THCa. When you decarboyxlate (add heat) it changes to to CBD and THC, respectively, at a maximum rate of 87.8%. In other words roughly 12% of the cannabinoid in the flower is destroyed when it converts.

So when you’re trying to determine the total amount of CBD or THC in your flower, you need to take the percentage of CBD or THC and multiply it by 0.878 to account for the 12% lost during decarboxylation. That’s the number you should enter into the calculator above.

Your vendor might have given you a lab test with your flower. The lab test should show the level of CBDa, CBD, and a total CBD number (CBDa + CBD). Type the total CBD number in the calculator above.

If you don’t have a lab report, you can simply multiply CBDa percentage by 0.878, then add that number to any existing percentage of CBD to arrive at the total amount of CBD.

Most lab results will provide each number for you (CBDa, CBD, Total CBD) and you want to use the Total CBD/THC number for the calculator above.

Step 2: Put percentage number into form

Type the total amount of CBD flower, or amount of isolate, in grams, that you plan to use. If you’re using isolate you may be using less than one gram. To type a milligram amount, simply use a decimal number. 1 milligram should be typed as 0.001. 500 milligrams should be typed as 0.5

Step 3: Type amount of oil to be used into form

Type how many cups of oil you’re considering infusing the CBD into.

On the bottom of the calculator you will see the total milligram amount of CBD that will be present in your entire oil infusion, if you choose to use the amounts typed in Steps 1-3.

If you want a weaker or stronger oil infusion, you have a few options:

  • Use CBD flower with lower or higher CBD content, depending whether you want lower or higher cannabinoid concentration in your oil infusion.
  • Use more or less quantity of CBD flower, or use more or less isolate, depending whether you want lower or higher cannabinoid concentration in your oil infusion. 
  • Use more or less oil. Using more oil without adding additional flower or isolate will weaken the potency. Using less oil without changing the amount of flower or isolate will make your oil infusion more potent.
  • There are limits to how much you can infuse into a certain amount of oil. I don’t know the limit but I know from experience only so much decarbed flower will fit into 1 cup of oil for infusion.

For Recipes:

Step 1:

Complete all steps listed in first part of calculator, described above.

Step 2:

Look at the potency per teaspoon and type in how many teaspoons of oil you’ll use for your entire recipe. Then type in how many servings are in your entire recipe, and you’ll see how potent each serving will be.

Need some good recipes for your completed cannabinoid oil? Check out WakeAndBake.co or Laurie + Mary Jane.