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Isolate: Need Help Determining How Much Oil to Use? Confused by the Math? Look No Further!

Posted by Corey Hartley on

A Math Tutorial For Making Your Own CBD Infused Tinctures, Topicals, Edibles, Vape Solutions, and High-Potency Cannabinoid Oils 

Determining CBD Concentration Depending On Amount of Oil Used When Adding 1 Gram of 99%+ Pure CBD Isolate

If this is your first time making CBD isolate infusions, check out our basic recipes here: CBD Isolate Tincture and CBD Isolate Topical


In these calculations, I will be demonstrating the math needed to determine how much oil to use to dissolve your CBD isolate from DiscoverCBD. First, I must convert a larger measuring unit, such as cups of oil, into a smaller unit of measurement, such as teaspoons or milliliters, using the conversion factors below. Then, the total amount of CBD, which for these calculations is 990 mg CBD per gram of isolate minimum, is divided into the total number of units used to measure the serving size (which is the answer from the first calculation converting the units).

Conversion Factors:

1 cup = 8 ounces

1 ounce = 2 tablespoons

1 tablespoon = 3 teaspoons

1 teaspoon = 4.93 milliliters

1 ounce = 29.57 milliliters

CBD Topical: Active CBD Oil Super Strength 150 mg Cannabidiol Salve

CBD Topical concentration measured in milligrams per teaspoon when using this much oil:

                2 cups:  2 cups x 8 oz x 2 tbsp x 3 tsp = 96 teaspoons = 990 mg/ 96 tsp = 10.31 mg per tsp

                1 cup: 1 x 8 x 2 x 3 = 48 teaspoons = 990 mg/48 tsp = 20.62 mg/tsp

                ½ cup: ½ x 8 x 2 x 3 = 24 tsp = 990 mg/24 tsp = 41.25 mg/tsp


CBD Tincture and E-juice concentration measured in milligrams per milliliters when using this much liquid:

***CBD vape solutions should NOT be made using any oil due to the risk of Lipid Pneumonia. Propylene Glycol should be used instead***

                1 cup: 1 cup x 8 ounces x 29.57 milliliters = 236.56 mL = 990 mg/236.56 ml = 4.18 mg/ml

                ½ cup: ½ x 8 x 29.57 = 118.28 ml = 990 mg/118.28 ml = 8.37 mg/ml

                ¼ cup: ¼ x 8 x 29.57 = 59.14 ml = 990 mg/59.14 ml = 16.74 mg/ml Active Cannabidiol tinctures, CBD Oil

High-Potency CBD Oil concentration measured in milligrams per milliliter when starting with this much oil:

                1 Tablespoon: 1 tbsp x 3 tsp x 4.93 ml = 14.79 ml = 990 mg/14.79 ml = 66.94 mg/ml

                2 Teaspoons: 2 tsp x 4.93 ml = 9.86 ml = 990 mg/ 9.86 mg = 100.41 mg/ml

                1 Teaspoon: 1 tsp = 4.93 ml = 990 mg/4.93 ml = 200.81 mg/ml


Edibles: Determining the concentration for edibles is somewhat of a more complicated process because you need to work backwards taking into consideration how many edibles you want, how much oil the recipes calls for, and how strong you want each of the edibles.

First, you would need to find a recipe for the edible you want, preferably one that calls for an oil, because it greatly simplifies the process and you will be able to follow the standard recipe after infusing your CBD into the oil.

I love chocolate, so I will be using our CBD brownie recipe as an example. In this example, I also use 1000 mg as the amount of CBD in the isolate for easy math, although the actual amount is closer to 990 mg.

This recipe makes 10 brownies and calls for ½ cup of oil. An average dose of CBD per day for me is about 20-40 mg, so I am going to make each of my brownies 20 mg. If I want to make 20 brownies at one time, I need to double the recipe. Therefore, it is ½ cup of oil doubled, meaning I need 1 cup of oil total.

If I am making 20 brownies at 20 mg per each brownie: 20 x 20 = 400 mg CBD total

Since I need 400 mg CBD total, and I need 1 cup of oil total, then I need 400 mg CBD per 1 cup of oil.

Working backwards to determine how much oil to use for the desired concentration, with my 1000 mg of CBD in isolate form:

400 mg per cup, 1000 mg total CBD -> 1000/400 = 2.5 times the CBD needed for the 20 brownies, so I need to use 2.5 x 1 cup (for the concentration needed for 400 mg per cup), which totals 2.5 cups of oil.

Therefore, I need to infuse my 1000 mg of CBD into 2.5 cups of oil for a concentration of 400 mg per cup.

I will use the 1 cup of oil containing 400 mg CBD for the 20 brownies, and I will save the other 1.5 cups of CBD infused oil containing 600 mg CBD for later use.


Want more ideas on what you can do with CBD isolate? Check out our whole collection of ideas here: What can I do with 99% CBD Isolate? 

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