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To calculate CBD concentrations, you have to convert the percentage of CBD in the flower to the number of milligrams in the volume of the flower. From there, you separate the volume into milligram servings based on your dosing requirements; that may be anywhere from five to a couple of hundred milligrams depending on your needs.

Don’t worry; you don’t need some fancy graphing calculator to figure this stuff out. The app on your phone is just fine. Here’s an example.

You have 1 gram of 15 percent CBD flower, and you want a 10-milligram dose per 1 tablespoon of oil. Convert 15 percent to a decimal (divide 15 by 100) to get 0.15.

Convert 1 gram to milligrams; 1 gram is 1,000 milligrams. Multiply 0.15 by 1,000 to get the amount of CBD per gram of flower.

0.15 CBD × 1,000 milligrams = 150 milligrams/1 gram of flower

For a 10-milligram dose, divide 150 by 10 to get the number of servings.

150 milligrams CBD/10 milligrams CBD = 15 servings

Therefore, you need 15 tablespoons of oil for 1 gram of flower to have a 10 milligram/1 tablespoon ratio of CBD to oil.

Two grams of the same flower would be 300 milligrams per gram of flower (2 × 150 = 300), 3 grams would be 450 milligrams, and so on.

If you decide to infuse butter and bake with it, the same math applies.