The single most important step when cooking with cannabis. Learn decarboxylation and not be nervous about putting your cannabis in the oven!

Decarboxylation, often referred to as “Decarb”, is a chemical reaction that removes a carboxyl group and releases carbon dioxide (CO2). Usually, decarboxylation refers to a reaction of carboxylic acids, removing a carbon atom from a carbon chain.

In cannabis, when the THC-a acid is heated above 220 degrees F a chemical reaction activates the THC-a compounds and converts them to THC, the main psychoactive cannabinoid found in cannabis. Decarboxylation is the most important step when cooking with cannabis as you want activated THC to be infused into your mediums.

Decarboxylation also releases the flavours/terpenes into the mediums we are using. Be it butter, oil, tincture, cream, honey, maple syrup, or flour.

In this lesson you will learn the times, temperatures, and techniques we use to decarboxylate cannabis.

Storage: Best to keep your decarboxylated cannabis in an air tight jar in a cool dark area, away from sun.

Let’s Get Started

Decarboxylation conversion is THC-a X .88. When you start cooking with cannabis you should know the THC percentage, this number is important. If you do not know the THC percentage, most top shelf cannabis is 20% & higher, where mid THC grades are around 12-15%, and low THC strains are 10% and below.

What this means;

DecarboxylationIf you have 15 grams of 22% THC raw flower. The 22% refers to the amount of THC-a per gram of raw cannabis flower, so 22% of 1000 is 220. So, 1 gram of 22% cannabis equates to 220mg of THC-a.

So 220mg of THC-a X 15 grams gives you 3,300mg of THC-a.

When you decarb you transform the THC-a molecules into THC and the conversion mathematics is THC-a X .88. You will take the 3,300mg of THC-a and multiply it by .88, which will equal 2,904mg THC.

Decarb is done at 240 degrees F for 30-45 minutes and 10 degrees higher for CBD.

Now you know that your 15 grams of decarboxylated cannabis will contain 2,904mg THC and ready to infuse in the following mediums.

If you are interested in becoming a medical cannabis patient, please reach out to Spartan Wellness.

Extra sheets for mathematics.


Starting amount of grams = 15g
THC percentage per gram = 22% (revert to decimal)
Milligrams per gram .220 mg per gram
Amount of grams X milligrams (15 X 220) = 3,300mg THC-a
THC-a X .88 (Decarb) = 2,904mg THC
THC X .80 (For Loss) = Total

Starting amount of grams = _____g
THC percentage per gram = _____% (revert to decimal)
Milligrams per gram _____mg per gram
Amount of grams X milligrams = _____THC-a
THC-a X .88 (Decarb) = _____THC
THC X .80 (For Loss) = Total _____mg

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Next Video – Butter & Flour

Course Outline: