What does THC stand for? THC is short for tetrahydrocannabinol, the main chemical in the cannabis plant that changes how a person feels and thinks. When people talk about the "high" from marijuana, THC is the compound behind it. The most common form is called delta-9 THC, and that is what most labels and laws mean by plain THC.
Because the chemical name is long and hard to say, almost everyone uses the three letters instead. You will see them on product labels, in news about state laws, on workplace drug test forms and in science classes that cover plant chemistry.
Quick facts
Stands for
TetrahydrocannabinolMain form
Delta-9 THCType
Initialism from a chemical nameHow to say it
T H C; the full word is TET-ruh-hy-dro-kuh-NAB-uh-nawlFound in
Cannabis plants, including marijuana and, in small amounts, hempNot to be confused with
CBD, cannabidiol, which does not cause a high
What does THC stand for, piece by piece?
The letters do not match three separate words. They come from pieces of one long chemical word:
| Letter | Part of the name | Rough sense |
|---|---|---|
| T | Tetra | Four |
| H | Hydro | Hydrogen atoms added to the molecule |
| C | Cannabinol | The family of cannabis compounds it belongs to |
Chemists use the name to describe the shape of the molecule. Everyone else uses THC. Since you say each letter, the term belongs with initialisms, a label covered in acronym vs abbreviation.
What does THC and CBD stand for, and how are they different?
The two names are often seen side by side on labels. THC is tetrahydrocannabinol. CBD is cannabidiol. Both are cannabinoids made by the same plant, but they act very differently in the body.
- THC is intoxicating. It is the compound that produces the high.
- CBD is not intoxicating in the same way, and it is sold in many forms such as oils and lotions.
- Products may contain one, the other, or both in a stated ratio, such as 1:1.
A label line: "CBD 25 mg, THC less than 0.3%." This means the product is mostly CBD, with only a trace of THC.
THC on labels, laws and drug tests
The THC number on a package tells you how much of the compound is in it. Edibles usually list milligrams per serving. Dried flower and oils often list a percentage. Labels may also mention THCA, the raw acid form in the fresh plant, which turns into THC when it is heated.
Rules differ from place to place. Some states allow adult use, some allow only medical use, and some allow neither. Federal law treats a cannabis plant as hemp when its delta-9 THC level stays at or under 0.3 percent of dry weight, which is why that number appears so often.
Workplace and sports drug tests often look for what the body leaves behind after THC is broken down, not THC itself. A form may list it as THC or as cannabinoids.
Other kinds of THC you may see named
- Delta-9 THC: the main form, and the one most people mean.
- Delta-8 THC: a closely related compound that the plant makes only in tiny amounts, so most of it is made from CBD in a lab. Its legal status is debated and differs by state.
- THCA: the acid form found in the living plant before heat changes it.
- THCV: a different cannabinoid with a similar name, found in some plant strains.
The extra letters and numbers point to small differences in the molecule. Labels are expected to say which one a product contains.
THC stands for one thing, so why the confusion?
Three letters this short can overlap with other uses, but in daily life THC almost always means the cannabis compound. A few mix ups come up:
- THC vs CBD: covered above; one causes a high and one generally does not.
- THC vs hemp: one is a chemical, the other a crop grown to contain very little of it.
- THC vs BAC: BAC measures alcohol in the blood. Police and labs measure THC differently, and there is no simple matching number.
Using the letters in a sentence
- "The package lists 5 mg of THC per piece."
- "This lotion is CBD only and contains no THC."
- "The lab measured the THC content of each sample."
- "Our state changed its THC rules last session."
Write THC in capital letters with no periods. Plenty more letters from labels and headlines appear in our famous acronyms roundup.
Questions people ask
Which chemical name hides behind THC?
The full name is tetrahydrocannabinol. The form found most often in cannabis is delta-9 tetrahydrocannabinol, which is why you may see delta-9 THC on labels.
Does CBD have THC in it?
Some CBD products contain small amounts of THC, and others are labeled THC free. The label or a lab report should list how much, if any, is present.
How do you pronounce THC?
Most people say the letters, T H C. The full chemical name is said TET-ruh-hy-dro-kuh-NAB-uh-nawl.
Is THC the same as marijuana?
No. Marijuana is the plant material, and THC is one chemical in it. The plant contains many other compounds as well, including CBD.
Why do labels say 0.3% THC?
That number marks the federal line between hemp and marijuana, measured as delta-9 THC by dry weight. Products above that line are treated differently under the law.