To read a cannabis label, start with the potency panel, which lists THC and CBD in milligrams per serving and per package. Then check serving size, net weight, the batch or harvest date, and the license number. Those five items tell you how strong the product is, how much you are getting, and who made and tested it.
Potency panel: THC, CBD, and total THC
The potency panel is the most important part of the label. It separates what you get in one serving from what is in the entire package, and those two numbers are not the same thing.
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- THC per serving: the amount you consume in a single dose. This is the number that matters for dosing.
- THC per package: the total in the whole container. A 100 mg package of gummies split into ten pieces is 10 mg per piece.
- CBD per serving and per package: listed the same way, and often much higher than THC in tinctures and topicals.
- Total THC: on flower labels this usually means THC plus THCA converted at a factor of about 0.877. Raw flower can show a low THC number and still be strong because most of the cannabinoid is present as THCA.
When you learn how to read a cannabis label for edibles, the per serving number is the one to check first. State rules cap servings in retail edibles, and Washington limits THC to 10 mg per serving and 100 mg per package.
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Serving size and total servings
Find the words "serving size" or "one serving equals" and note how many servings the package holds. Chocolate bars and beverages often contain more than one serving, so the whole item is not a single dose. If the label lists only total THC and no serving breakdown, divide the total by the number of pieces before you consume any.
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Net weight and product form
Net weight appears in grams or milligrams and reflects the physical product, not the potency. Flower is sold by the gram or eighth, concentrates by the gram, and liquids by volume. The product type also tells you how the label should be read: inhalable products act within minutes, while edibles can take one to two hours to peak.
Dates: packaged, harvested, tested
Freshness matters for flower and concentrates, since terpenes fade over time. Look for a packaged date, a harvest date, and sometimes a best by or expiration date. A packaged date within the last few months is a good sign for smokable flower. Old flower still works, but it tends to smell and taste flatter.
Batch numbers and lab test results
Every legal package carries a batch or lot number that links it to a specific harvest and test. Many labels include a QR code that opens the certificate of analysis, which shows potency along with tests for pesticides, heavy metals, microbials, and solvents. If a label has no batch number and no testing information, that is a red flag.
Ingredients, solvents, and added terpenes
Ingredient lists on edibles and topicals read like any food or skincare label, so check for allergens and added sugar. Vape labels sometimes note the extraction method, such as CO2 or hydrocarbon, and whether terpenes are cannabis derived or botanical. Added botanical terpenes are common and legal, but they change the flavor and effect compared with a full spectrum extract.
License numbers and required warnings
A state license number for the cultivator, processor, or retailer confirms the product moved through the legal market. Warnings cover impairment, driving, keeping the product away from children, and use during pregnancy. Federal oversight of cannabis labeling sits mostly with the states, which is why formats vary from one market to the next.
Quick label checklist
- Read THC and CBD per serving, then per package.
- Confirm serving size and total servings.
- Check net weight and product type.
- Note the packaged or harvest date.
- Find the batch number and, if available, the test results.
- Scan the ingredient list for allergens or added terpenes.
- Verify the license number and read the warnings.
Once you know where each item sits, reading a cannabis label takes about ten seconds and tells you more about the product than the name on the front of the package.