TAC stands for Total Active Cannabinoids. It’s the combined amount of all measurable cannabinoids in a cannabis gummy, not just THC or CBD alone. When you see a TAC number on a gummy package, it tells you the full cannabinoid content of that product, expressed in milligrams for edibles.
What TAC Actually Measures
TAC adds up every detectable cannabinoid in the product into a single figure. The five main cannabinoids that contribute to this number are THC (tetrahydrocannabinol), CBD (cannabidiol), CBN (cannabinol), CBG (cannabigerol), and CBC (cannabichromene). A gummy with 10 mg of THC, 5 mg of CBD, and 2 mg of CBG would have a TAC of 17 mg.
Each of these cannabinoids does something different in the body. THC is the compound that produces a high. CBD is non-intoxicating and is often associated with calming effects. CBN, CBG, and CBC are sometimes called “minor cannabinoids” because they appear in smaller quantities, but they still contribute to the overall experience of the product. The idea behind tracking TAC is that these compounds may work together rather than in isolation.
TAC vs. THC: Why Both Numbers Matter
This is where most of the confusion happens. THC tells you how strong the intoxicating effect is likely to be. TAC tells you how cannabinoid-rich the product is overall. A higher TAC does not necessarily mean a stronger high. It just means there are more total cannabinoids present.
Here’s a practical example. Two gummies might both contain 10 mg of THC. One has a TAC of 11 mg (almost entirely THC with traces of other cannabinoids), while the other has a TAC of 25 mg (10 mg THC plus significant amounts of CBD and minor cannabinoids). The second gummy isn’t “stronger” in the traditional sense, but it delivers a broader cannabinoid profile. If you’re comparing two products with similar THC levels, the TAC number helps you figure out which one has more going on beyond just THC.
For anyone primarily concerned with potency and psychoactive effects, the THC number is the more useful metric. TAC becomes relevant when you want a fuller picture of the product’s composition.
How TAC Appears on Labels
On gummy packaging, TAC is typically listed in milligrams, either per serving or per package (or both). For flower products, you’ll more commonly see it as a percentage. Most labels will break out THC and CBD separately with their own milligram figures, since those are the compounds consumers care about most. TAC, if included, appears as a separate total that represents all measurable cannabinoids combined.
Not every product lists TAC. It’s more common on dispensary products than on hemp-derived CBD or THC gummies sold outside dispensaries. Hemp product labels tend to highlight CBD content and delta-9 THC compliance instead. Some states, like Maryland, require labels to itemize all cannabinoid ingredients and their weights, which gives you the information to calculate TAC yourself even if the label doesn’t use that specific term.
How Labs Calculate These Numbers
Cannabis labs test for both the active and inactive (acidic) forms of each cannabinoid. In the raw plant, most THC exists as THCA, which converts to THC when heated. Because not all of the acidic form converts during that process, labs apply a conversion factor. For THC specifically, the formula is: Total THC = (THCA × 0.877) + THC. The 0.877 multiplier accounts for the molecular weight lost during conversion.
With gummies, this conversion has already happened during manufacturing, so the THC listed on the label reflects what’s actually in the product. TAC is then calculated by summing all individual cannabinoid totals. You can verify this yourself by adding up every cannabinoid listed on the lab report, often called a Certificate of Analysis or COA, that reputable brands make available.
What TAC Tells You (and What It Doesn’t)
TAC is useful as a snapshot of overall cannabinoid richness. A product with a high TAC relative to its THC content contains meaningful amounts of other cannabinoids, which some consumers prefer. Products marketed as “full spectrum” or “whole plant” typically have higher TAC-to-THC ratios because they retain more of the plant’s natural cannabinoid diversity.
What TAC won’t tell you is how a gummy will make you feel. It doesn’t account for terpenes, which influence aroma and may affect the experience. It doesn’t distinguish between cannabinoids that have very different effects. And it doesn’t reflect dosing precision or product quality. Two gummies with the same TAC could produce noticeably different experiences depending on the ratio of individual cannabinoids inside that total.
The most useful approach is to treat TAC as context, not as a standalone quality indicator. Look at the THC content first if psychoactive effects matter to you, check the CBD content if you want non-intoxicating benefits, then use TAC to understand how much additional cannabinoid content the product offers beyond those two headline numbers.