Cannabis Distillate Potency: How to Read the Label Before You Buy
Distillate potency is the total THC percentage by weight of the oil, and retail products in the US market land between 80 and 95 percent THC. That percentage matters less than the milligrams it converts to. A 1 gram syringe at 85 percent THC holds about 850 mg of THC, while a 0.5 gram cartridge at the same potency holds about 425 mg. Match those milligrams to your tolerance and the number becomes useful. Chasing the highest percentage on the shelf does not improve the experience and often costs more per milligram of THC.
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What the potency number means
Total THC is delta-9 THC plus THCa multiplied by 0.877. Distillation heats the oil enough to convert most THCa into THC, so on a distillate certificate of analysis the total THC and delta-9 THC values sit close together. A wide gap between them suggests the oil is not true distillate or the lab report covers a different product. Percentages are weight based: 1 gram at 90 percent THC equals 900 mg of THC, and 0.5 gram at 90 percent equals 450 mg.
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Minor cannabinoids such as CBD, CBG, CBN, and CBC appear in distillate at low single-digit percentages. Some producers blend them back in, and those blends trade a small amount of THC percentage for a broader cannabinoid profile.
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What to look for on a distillate label
- Batch specific lab report from a licensed testing lab, matched to the batch number on the package
- Total THC, delta-9 THC, and THCa listed as separate values
- Terpene content stated as a percentage, since added terpenes reduce THC percentage
- Test date and harvest or production date
- THC per package for edibles, and THC per gram or per cartridge for inhalable oil
- State required warnings and a license number you can verify
Potency bands and what they tell you
- 60 to 75 percent THC: common in oils that keep a wider cannabinoid range or carry a heavier terpene load. Flavor reads stronger.
- 75 to 85 percent THC: the usual range for vape cartridges with reintroduced terpenes.
- 85 to 95 percent THC: standard high purity distillate. Little flavor of its own, so producers add terpenes for taste.
- Above 95 percent THC: possible, though single cannabinoid figures, peak values, and normal lab variance explain many of these claims. Read the full report.
Edible dosing follows a separate rule. Many states cap servings at 10 mg of THC and packages at 100 mg, and that cap applies whether the input was distillate or another extract.
Common pitfalls
- Comparing a THCa number against a total THC number. They are not the same measurement.
- Buying from an unlicensed seller with no batch lab report. Potency claims without testing are guesses.
- Assuming distillate hits harder than flower. The effect from a narrow cannabinoid profile can feel flat to some users.
- Ignoring dose. 5 mg and 50 mg of THC are different experiences regardless of the percentage on the jar.
- Storing oil in heat or direct light. THC degrades into CBN over time, which shifts the effect toward sedation.
- Paying a premium for the last few percentage points. Cost per milligram of THC is the number that matters.
Frequently asked questions
Is higher potency distillate better?
No. Potency sets dose, not quality. A clean 82 percent distillate with a verified lab report beats a 94 percent product with no batch data.
How do I calculate milligrams of THC in a distillate cart?
Multiply the weight in grams by 1000, then multiply by the THC percentage as a decimal. A 0.5 gram cart at 88 percent THC gives 0.5 x 1000 x 0.88, or 440 mg of THC.
Why does a label show 99 percent THC?
Some reports list a single cannabinoid or a peak value rather than total THC. Others leave terpenes out of the calculation. Check the full certificate of analysis before you treat the number as total potency.
Does distillate potency drop over time?
Yes, with age. Heat, light, and air convert THC into CBN. Store cartridges and syringes in a cool, dark place and use them within the timeframe the producer states.
Cannabis laws and purchase limits vary by state. Buy only from licensed retailers in jurisdictions where adult use or medical use is legal, and keep products away from minors and pets.