How does a cannabinoid potency chart comparison work?
A cannabinoid potency chart comparison puts lab numbers from two or more products on the same scale so you can rank them. Most charts report each cannabinoid as a percent of total sample weight, then convert that percent to milligrams per gram, per serving, or per package. The comparison holds only when both products use the same unit and the same basis (weight versus dose).
Percent tells you concentration. Milligrams tell you the dose in front of you. Mixing the two is the most common mistake in chart reading.
What do the numbers on a potency chart mean?
Percent by weight
Percent by weight is the unit used by state cannabis testing programs. A lab result of 24.6% THC means 24.6% of the sample mass is THC.
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Milligrams per gram, serving, or package
Multiply percent by 10 to get milligrams per gram, then multiply by the weight of the product you consume.
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- 1% THC = 10 mg per gram
- 10% THC = 100 mg per gram
- 20% THC = 200 mg per gram
- 30% THC = 300 mg per gram
Edible charts use a different scale. Labels show milligrams per serving and per package, not percent, because the weight of the brownie or gummy has no dosing value.
Why do potency charts show THC and THCA as two numbers?
THCA is the acidic cannabinoid found in raw plant material. It has weak psychoactive effect until heat removes a carboxyl group and converts it to THC, a process called decarboxylation.
Total THC = THC + (THCA × 0.877). The multiplier adjusts for the mass lost when the carboxyl group leaves.
A sample with 1% THC and 25% THCA works out to about 22.9% total THC, or 229 mg per gram after decarboxylation.
Typical potency ranges by product type
The ranges below reflect what shows up in most state markets. Real numbers vary by cultivar, grow conditions, and lab.
- Flower: 15% to 30% THC, 0.1% to 20% CBD depending on chemotype
- Pre-rolls: same as the flower inside, with most units at 0.5 g to 1 g
- Vape cartridges: 70% to 90% total THC
- Concentrates: 60% to 90% THC for wax, shatter, and rosin
- Edibles: 1 mg to 10 mg per serving, with many states capping packages at 100 mg
- Tinctures: 5 mg to 25 mg per milliliter
- Topicals: cannabinoid content listed by weight, with limited absorption into the bloodstream
Does convenience decide which potency number matters?
For a growing share of buyers, yes. Two products can carry the same 85% THC number and still serve different needs, because the format sets how fast the effect arrives and how long it lasts.
A potency chart ranks concentration. It seldom ranks onset, duration, or effort, and those three drive the purchase for people shopping on convenience.
Onset and duration by format
- Inhaled (vape, flower, concentrate): 1 to 10 minutes to onset, 1 to 3 hours of effect
- Sublingual tincture: 15 to 45 minutes, 4 to 6 hours
- Edibles and drinks: 30 minutes to 2 hours, 4 to 8 hours
A 5 mg dose from a vape pen and a 5 mg dose from a gummy are the same amount of THC on paper with different timing. Charts that skip timing push buyers toward the highest number, not the format that fits the moment.
Which minor cannabinoids show up on a chart?
- CBD: common in hemp and balanced flower, 10% to 20% in high-CBD cultivars
- CBG: most flower tests under 2%, higher in bred cultivars
- CBN: forms as THC degrades, so older flower and aged concentrates carry more
- CBC and THCV: minor peaks, often under 1%
- Terpenes: reported in percent or mg/g on some panels, though they are not cannabinoids
Why do two labs report different potency for the same flower?
Sampling explains much of the gap. A lab tests a few grams out of a pound, and cannabinoid content varies from bud to bud on the same plant.
Moisture, storage time, light exposure, and heat during transport all shift the THCA to THC ratio. Test methods and instrument calibration add more spread.
State programs set variance bands that let a label sit within a range of the true value. A 20% label and a 23% label can describe flower from the same harvest.
How to compare two potency charts step by step
- Match the units. Convert one chart to the other's unit before comparing.
- Check the basis. Percent by weight and mg per serving are different measures.
- Add THCA. Use total THC, not the THC line alone.
- Scale to your dose. Convert to mg for the amount you will consume.
- Factor format. Note onset and duration for each product.
- Compare price per mg. Divide total price by total milligrams of THC.
Does tolerance change how you read a potency chart?
Yes, and the chart cannot show it. A heavy concentrate user and a first-time edible user can take the same 10 mg and report different results.
Start low with any new format, note the number, and adjust from there. The chart gives you a starting point and a way to repeat a dose that worked.
Frequently asked questions
Is higher THC always stronger?
No. Dose, tolerance, delivery method, and the rest of the cannabinoid profile all shape the experience. A 0.5 g joint of 30% flower can deliver more THC than a 10 mg edible, yet the edible often feels stronger because the body converts THC into 11-hydroxy-THC.
How many milligrams is 25% flower?
About 250 mg per gram. A 0.5 g joint from that batch holds near 125 mg THC before any loss to heat.
Do potency charts include terpenes?
Some full-panel tests do. Terpenes are reported as percent or mg/g and sit outside the cannabinoid potency lines.
Are potency numbers exact?
No. They are estimates from a small sample, and state rules allow a variance band around the printed value.
What potency charts leave out
Charts measure chemistry, not experience. Convenience, onset, duration, flavor, and your own tolerance sit outside the numbers.
Use the chart to compare strength and price per milligram. Use format, timing, and dose control to pick the product that fits your day.