Quick answer
There is no universal serving size for weed concentrates. Potency swings from about 60% to 90% THC depending on the product, and a single dab can hold more THC than an entire 10 mg edible. A sensible starting serving is 1 to 2 mg of THC if you inhale it, and 2.5 to 5 mg if you eat or drink it. A rice-grain dab, roughly 25 mg of concentrate, often lands between 15 and 30 mg of THC.
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Most legal states standardize edibles at 10 mg THC per serving and 100 mg per package. Concentrates do not work that way. They are sold by weight, with a potency percentage on the label, and the buyer decides how much goes into the rig, pen, or spoon.
Why concentrates need their own dosing math
Flower tests between 15% and 25% THC. Concentrates strip away plant material, so the same weight carries three to five times more cannabinoids. A dose measured by eye is unreliable at that strength.
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- Wax, shatter, budder, and rosin: often 60% to 85% THC
- Live resin and live rosin: often 65% to 90%
- Distillate: often 80% to 95%
- RSO and full-extract oils: often 60% to 80%
How to calculate a serving
The math is short. Take the weight of the concentrate in grams, multiply by 1000 to get milligrams, then multiply by the THC percentage.
How to Find Cannabis Concentrate Dosage Information
Example: 0.05 g of shatter at 80% THC. That is 50 mg of concentrate times 0.80, which equals 40 mg of THC. Split that into four dabs and each one is about 10 mg.
I run this formula before I load anything. It turns a fuzzy label into a number I can compare against a dose I already know.
Starting servings by method
Dabbing
A grain of rice is the classic reference point, but it is a rough one. That grain weighs about 20 to 30 mg. At 70% THC, one dab is 14 to 21 mg. New users should aim for a quarter of that, closer to 3 to 5 mg. A milligram scale costs less than a gram of rosin and removes the guesswork.
Vape cartridges
You cannot weigh a puff. A three-second draw from an 85% cartridge delivers 1 to 3 mg of THC, depending on the battery, the airflow, and how hard you pull. Count your draws and wait 10 to 15 minutes before adding another. Two puffs is a reasonable first test for most people.
Oral concentrates
RSO, distillate syringes, and tinctures are eaten or held under the tongue. Start at 2.5 mg THC. Oral cannabis takes 30 to 120 minutes to show up, and the peak can arrive two to three hours in. A common mistake is taking another dose at the 45-minute mark because nothing has happened yet.
Timing and redosing
- Inhaled: effects start in seconds to a few minutes and peak around 10 to 15 minutes. Wait at least 15 minutes before a second hit.
- Oral: onset is 30 to 120 minutes, peak at two to three hours. Wait two full hours before deciding to redose.
Redosing too early is the most common way people end up uncomfortably high. The high from a dab does not keep climbing after the first few minutes, so another hit mostly adds intensity, not duration.
Practical tips
- Buy a 0.001 g scale if you dab at home.
- Keep a note on your phone: product, THC percentage, weight, and how it felt.
- Start low on a day when you have nothing else scheduled.
- Store concentrates in a locked box, away from kids and pets.
- Do not drive after any dose you have not used before.
Bottom line
Treat 1 to 2 mg of inhaled THC or 2.5 to 5 mg of oral THC as your starting serving, do the potency math before you load, and wait the full onset window before redosing. Concentrates reward patience more than they reward a big scoop.