The bottle price gets all the attention, and it is the least useful number on the label. What you want is cost per milligram of THC and cost per serving you will actually take. Two bottles can sit side by side, one at $18 and one at $34, and the cheaper one can lose once you divide.
Run the two-number check before you buy
Total THC in the package equals gummies times milligrams per gummy. Cost per mg is the bottle price divided by that total. Cost per serving is the bottle price divided by the number of pieces, adjusted if you cut them in half.
cannabis gummies dosage calculator
Example: 20 gummies at 5 mg is 100 mg total. At $30 that works out to 30 cents per mg and $1.50 per piece. A 10-pack of 10 mg gummies also holds 100 mg. At $45 it is 45 cents per mg and $4.50 per piece. Same total potency, half the value.
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What moves the number up or down
- Piece count and potency. Bigger bottles with more mg per piece almost always lower your cost per mg. That is the main lever.
- Extract type. Distillate gummies are cheap to produce. Live resin, rosin, and full-spectrum options carry a premium you may or may not taste.
- Format. Single-serve packs and 2-packs charge a convenience fee, often two to three times the per-mg cost of a 20-count bottle.
- State taxes and license type. The same brand prices differently across state lines once excise tax and dispensary margin land.
- CBD content. A 1:1 gummy with 5 mg THC and 5 mg CBD is priced partly on the CBD, so per-mg THC math understates what you get.
Pitfalls I watch for
Labels that lead with total package THC but bury the per-piece dose. A "1000 mg" bottle can mean 100 pieces at 10 mg or 10 pieces at 100 mg, and those are not the same product. Check the mg per gummy every time.
Convenience markup is the quiet one. If you eat a gummy a few nights a week, a 20-count bottle at a lower per-mg rate beats a 5-pack, provided you store it well and finish it before it goes stale. If you use once a month, the small pack costs less overall even at a worse unit price, because the rest of the bottle may dry out or lose potency.
Hemp-derived and gray-market gummies sometimes skip lab testing, so the stated mg is a guess. Licensed products post batch results, and a certificate of analysis is worth asking for at the counter.
Then there is dosing. Oral cannabis usually takes 30 to 120 minutes to hit, so buy a bottle that lets you take 2.5 to 5 mg without splitting a piece into crumbs. A slightly higher unit price on scored, low-dose gummies is often the better buy.