A cannabis gummies dosage calculator turns two label numbers into one dose. Divide total THC milligrams in the package by the number of servings. That gives milligrams per gummy. Then divide your target dose by milligrams per gummy to get the number of pieces to eat.
The formula
- THC per serving = total package THC (mg) / servings per package
- Pieces to eat = target dose (mg) / THC per serving (mg)
Example: a package holds 100 mg THC and 10 gummies. Each gummy is 10 mg. A 5 mg target dose is half a gummy. A 2.5 mg target dose is a quarter gummy.
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Inputs the calculator needs
- Total THC in milligrams, taken from the package label. Use THC, not CBD, not total cannabinoids.
- Servings per package. Count the pieces if the label is vague.
- Target dose in milligrams.
Target doses
- 2.5 mg: common starting dose for a new user.
- 5 mg: low dose for a user with some tolerance.
- 10 mg: the standard single serving in states with legal retail sales, such as California and Colorado.
- Above 10 mg: for users with established tolerance. Side effect risk rises with dose.
Why label math is a starting point
State testing rules differ. A label states a tested batch value, not the amount that reaches your blood. Edible THC passes through the liver and converts to 11-hydroxy-THC, a compound with stronger effects. Onset runs 30 to 120 minutes. Peak effects arrive at 2 to 4 hours. Effects can last 6 to 8 hours.
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Rules that prevent a bad night
- Wait 2 hours after a dose before eating more.
- Do not stack a second edible because "nothing happened" at 45 minutes.
- Keep the package. The label is the record of milligrams per piece.
- Skip weight-based math. No accepted mg-per-kilogram formula exists for THC edibles.
Limits: a calculator cannot account for tolerance, liver enzyme activity, other drugs, or an inaccurate label. Treat the output as an estimate.