A unit for cannabis.
Enter flower, concentrates, edibles or oils with their strength, and THC Units shows the amount in standard units and milligrams, plus the share of the weekly guideline.
← All work
THC Units: Cannabis, counted like standard drinks.
A free calculator that turns any cannabis product into standard THC units, so people can see how much they actually use.
1 unit = 5 mg THCRuns in the browserNo personal data
Grams lie.
Potency varies so widely that a gram tells you very little. Alcohol has standard drinks; cannabis had nothing comparable until researchers at the University of Bath proposed 1 unit = 5 mg of THC (Addiction, 2026).
Three taps to a number.
- Pick the product type and enter the amount and strength.
- See your units and the "if you used this much" projection.
- Keep a private weekly log against the 8 units a week guideline.
A shared language.
Once there is a common unit, people, doctors and public-health campaigns can talk about the same thing. Your log stays in your own browser, so honesty costs nothing.
From guessing to knowing.
Harm reduction starts with knowing your number. THC Units puts the research into a tool anyone can use in a minute.