Tools
Harm reduction for adults, worked out in your browser. Nothing you enter is stored or sent. Every figure links to its source, and every tool is honest about what nobody knows.
Mushroom dose calculator
Dried or fresh grams for an intention level, the psilocybin it roughly equals, and the doses used in research, with why potency is the biggest unknown.
Psilocybin tolerance calculator
An approximate estimate of remaining tolerance from days since your last dose, with the research on how fast tolerance builds and fades.
Psilocybin interaction checker
Lithium, MAOIs and ayahuasca, antidepressants, stimulants, tramadol and more: the risk level, what is known and the study behind it.
Psilocybin is illegal in most places, including under US federal law. These tools do not encourage anyone to break the law, and they are not medical advice. If you take any prescribed medicine, talk to your prescriber first.
Planning ahead? Read the four-week plan, or compare retreats and licensed centres.