Science-informed · Harm Reduction · Start Low
This calculator is for educational and harm reduction purposes only. It does not constitute medical advice, diagnosis, or treatment. Always consult a qualified healthcare professional before making decisions that affect your health.
Psilocybin mushrooms are a controlled substance under federal law in the United States and are illegal in most countries worldwide. Laws vary significantly by jurisdiction. You are solely responsible for understanding and complying with the laws applicable in your location.
Psilocybin has serious and potentially life-threatening interactions with certain medications and substances. Do not use if you are taking: MAOIs (monoamine oxidase inhibitors) — can dramatically amplify effects to dangerous levels; Lithium — combination carries significant seizure risk; SSRIs or SNRIs — risk of serotonin syndrome and unpredictable effect modulation; Tramadol, Linezolid, or other serotonergic drugs. This list is not exhaustive. If you take any prescription medication, consult a physician before using psilocybin.
All results are estimates based on average reported potency values. Actual psilocybin content varies significantly between individual mushrooms, flushes, growing conditions, and storage methods. Always start at the low end of any suggested range.
The creators of this tool do not encourage, promote, or condone the use of psilocybin mushrooms where prohibited by law, or use by minors. This tool exists solely to reduce harm for those who choose to use these substances regardless of legal status.