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Mushroom Dosage Calculator

Dosage scales with body weight. Enter yours to see estimated ranges — from sub-perceptual microdoses through higher doses — in grams and milligrams.

Results update as you type. Nothing is submitted, saved, or sent anywhere.

Before you use these numbers

  • Start lower than the calculator says. Individual sensitivity varies enormously — far more than body weight alone predicts. A first dose should be the smallest amount that might do anything, not the amount that should work.
  • Potency differs between strains and batches. Albino Penis Envy and Enigma are considerably stronger by weight than Golden Teacher, so the same gram figure is not the same experience.
  • Medication interactions are real. SSRIs and other antidepressants can blunt effects; MAOIs and lithium can be dangerous in combination. Speak with a healthcare professional first if you take prescription medication.
  • Some people should not use psilocybin at all. A personal or family history of schizophrenia, psychosis, or bipolar disorder is a genuine contraindication.
  • Tolerance builds fast. Taking a dose within a few days of the last requires substantially more for the same effect — which is why microdosing protocols include days off.

This calculator provides general estimates for informational purposes only. It is not medical advice, and it has not been evaluated by the FDA. If you are struggling with mental health or substance use, the SAMHSA National Helpline is free and confidential at 1-800-662-4357.

Read the Microdosing Guide