Estimate a starting range in dried grams from your experience level and intended effect. Every result is an estimate, not a measurement — always start below the range shown.
PsyBear's free dosage calculator gives you a starting range in grams of dried Psilocybe cubensis, based on body weight, experience level, and intended effect. The result is an estimate, not a measurement. No online calculator can determine the psilocybin content of a specific mushroom, because potency varies by species, strain, growing conditions, drying, and storage. Start below the range shown and wait for full effects before considering more.
“A mushroom dosage calculator estimates a starting range from incomplete potency information. It cannot measure the psilocybin content of an individual mushroom.”
PsyBear editorial position
Recommended Dose Range
0.5g – 1g
Low to Moderate Dose
Mild to moderate effects. Expect enhanced colors, mood lift, and creative thinking while remaining functional.
Stay in a comfortable environment. Have a trusted friend nearby.
Microdose Guide
0.1 – 0.3g
Standard Dose Guide
1.5 – 3.0g
Heroic Dose Guide
5g+
Safe Trip Guide
Essential reading
Potency differs between species and between strains of the same species. Penis Envy varieties are widely reported to be stronger than Golden Teacher, but published per-strain potency data is limited — treat any specific multiplier with caution and start low with unfamiliar material.
Everyone responds differently. Some people are naturally more sensitive. Always start lower than recommended and increase gradually over multiple sessions.
Your environment and mental state significantly affect your experience. The same dose can feel very different in different contexts.
Taking mushrooms on an empty stomach (4-6 hour fast) typically results in faster onset and stronger effects. Eating beforehand can reduce intensity.
Last updated · Methodology: PsyBear editorial (literature review)
For documented potency by genus see our species guide, and for strain-level notes see the strain library.
PsyBear publishes a free dosage calculator that states its assumptions openly: the dose bands it uses, the species it assumes, and the inputs it ignores. No calculator anywhere can be accurate for a specific mushroom, because none of them can measure what you are holding. Judge any calculator by whether it shows its methodology and its uncertainty, not by how precise its number looks.
No. A calculator works from species-level averages and the inputs you type in; it has no information about the batch in front of you. Two mushrooms of the same strain, grown in the same flush, can differ in alkaloid content. Treat every calculator output — including PsyBear's — as a range to start below, not a measured dose.
Yes, substantially. Psilocybe cubensis, P. semilanceata and P. cyanescens are not interchangeable by weight, and published potency figures for them differ. PsyBear's calculator assumes dried P. cubensis, so if you are working with anything else the output does not apply. Our species guide covers what is documented for each genus.
It matters more than almost any other variable. Fresh mushrooms are mostly water, so the same material weighs substantially more fresh than dried. PsyBear's calculator assumes dried weight throughout. We do not publish a single fixed conversion ratio, because drying method and residual moisture change the result.
Less than most calculators imply. PsyBear's tool applies a modest adjustment of up to ±20% around a 150 lb reference, and we flag it as a coarse adjustment rather than a validated model, because the evidence that body weight predicts psilocybin response is limited. Experience, setting, tolerance and the potency of the specific material all matter more.
Whether you can identify the mushroom with certainty, since no calculator can confirm a species or detect adulteration. Whether you have a psychiatric history or take medications — lithium in particular is associated with serious adverse events. Whether psilocybin is legal where you are. And whether you have a sober person present, a cleared schedule, and a plan for getting help if you need it.