Home » All Calculators » Fitness and Health » Shroom Tolerance Calculator

Shroom Tolerance Calculator

Photo of author
Published on

Psychedelic mushrooms, commonly known as shrooms, have been used both recreationally and medicinally for centuries. However, like many substances, users can develop a tolerance to psilocybin, the active compound in shrooms. This is where the Shroom Tolerance Calculator comes into play. Designed to help users understand how tolerance to psilocybin builds up over time, this calculator provides a scientific yet simple way to estimate the dosage required to achieve similar effects as previous experiences, taking into account the user's tolerance level.

Purpose and Functionality

The primary purpose of the Shroom Tolerance Calculator is to estimate the new dosage of shrooms required to achieve effects similar to a previous dose, considering the time that has elapsed since that last dose. This tool is particularly useful for those looking to maintain responsible use practices, ensuring that individuals can understand their tolerance levels and adjust their intake accordingly.

The calculator operates on a straightforward formula:

D_new = D_previous * (1 + T / H)


  • D_new is the new dosage required to achieve similar effects.
  • D_previous is the previous dosage taken.
  • T is the number of days since the last dose.
  • H is the tolerance half-life, estimated at around 14 days for psilocybin.

Step-by-Step Example

Let's walk through an example calculation:

Suppose you took 2 grams of shrooms and are planning to take them again 3 days later. To calculate the new dosage required to achieve similar effects, considering your tolerance:

  1. D_previous: 2 grams (the amount you took last time)
  2. T: 3 days (days since your last dose)
  3. H: 14 days (the estimated tolerance half-life for psilocybin)

Using the formula, the calculation would be:

D_new = 2 * (1 + 3 / 14) = 2.214 grams

Thus, you'd need approximately 2.214 grams to achieve effects similar to your last 2-gram dose.

Relevant Information Table

Here's a table that provides a quick reference for different scenarios based on the formula:

Days Since Last DosePrevious Dosage (grams)New Dosage Required (grams)

This table demonstrates how the required dosage increases with the number of days since the last dose, reflecting the decrease in tolerance over time.


The Shroom Tolerance Calculator is a valuable tool for anyone looking to understand and manage their psilocybin tolerance levels. By providing a scientific basis for dosage calculations, it encourages safer and more informed use of shrooms. Whether you're a first-time user or an experienced psychonaut, this calculator can help you tailor your psychedelic experiences to your personal tolerance levels, ensuring that each experience is as rewarding and safe as possible. Remember, this calculator provides estimates based on general assumptions and should not be taken as medical advice. Always approach psychedelic use with caution and respect for the substance.

Leave a Comment