Hi everyone! I hope you all have been having an awesome day/night :).

After noticing that there was no currently available tolerance calculator for psychedelics, I went ahead and made one! The calculator should provide the best possible estimate for tolerance to any common psychedelic.

Important Note: As pointed out by /u/borax this calculator/formula is only applicable to LSD, psilocybin, and the tryptamines. Further, it is able to handle all dosage formats (115, 3.5, 12) due to its nature. However, this does not make the formula safe for predicting tolerance for psilocybin mushrooms due to the great amount of variance of psilocybin per dose. This formula is as close as I could get to a good model for psychedelic tolerance, it's not perfect though. Tolerance varies greatly from individual to individual and relies on many very subjective variables. Lastly, never take a dose that you're uncomfortable with in the hopes of overcoming tolerance. Thank you all for reading this extra little bit, be safe :).

The calculator is currently implemented in and working with excel, it can be downloaded here.

Update: /u/EmbracingChange has made a web application for the calculator! It can be found here! This means that the calculator can now be easily used on nearly any device anywhere! :)

If you'd rather just use the formula instead, here you go!

y= x/100*280.059565*n^-0.412565956

The y value represents dosage needed for same effect, the x value represents last dosage taken, the n value represents the number of days since last trip.

For those interested, the formula was devised by digitizing the data points in the commonly referenced psychedelic tolerance graph. Once I had the exact data points, I performed power regression to find the base formula. After that, all I needed to do was adapt the base formula to have an input for dosage and it was all done!

I truly hope this calculator helps :)

Thank you all so much for being such an awesome community.

Edit: I've included the digitized data set here!

Edit 2: Added important note.

Edit 3: Added update.

Edit 4: Updated links.

With love,