Shroom Calculator

An intelligent tool for estimating psilocybin mushroom dosage.

Dosage Reference Chart

This chart visualizes the typical dose ranges for different trip intensities.

General Dosage Guidelines

Trip Level	Common Name	Dried Psilocybe Cubensis (g)	Fresh Psilocybe Cubensis (g)
Micro	Sub-Perceptual	0.1 – 0.3 g	1 – 3 g
Low	Recreational	0.5 – 1.5 g	5 – 15 g
Medium	Standard Trip	1.5 – 2.5 g	15 – 25 g
High	Intense Journey	2.5 – 5.0 g	25 – 50 g
Heroic	Deep Immersion	5.0+ g	50+ g

Note: These are estimates for Psilocybe cubensis. Potency can vary significantly.

What is a Shroom Calculator?

A shroom calculator is a specialized tool designed to help individuals estimate an appropriate dosage of psilocybin-containing mushrooms (often called “magic mushrooms”). Unlike a generic calculator, it considers key variables that influence the intensity of a psychedelic experience. Its primary goal is harm reduction—providing a data-driven starting point to minimize the risk of taking an uncomfortably high dose. This shroom calculator is intended for users in regions where cultivation and consumption are legal, or for academic and research purposes. It helps translate abstract concepts like “trip level” into a tangible weight of mushrooms.

The Shroom Calculator Formula and Explanation

This calculator uses established dosage guidelines, adjusting for mushroom type (fresh or dried). While some studies suggest body weight has a minor role, we include it as a fine-tuning option, slightly scaling the dose relative to a 75kg average. The most critical factors are your desired trip intensity and whether the mushrooms are dried or fresh.

The core logic is: Recommended Dose = BaseDose * WaterContentFactor

Where `BaseDose` is determined by the selected trip level. The `WaterContentFactor` is 1 for dried mushrooms and approximately 10 for fresh mushrooms, as they are about 90% water by weight. For a more detailed guide, consider reading about a psilocybin dose guide.

Variable	Meaning	Unit	Typical Range
Body Weight	User’s body mass	kg or lbs	40 – 150 kg
Mushroom Type	The state of the mushrooms	Dried / Fresh	N/A
Trip Level	The desired intensity of the experience	Categorical	Micro to Heroic
Result	The calculated weight of mushrooms to consume	grams (g)	0.1 – 50+ g

Practical Examples

Example 1: A Beginner’s First Time

A person weighing 80 kg wants to try a low-dose experience with dried mushrooms to get a feel for the effects without a full psychedelic trip.

• Inputs: Weight: 80kg, Type: Dried, Intensity: Low
• Results: The shroom calculator would recommend a dose around 1.0 gram of dried mushrooms.

Example 2: Preparing for a Deeper Journey

An experienced user weighing 65 kg has harvested fresh mushrooms and wants a standard “medium” psychedelic experience.

• Inputs: Weight: 65kg, Type: Fresh, Intensity: Medium
• Results: The calculator would suggest a dose of approximately 20 grams of fresh mushrooms. This is much higher than a dried dose because fresh mushrooms are mostly water.

How to Use This Shroom Calculator

1. Enter Your Weight: Input your body weight and select the correct unit (kg or lbs).
2. Select Mushroom Type: This is crucial. Choose “Dried” (most common) or “Fresh”. A mistake here can lead to a 10x dosage error.
3. Choose Trip Intensity: Select the experience you are prepared for. If in doubt, always choose a lower level. You can learn more about what to expect in a safe tripping guide.
4. Review Your Results: The calculator will provide a primary recommended dose, a dosage range, and the equivalent amount for the other mushroom type. Use this as a guide, not an absolute rule.

Key Factors That Affect a Shroom Experience

The dose from a shroom calculator is only one piece of the puzzle. Many other factors can dramatically alter the intensity and quality of your experience:

• Set and Setting: Your mindset (‘set’) and physical environment (‘setting’) are paramount. A calm, safe, and comfortable space is essential.
• Individual Sensitivity: Everyone’s brain chemistry is different. Some people are naturally more or less sensitive to psilocybin.
• Mushroom Potency: Potency can vary significantly between different strains of mushrooms and even between batches of the same strain. Our calculator uses averages for Psilocybe cubensis. For specific methods, a lemon tek calculator might be relevant.
• Empty Stomach: Consuming mushrooms on an empty stomach typically leads to a faster onset and a more intense peak.
• Tolerance: If you have used psilocybin recently (within the last 7-14 days), you will have a significant tolerance, and the same dose will produce weaker effects.
• Medications: Certain medications, especially SSRIs, can blunt or alter the effects of psilocybin.

FAQ about the Shroom Calculator and Dosage

1. Is this shroom calculator 100% accurate?

No. It provides an estimate based on established harm reduction data. Mushroom potency varies greatly, and individual sensitivity is a major factor. Always err on the side of caution.

2. What species of mushroom is this calculator for?

The dosage guidelines are based on Psilocybe cubensis, the most common species of magic mushroom. Other species like Psilocybe azurescens or Panaeolus cyanescens can be significantly more potent.

3. Why is fresh vs. dried so important?

Fresh mushrooms are approximately 90% water. A 10-gram dose of fresh mushrooms contains roughly the same amount of psilocybin as a 1-gram dose of dried mushrooms. Confusing the two is a common and serious dosing error.

4. Does body weight really matter?

Scientific consensus is mixed. Unlike substances like alcohol, body mass does not seem to be a primary predictor of effect intensity. However, it is included in many calculators as a minor adjusting factor. Your brain chemistry and sensitivity are far more important.

5. How long should I wait between doses?

Psilocybin creates a rapid and short-lived tolerance. You should wait at least one week, but ideally two weeks, for your tolerance to fully reset. A microdosing schedule follows different principles.

6. What’s a “Heroic Dose”?

Coined by Terence McKenna, a heroic dose is typically 5 or more grams of dried mushrooms, taken alone in silent darkness. This is strictly for highly experienced individuals and carries significant psychological risks.

7. Can I trust the mushrooms I have?

Unless you grew them yourself or had them lab-tested, there is no way to know the exact potency. This is why the advice “start low, go slow” is critical. You can learn about different mushroom strains to understand potential variance.

8. Is this legal?

The legal status of psilocybin mushrooms varies by country and state. It is your responsibility to understand and comply with your local laws. This tool is for educational and harm reduction purposes. For more information, check a psilocybin legality map.