Shroom Dose Calculator
This tool provides an estimate for harm reduction purposes only. It is not medical advice. Individual results can vary significantly. Always start with a lower dose.
Enter your body weight to adjust the dosage recommendation.
Select the intensity of the experience you are aiming for.
Dosage Ranges by Effect (Dried Mushrooms)
What is a Shroom Dose Calculator?
A shroom dose calculator is a harm reduction tool designed to help individuals estimate an appropriate dosage of psilocybin-containing mushrooms. The goal is to provide a starting point for a safer and more predictable experience. It is crucial to understand that this is an estimation, not a guarantee. The potency of mushrooms varies widely, and individual sensitivity plays a huge role. This calculator should be used as part of a comprehensive approach to safety, which includes understanding your own body, the substance, and the importance of set and setting.
This tool is for adults who can legally access psilocybin and wish to make informed decisions. It is not for minors or for use in jurisdictions where psilocybin is illegal. The primary misunderstanding is treating the calculated number as an exact science. It is an informed guess designed to minimize risk.
Shroom Dose Calculator Formula and Explanation
Our calculator uses a model that combines a baseline dose for a desired effect with an adjustment for body weight. This is a common approach that balances simplicity with personalization. While direct mg of psilocybin per kg of body weight is used in clinical settings, it’s impractical for homegrown mushrooms of unknown potency.
The formula is: Final Dose (g) = Base Dose (g) × Body Weight Adjustment Factor
Variables Table
| Variable | Meaning | Unit | Typical Range |
|---|---|---|---|
| Base Dose | A standard dose in grams for an ‘average’ person (70kg) to achieve a certain effect. | Grams (dried) | 0.2g (Micro) – 4.0g (Heroic) |
| Body Weight | The user’s weight, used to adjust the dose up or down. | kg or lbs | 40kg – 150kg |
| Weight Adjustment Factor | A multiplier that scales the dose based on deviation from the 70kg average. | Unitless | ~0.7 – ~1.5 |
Practical Examples
Example 1: Standard Experience
- Inputs: Body Weight: 85kg, Desired Effect: Standard
- Calculation: The base dose for a standard trip is ~2.0g. The body weight of 85kg is higher than the 70kg average, so the adjustment factor will be greater than 1.
- Results: The calculator would suggest a dose of approximately 2.3-2.4g of dried mushrooms.
Example 2: Microdosing
- Inputs: Body Weight: 60kg, Desired Effect: Microdose
- Calculation: The base dose for a microdose is ~0.2g. The body weight is lower than average, so the adjustment factor will be less than 1.
- Results: The calculator would suggest a dose of around 0.17-0.18g of dried mushrooms.
How to Use This Shroom Dose Calculator
- Enter Your Body Weight: Input your weight and select the correct unit (kg or lbs). The calculator will convert lbs to kg automatically for the formula.
- Select Desired Effect: Choose the intensity level you are aiming for, from a non-perceptual microdose to a profound ‘heroic’ dose.
- Click ‘Calculate’: The tool will instantly provide a primary result for dried mushroom dosage.
- Review Results: The output shows the recommended dried dose, the equivalent fresh dose, and the bodyweight adjustment percentage. Use the chart to see your recommended dose in the context of other levels.
- Interpret Safely: Remember this is an estimate. For more on safety, see our magic mushroom safety guide.
Key Factors That Affect a Shroom Dose
The calculated dose is only one piece of the puzzle. Many factors influence the intensity and nature of a psychedelic experience.
- Mushroom Potency: This is the most significant variable. Potency can differ dramatically between species (e.g., *Psilocybe cubensis* vs. *Psilocybe azurescens*) and even between different batches of the same species. See our guide on types of psychedelic mushrooms.
- Fresh vs. Dried: Fresh mushrooms contain about 90% water. A common rule of thumb is that 10g of fresh mushrooms is roughly equivalent to 1g of dried mushrooms.
- Set and Setting: Your mindset (‘set’) and physical environment (‘setting’) are critical. A calm, safe, and comfortable setting can lead to a positive experience, while a chaotic one can increase the risk of anxiety. Learn more about creating the right trip setting for psilocybin.
- Individual Tolerance: If you have used psilocybin recently, you will have a temporary tolerance, requiring a higher dose to achieve the same effect.
- Empty vs. Full Stomach: Taking mushrooms on an empty stomach typically leads to a faster onset and a more intense peak.
- Medications: Some medications, particularly SSRIs, can significantly dull or alter the effects of psilocybin.
Frequently Asked Questions (FAQ)
It provides an educated estimate based on common harm reduction models. However, due to massive variations in mushroom potency, it cannot be 100% accurate. Always err on the side of caution.
A microdose (typically 0.1-0.3g dried) is sub-perceptual, meaning it shouldn’t produce noticeable psychedelic effects but may enhance mood or creativity. A standard dose (1-2.5g) will produce classic psychedelic effects.
Coined by Terence McKenna, a heroic dose is typically 5 grams or more of dried mushrooms, taken alone in silent darkness. It is intended to provoke a profound and often challenging mystical experience, including potential ego dissolution. It is not recommended for beginners. Learn about concepts like what is ego death before considering such a journey.
Yes, body weight is a factor, although its influence is debated compared to other factors like brain chemistry. Most clinical and harm reduction models incorporate it as an important variable for adjusting dose.
Typically 20-60 minutes, but it can vary. Effects can last 4-6 hours.
If you feel overwhelmed, the most important thing is to remember that the effects are temporary. Change your environment (e.g., go to a different room, change the music), focus on your breathing, and have a sober trip-sitter provide reassurance. Do not hesitate to seek medical help if needed.
It is strongly advised not to mix psilocybin with other substances, especially alcohol or prescription medications, as it can lead to unpredictable and negative interactions.
Absolutely not. This is a tool for information and harm reduction. Psilocybin can pose significant psychological risks for some individuals. Consult a medical professional, especially if you have pre-existing mental health conditions.