An ounce of shrooms is 28.35 grams of dried mushrooms and, at an assumed 1% psilocybin by weight, holds roughly 11 standard 2.5-gram portions of about 25 mg each. That's an estimate rather than a guaranteed dose, because the active compound isn't spread evenly through every mushroom.
That gap between weight and strength is where many users get tripped up. A scale tells you mass. It doesn't tell you milligrams of psilocybin, and two equal-looking pieces of fruiting body can expose you to very different amounts. Research summarized by Washington State's Liquor and Cannabis Board indicates therapeutic effects are commonly associated with approximately 20 to 30 mg of psilocybin, largely independent of body weight, not with a fixed mushroom mass.
Read an ounce as bulk inventory, not as a single experience and not as a promise of consistency. Once you separate grams of material from milligrams of psilocybin, the price, storage, legal and safety questions below get much easier to judge.
How Many Doses Are in an Ounce
An ounce of shrooms weighs 28.35 grams, but that weight alone doesn't settle how many doses you have. The missing number is potency, and potency isn't printed on the bag unless the batch has been tested.
A clinical dosing review estimates dried Psilocybe cubensis contains approximately 0.5% to 2% psilocybin by weight, with about 1% used as an average working estimate. At that midpoint, 28.35 grams would contain roughly 283.5 milligrams of psilocybin, while the reported range puts the same ounce at about 141.75 to 567 milligrams.
The Arithmetic Behind the Estimate
Do the division once and the scale of an ounce becomes clear. 28.35 g divided by 2.5 g gives about 11.3 portions. Divided by 3.5 g, it gives about 8 portions.
Those portion sizes come from the same review's equivalence table. It places a standard 25-milligram psilocybin dose at approximately 2.5 grams of dried P. cubensis, a high 35-milligram dose at about 3.5 grams, and a 50 to 60-milligram dose at roughly 5 to 6 grams, all assuming 1% concentration.
| Target psilocybin | Dried mushrooms needed | Portions per ounce |
|---|---|---|
| Therapeutic reference range, 20-30 mg | 2-3 g | about 9-14 |
| Standard clinical dose, 25 mg | 2.5 g | about 11 |
| Higher dose, 35 mg | 3.5 g | about 8 |
| High dose, 50-60 mg | 5-6 g | about 5 |
Use the table as a conversion, not a prediction. It answers, "If this material were exactly 1%, how would the math look?" It can't answer what a particular bag will do.
Why Equal Weights Don't Mean Equal Exposure
Measured samples show why you shouldn't treat the 1% figure as a property of every mushroom. A controlled analytical study reported a mean psilocybin concentration of 1.14% plus or minus 0.17% by weight, with total psilocybin plus psilocin concentrations from 0.85% to 1.45% by weight across strains. That narrower published range still implies approximately 241 to 411 mg per ounce before you account for individual mushroom variation.
Strain-level differences widen the picture. Research on 14 cultivated P. cubensis strains found total tryptamine concentrations varying more than 7.8-fold, from 2.62 to 20.65 mg/g, while individual fruiting bodies within strains showed psilocybin coefficients of variation of approximately 12.81% to 23.39%.
A larger quantity holds more psilocybin on average, but that doesn't make two portions cut by weight interchangeable.
Say you cut two 2.5-gram portions from the same ounce. One leans on a potent cap, the other on weaker stems and smaller fruits. Both weigh the same on your scale. They don't necessarily deliver the same exposure, because chemistry varies by species, strain, cultivation conditions, storage and the individual mushroom itself.
Mixed products add another layer. In a chocolate or drink, a stated amount may refer to total mushroom material rather than measured psilocybin. You can't read that number against the dried-mushroom table unless the label reports tested milligrams per serving.
What Would Make the Number Reliable
Only testing turns a working estimate into a batch-specific figure. For solid quality control, you homogenize a representative sample so potent and weak pieces are mixed evenly, then test it with a validated method such as LC-MS/MS or HPLC. The result gives you milligrams per gram for that batch, which you can multiply by a weighed portion.
Without that step, treat any per-portion milligram claim as provisional. Strain names like Penis Envy or Enigma, blue bruising and cap size don't establish potency. If you want the practical side of portioning in more detail, work through plain guidance on dosing magic mushrooms by weight and milligrams and keep the 1% assumption visible in every calculation you make.
What an Ounce Typically Costs and Why Prices Differ
Start with the most recent broad figure. A 2026 guide from California Prime Recovery lists an average one-ounce price of $200 for psilocybin mushrooms and gives the broader range as $200 to $400.
Other published figures sit lower, which tells you more about compilation method, date and variety than about a single national price.
| Source and year | Price per ounce | Basis or note |
|---|---|---|
| The Fun Guys price chart, 2024 | $99 common, $300 rarer varieties | 1-ounce (28-gram) chart price by variety type |
| AddictionResource.net estimate, 2025 | $125 to $188 | Derived from $2,000 to $3,000 per pound |
| California Prime Recovery guide, 2026 | $200 average, $200 to $400 range | Broad market average for one ounce |
Converting Price Into Terms You Can Compare
Per-gram math exposes how wide the spread is. $99 for 28.35 grams is about $3.50 per gram. At $200, the same ounce is about $7.05 per gram, and spread over roughly 11 standard 2.5-gram portions it's about $18 per portion under the 1% working assumption.
Don't let that per-portion figure fool you into thinking you're paying for a fixed 25 mg. You're paying for grams of dried material. If one batch tests weaker than another, your cost per actual milligram rises even though the ounce price stayed the same.
Variety and rarity move prices because sellers price names and scarcity. Region and date matter because supply, enforcement risk and legality differ by market. Testing and packaging can add cost when a seller pays for lab work, child-resistant containers and clear labeling.
Practical rule: Compare prices per ounce only after you know the batch's tested potency. A cheap untested ounce and a pricier tested ounce aren't the same product.
A higher price doesn't guarantee a stronger or more consistent product. It may reflect a rarer variety name, a processed format such as a chocolate bar or drink, or simple scarcity. Ask for the price per gram, the batch date and any lab result, then decide whether you're paying for information and consistency or only for a name.
Storing an Ounce Without Losing Quality
An ounce is a lot of material to keep in good condition, and dried mushrooms lose quality through three predictable routes. Moisture encourages mold. Heat and light degrade active compounds over time. Good storage blocks all three.
Keep mushrooms fully dry in an airtight container, such as a glass jar with a tight seal or a heavy foil bag. Store it in a cool, dark cupboard away from ovens, radiators and sunny windows. A food-safe silica desiccant pack inside the container helps control humidity.
Rules That Prevent Most Storage Problems
- Don't seal damp material: Vacuum sealing is only sensible once the mushrooms are fully dry, because trapped moisture then has nowhere to go.
- Avoid temperature swings: Moving containers between warm and cold conditions creates condensation on the inside, which wets material that was dry.
- Label every container: Write the batch, source and date on the outside, and keep different batches in separate containers so you don't mix unknown chemistry.
- Weigh it periodically: A rising weight suggests moisture gain. Inspect for softness, off smells or visible mold, and don't try to rescue moldy material by trimming it.
- Limit opening: Each opening lets humid room air in. Split an ounce into smaller sealed containers if you'll access it over time, so most of it stays closed.
Safety belongs in the same routine. Store mushrooms and any edibles out of reach of children and pets, in child-resistant packaging where you can. Chocolates and drinks look like ordinary food to a child, so keep them separated from pantry snacks, clearly labeled.
Published data on potency loss over time are limited, so don't assume old material has kept its original strength. Treat stored mushrooms as variable rather than fixed, especially after poor storage. For container choices and drying checks in more detail, see practical guidance on the best way to store shrooms.
Legal Status of an Ounce Where You Live
Federal law is the baseline, whatever your city has decided. The American Bar Association's account of rescheduling psilocybin notes the Controlled Substances Act was enacted in 1970 and psilocybin was placed in Schedule I, making possession, manufacture, distribution and dispensing unlawful under federal law.
That schedule is reserved for substances defined federally as having high abuse potential, no currently accepted medical use and insufficient accepted safety under medical supervision. Schedule I status also constrained scientific research for decades.
State and Local Layers in Michigan
In Michigan, possession and use remain illegal under state law, and commercial sale or distribution isn't permitted. Local reforms change enforcement, not that underlying status.
Ann Arbor's City Council voted in September 2020 to make enforcement against psilocybin its lowest policing priority. That's decriminalization in practice, not legalization. Detroit voters approved Proposal E in November 2021, decriminalizing personal possession and therapeutic use in the city.
An ounce of shrooms in your home in Ann Arbor therefore sits in a different practical position from the same ounce a short drive away. Local priority policies also don't bind state or federal officers, and they don't authorize a retail market. Read current guidance on magic mushrooms in Michigan against your own municipality before you assume a local headline covers you.
Other Models and the Border Problem
Elsewhere, structures differ sharply. Oregon voters approved Measure 109 in November 2020, and Oregon's regulated model limits legal consumption to licensed service centers with facilitators, production standards and mandatory purity and potency testing. Colorado permits certain adult personal possession without remuneration.
A state-by-state summary of psilocybin mushroom laws underlines that consequences depend on jurisdiction, classification and whether possession, sale, transport or facilitated use is involved. For visitors from Ohio, Illinois and Indiana, crossing a state line with an ounce can create separate legal exposure even where Michigan local enforcement is lower.
Possession, sale and transport aren't the same act under the law. Treat each as a separate question.
Don't rely on a search result that presents "one ounce" as a universal threshold. Amount, product form and intent can all matter. Check current rules for your city and state on the day you make a decision, because enforcement policies and legislation change, and an old summary won't protect you.
Safety Limits and What to Do in an Emergency
The infographic below sets out the main risks and the point at which you should stop monitoring and seek help.
Serious reactions are uncommon in controlled settings, but that doesn't make a large quantity low-risk. Anxiety, nausea, dizziness, blood-pressure changes and behavioral emergencies can occur, and an ounce contains many times a typical research-dose equivalent. A calmer way to think about risk is that more material raises the chance of an intense, disorienting experience, especially when potency is unknown.
Edibles carry a distinct problem. U.S. investigations of mushroom-containing edibles identified undisclosed substances and severe illnesses including seizures, loss of consciousness and respiratory failure, according to research on cultivated P. cubensis potency and edible risks. A chocolate or drink that claims a serving size may not contain what the label implies, so treat unfamiliar products with more caution, not less.
Use extra caution with alcohol, cannabis, other drugs and some prescription medications. Combinations can intensify impairment or anxiety and make symptoms harder to interpret. If you take regular medication, check interactions with a pharmacist rather than guessing.
The video below offers a useful refresher on recognizing when a difficult experience has become a medical problem.
If Someone Becomes Unwell
- Stay with the person: Move them to a quiet, safe space and don't leave them alone.
- Call 911 without waiting: Do this for chest pain, trouble breathing, seizure, fainting or inability to wake.
- Call Poison Control at 1-800-222-1222: Use it for guidance when symptoms are concerning but not immediately life-threatening.
- Prevent further harm: Don't let the person drive, and don't give other drugs or alcohol to calm them.
- Record the facts: Note what was taken, how much and when, plus any medication or other substances involved.
Panic alone usually calls for calm supervision. Breathing trouble, seizure or unresponsiveness calls for 911.
A quiet environment and a sober person who can stay present lower the chance of a harmful episode. They don't remove risk, and they never substitute for medical help when physical warning signs appear.
Confirm Lab Results and Legality Before You Buy
Before you buy or possess an ounce of shrooms, verify what the weight can't tell you. Work through this checklist and stop if you can't answer an item.
- Lab certificate in milligrams: Ask for psilocybin content in milligrams per gram or per unit for that batch. A strain name, a photo or a claim about strength isn't a substitute.
- Batch date and method: Look for when the material was produced or tested and which method was used, such as LC-MS/MS or HPLC. Undated results can't be tied to the product in front of you.
- Packaging and storage guidance: Expect child-resistant packaging and plain storage instructions. Edibles need serving information that's tied to tested content, not only to total mushroom material.
- Price per ounce and per gram: Get both figures so you can compare like for like. Don't decide on price until potency information is clear, because cost per gram says nothing about cost per milligram.
- Legality where you are and where you're going: Confirm possession or purchase is lawful in your city, your state and any state you plan to travel through. Don't infer permission from a neighboring city's enforcement policy.
- A plan for a bad reaction: Save the Poison Control number, decide who can stay with you, and agree in advance which symptoms mean calling 911.
Questions Worth Asking Any Seller
Ask for batch-level lab results directly. If the seller can't produce them, can they at least state the batch date, the product form and how a serving was measured? If the answer is vague, treat every strength claim on the package as marketing.
Also ask how the product was stored and whether different batches were mixed. Mixing complicates testing, because one sample no longer represents the whole container. Homogenized, tested material gives you a defensible number. A mixed bag of whole mushrooms gives you a range, and you should plan around the strong end of it.
An ounce tells you how much material you have. Testing tells you what's in it, and a legal check tells you whether you may have it at all. Keep those three questions separate and you won't mistake a scale reading for a dose.
Metro Mush serves adult customers across the Detroit and Ann Arbor metro areas with dried mushroom strains, chocolate bars and drinks, plus clear menu pricing and regular specials you can compare before you order. Browse the current selection and check what fits your questions about potency, format and value at Metro Mush.
