Marijuana equivalency ratios convert concentrates, edibles, and other infused products into a standardized flower-equivalent weight so a single purchase or possession cap can apply across every product type. The most common conversion treats one gram of concentrate as 3.5 grams of dried flower, and 100 milligrams of THC in edibles as another 3.5 grams. Under a one-ounce (roughly 28-gram) cap, that math works out to eight grams of concentrate or 800 milligrams of edible THC before you hit the ceiling.
Why the Ratios Exist
Flower typically runs 15 to 30 percent THC. A concentrate like shatter or live resin can hit 60 to 90 percent. If a possession cap were measured by gross weight alone, an ounce of 80-percent concentrate would carry four to five times the active ingredient of an ounce of flower. Equivalency ratios close that gap by translating every product back to its flower equivalent before measuring it against the limit.
The system also keeps the retail counter moving. Instead of pulling lab results for every batch, dispensary staff apply a fixed multiplier to each product category. The jurisdiction has already assigned a blanket conversion factor, so a budtender doesn’t need to know the exact THC percentage of a specific jar of wax to ring you up.
Converting Concentrates to Flower Equivalent
Under the widely used 1:3.5 ratio, one gram of concentrate equals one-eighth of an ounce of flower. If your jurisdiction caps daily purchases at one ounce, you max out at eight grams of concentrate, because 8 × 3.5 = 28. The ratio generally applies across shatter, wax, live resin, distillate, and vape cartridges, though some jurisdictions draw finer distinctions between solvent-based and solventless extracts.
Mixed carts work the same way. Buy two grams of concentrate under a 1:3.5 ratio and you’ve used seven grams of your 28-gram allowance. You still have 21 grams of headroom, so you could add up to 21 grams of actual flower in the same visit. Point-of-sale systems run this arithmetic automatically, but knowing the formula yourself prevents surprises at checkout.
Not every jurisdiction uses 3.5. Some apply a 1:4 or 1:5 ratio for certain concentrate categories, which shrinks how much you can buy. In those places, a single gram of concentrate eats four or five grams of your flower-equivalent allowance instead of 3.5. The variation is reason enough to check local rules before shopping somewhere new.
Converting Edibles and Infused Products
Edibles are measured differently because most of a chocolate bar’s weight is cocoa, sugar, and butter rather than cannabis. Counting the full product weight against your limit would be absurd, so regulators measure the total milligrams of THC inside the product.
The widely adopted standard equates 100 milligrams of THC to 3.5 grams of flower. A package of ten gummies at 10 milligrams each totals 100 milligrams, which counts as 3.5 grams against your cap. Two such packages count as seven grams. The same logic covers tinctures, beverages, capsules, and topicals; whatever the format, the active THC content drives the conversion.
Some jurisdictions use a stricter ratio. At least one treats 100 milligrams of THC as roughly 5.67 grams of flower, nearly 60 percent more restrictive than the 3.5-gram standard. A purchase that leaves you well within limits at home could put you over the line in a neighboring state that converts edibles more harshly.
How Dispensaries Enforce the Cap
Licensed retailers use seed-to-sale tracking software that logs every sale and converts each item to its flower-equivalent weight in real time. When you hand over your ID, the system pulls your purchase history for the current period. That period is usually a single calendar day, though some jurisdictions use rolling windows of 14, 30, or 35 days.
As items scan, the software adds their combined flower equivalency against your remaining allowance. If a product would push you over, the sale is blocked before it finalizes. That’s why a budtender might refuse to add a second vape cartridge even when your bag looks half-empty: the equivalency math has already used more of your allowance than the physical volume suggests. Ask where you stand mid-transaction if you’re mixing product types and want to plan the rest of your selections.
Why the Rules Vary by Jurisdiction
There is no federal equivalency standard. Every legalized state has built its own conversion table, and the differences matter. One jurisdiction might count a gram of concentrate as 3.5 grams of flower while another counts it as a straight gram-for-gram. The same product, carried across a state line, could put you at a quarter of the legal limit in one place and over it in another.
The divergence goes beyond ratios. Some states calculate limits purely by weight, so a gram of concentrate is a gram regardless of THC content. Others use potency-based formulas pegged to actual milligrams of THC, which means two concentrates of different strength can carry different flower equivalencies at identical weights. A few blend both approaches, applying weight-based rules to flower and concentrates and potency-based rules to edibles.
Purchase-window definitions add another layer. A “daily limit” might reset at midnight in one state and track on a rolling 14-day basis in another. Shopping at two dispensaries in the same day is supposed to show both the earlier purchase through the tracking system, but cross-dispensary data sharing isn’t instant everywhere. Treat each jurisdiction’s rules as a completely independent system and don’t assume your home-state math transfers.
Medical Patients Usually Get Higher Caps
In nearly every state that runs both medical and adult-use programs, cardholders can possess and purchase more than recreational consumers, with one state the known exception that sets identical caps for both groups. The size of the bump varies: some states double the recreational flower limit for medical patients, while others allow several ounces or multiple pounds of stored flower for qualifying patients. Concentrate and edible equivalencies scale with the higher flower cap, so a medical patient can also buy proportionally more of every other product type.
The higher ceiling requires an active medical card and, in some states, a physician recommendation documenting a qualifying condition. Buying at medical quantities without valid documentation carries the same penalties as exceeding the recreational cap.
What Happens If You Go Over
Penalties for exceeding a flower-equivalent cap vary enormously based on how far over you are, whether the overage looks personal or commercial, and your record. In most legalized states, a small overage of a few grams is treated as an infraction or low-level misdemeanor with a modest fine. Many jurisdictions have decriminalized small amounts entirely, making the first offense a civil fine rather than a criminal charge.
The picture changes at higher quantities. The weight threshold where possession escalates from misdemeanor to felony ranges from just over an ounce in some jurisdictions to eight pounds or more in others. A handful of states have no felony possession offense at all. In stricter states, exceeding the limit by more than an ounce or two can mean a felony charge with real prison exposure.
Equivalency ratios make these thresholds easier to trip than they look. In a jurisdiction that converts concentrate at 1:3.5 with the felony line sitting at two ounces of flower (56 grams), you reach felony territory with just 16 grams of concentrate, an amount that fits in a jacket pocket. Running the conversion before you buy is the simplest way to prevent a charge that two minutes of arithmetic would have avoided.
For licensed sellers, pushing a customer over the equivalency cap can trigger administrative fines, mandatory retraining, and license suspension. Repeated violations put the license itself at risk. Operators have every incentive to make the tracking software work correctly, but errors happen, and the customer shares responsibility for knowing their own limits.
State Compliance Does Not Equal Federal Safety
No state equivalency formula protects you from federal enforcement. Recreational marijuana remains a Schedule I controlled substance under the Controlled Substances Act, in the same category as heroin and LSD.1Office of the Law Revision Counsel. 21 USC 812 – Schedules of Controlled Substances A Department of Justice action in early 2026 moved FDA-approved marijuana products and marijuana regulated under a state medical license into Schedule III,2U.S. Department of Justice. Justice Department Places FDA-Approved Marijuana Products and Products Containing Marijuana in Schedule III with a broader rescheduling hearing set to begin June 29, 2026. Until that concludes, adult-use consumers carry the full weight of Schedule I classification.
Interstate transport is where federal law bites hardest. Carrying any amount of marijuana across a state line, even between two fully legal states, is a federal offense. For amounts under 50 kilograms, a first-time trafficking charge carries up to five years in prison and a fine of up to $250,000.3Office of the Law Revision Counsel. 21 USC 841 – Prohibited Acts A Simple possession on federal property such as national parks, military bases, or federal courthouses falls under 21 USC 844, which carries up to one year in prison and a mandatory minimum fine of $1,000 for a first offense.4Office of the Law Revision Counsel. 21 USC 844 – Penalties for Simple Possession Your state’s equivalency chart doesn’t apply in those situations.