Last Updated: August 19, 2026. Cannabis laws, package sizes, menus, and prices can change. The weight conversions in this guide are stable, but always check the current product label and New Mexico rules before buying.
How many grams are in an ounce of weed? 28 grams is the number you will usually see at a dispensary. Cannabis math looks harder than it is because it mixes grams with fractions of an ounce. Basically, the metric system and the imperial system got stuck in the same group project, and cannabis shoppers inherited the homework.
The good news is that there are only a few numbers worth remembering. This guide breaks them down, explains what an eighth actually means, covers common slang like “zip,” and shows how New Mexico labels and purchase limits fit into the math.
Cannabis Measurements Cheat Sheet
One dispensary ounce is usually treated as 28 grams. Here is the same ounce broken into the package sizes you see most often.
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This visual shows the weight relationship, not the physical size of the flower. Dense buds and fluffy buds can look very different while weighing exactly the same.
| Common name | Grams | Ounce fraction | Common slang |
|---|---|---|---|
| Gram | 1 g | About 0.035 oz | Gram |
| Eighth | 3.5 g | 1/8 oz | Eighth, sometimes “slice” |
| Quarter | 7 g | 1/4 oz | Quarter, sometimes “quad” |
| Half ounce | 14 g | 1/2 oz | Half, half-O |
| Ounce | 28 g at most dispensaries | 1 oz | Ounce, “O,” or “zip” |
Why Is an Ounce of Weed 28 Grams Instead of 28.35?
The math and the dispensary shorthand are slightly different. The National Institute of Standards and Technology lists one U.S. ounce as approximately 28.35 grams.
On cannabis menus, though, you will usually see a full ounce treated as 28 grams. That cleaner number is what makes the familiar retail sizes work: 3.5 grams for an eighth, 7 grams for a quarter, and 14 grams for a half ounce.
So the useful dispensary answer is 28 grams. The exact ounce-to-gram conversion is about 28.35 grams. Tiny difference, big opportunity for the internet to argue about decimals.
What Is an Eighth of Weed?
An eighth of weed is 3.5 grams. The name comes from the fraction: it is one-eighth of a 28-gram dispensary ounce.
28 grams ÷ 8 = 3.5 grams
That is all an eighth is. No secret cannabis algebra. The fraction just showed up wearing a cool nickname.
Eighths show up often on dispensary menus because 3.5 grams is a common package size. If the mix of weights, labels, formats, and product names feels like a lot, Bud Board’s beginner cannabis guide for New Mexico covers the bigger picture.
How Many Grams Are in a Quarter, Half Ounce, and Full Ounce?
Once you know that an ounce is treated as 28 grams, the rest is simple division:
- Quarter ounce: 7 grams
- Half ounce: 14 grams
- Full ounce: 28 grams
You can also work backward. Two eighths make a quarter. Two quarters make a half. Two halves make an ounce. Eight eighths make a full ounce, which sounds like the kind of math problem teachers use when they run out of apples.
What Does a “Zip” of Weed Mean?
A zip is common cannabis slang for an ounce, so in dispensary-style weight math it usually means about 28 grams of flower.
You do not need to use slang at a dispensary. “One ounce,” “half ounce,” “quarter,” or “eighth” is clearer. If somebody says “zip,” though, now you know they are not suddenly talking about computer files.
Can You Tell How Many Grams of Weed You Have Just by Looking?
Not reliably. Cannabis flower is sold by weight, not by how much space it takes up.
Some flower is dense and compact. Other flower is airy and fluffy. Moisture, trim, bud structure, and cure can also change how much room the same weight takes up. That is why object comparisons like “an eighth looks like a golf ball” or “an ounce looks like a coconut” are shaky at best.
Two piles can look completely different and still weigh 3.5 grams each. Your eyes are excellent at many things. Pretending to be a calibrated scale is not one of them.
How Do Weed Measurements Affect Price?
Weight is only one part of cannabis pricing. Brand, flower quality, cultivation, batch, age, promotions, taxes, and local supply can all change the final price. That is why a fixed “weed measurements price chart” becomes outdated quickly.
A better comparison is price per gram:
Price per gram = package price ÷ number of grams
That lets you compare a 3.5-gram package with a 7-gram or 14-gram package without assuming the larger package is automatically the better value. Check the current menu instead of trusting an evergreen price table that was probably old before the page finished loading.
How Much Cannabis Can You Buy in New Mexico?
For adult-use cannabis, the New Mexico Cannabis Control Division says consumers can buy up to 2 ounces of cannabis at one time. Using the common 28-gram dispensary conversion, that is about 56 grams of flower.
The state lists separate limits for concentrates, edibles, and immature plants, so do not convert every product into “ounces of weed” and assume the same rule applies. For travel, public possession, federal land, and state-line questions, use Bud Board’s New Mexico cannabis laws for visitors guide.
How Is Cannabis Weight Shown on a New Mexico Label?
New Mexico’s finished-product labeling rule requires the main display panel to show net quantity, net weight, or volume in both U.S. customary and metric units.
That is why a flower package may show both a fraction of an ounce and a gram amount. A 3.5-gram package might also be described as an eighth. A 7-gram package is a quarter. The two labels are just different ways of describing the same weight.
When the nickname and the package feel confusing, trust the printed net weight. For more beginner-friendly label and product education, visit Bud Board’s Cannabis Education hub.
What Bud Board Budtenders Hear at the Counter
“When someone asks for an eighth, a quarter, or an ounce, the easiest thing is to translate it back to grams so everybody is talking about the same amount.”
“Cannabis measurements look like advanced math until you realize an ounce is just eight eighths. The fractions are mostly trying to look important.”
Buying More? Store It Like You Plan to Keep It
If you buy a larger amount, storage matters more. Keep cannabis labeled, sealed, secured, and away from children and pets. Flower also does better away from heat, direct light, and unnecessary air exposure.
Bud Board’s safe cannabis storage guide covers the home-storage side in more detail. An ounce that dries out in a sunny windowsill is still 28 grams of regret.
Key Takeaways
- A dispensary ounce of weed is commonly treated as 28 grams.
- The standard ounce-to-gram conversion is about 28.35 grams.
- An eighth is 3.5 grams, a quarter is 7 grams, and a half ounce is 14 grams.
- “Zip” is common slang for an ounce.
- Do not estimate cannabis weight by how large the buds look. Density varies.
- For price comparisons, divide the package price by its gram weight instead of relying on a fixed price chart.
- New Mexico adult-use customers can buy up to 2 ounces of cannabis at one time under current state guidance.
- New Mexico labels must show net quantity, weight, or volume in U.S. customary and metric units.
Official Sources
Frequently Asked Questions
How many grams are in an ounce of weed?
A dispensary ounce of cannabis flower is commonly treated as 28 grams. The standard U.S. ounce conversion is about 28.35 grams.
How many grams are in an eighth of weed?
An eighth is 3.5 grams. It is one-eighth of the 28-gram ounce commonly used on cannabis menus.
How many grams are in a quarter of weed?
A quarter ounce is 7 grams.
How many grams are in a half ounce of weed?
A half ounce is 14 grams.
How many eighths are in an ounce?
There are eight eighths in one ounce. Eight packages at 3.5 grams each total 28 grams.
What is a zip of weed?
“Zip” is common slang for one ounce of cannabis, or about 28 grams in typical dispensary weight math.
Is an ounce exactly 28 grams?
No. The standard U.S. weight conversion is about 28.35 grams per ounce. Cannabis retail commonly uses 28 grams as the practical ounce measurement.
Can I tell how many grams of weed I have by looking at it?
Not accurately. Bud density, moisture, structure, and trim can make the same weight look very different. Use the labeled net weight or a properly calibrated scale rather than visual size.
How many grams of flower can an adult-use customer buy at once in New Mexico?
Current New Mexico guidance allows adult-use consumers to buy up to 2 ounces of cannabis at one time. Using the common dispensary conversion, that is about 56 grams of flower.
Helpful Next Step
Still looking at a menu wondering whether 3.5g, 7g, or 14g makes the most sense? Check the current menu or stop by a Bud Board location in Carlsbad or Hobbs and ask a budtender to translate the package size into plain English. No calculator watch required.