If cannabis measurements are confusing, you are not alone. Terms such as gram, eighth, quarter, half-ounce, zip, and quarter pound are commonly used when talking about cannabis, but they do not all mean the same thing.
The good news is that the basic math is simple once you know how the measurements relate to one another.
A gram is the starting point. An ounce contains about 28.35 grams, according to the National Institute of Standards and Technology (NIST). Cannabis sellers commonly round this to 28 grams per ounce for everyday purchasing and labeling.
This guide breaks down weed measurements and weights in plain English, including common conversions, cannabis slang, how to compare quantities, and what you should know about buying and storing cannabis legally.
Cannabis Measurements at a Glance
Here is the basic conversion chart:
| Cannabis amount | Ounces | Grams |
|---|---|---|
| 1 gram | 1/28 oz | 1 g |
| 2 grams | About 1/14 oz | 2 g |
| Eighth | 1/8 oz | 3.5 g |
| Quarter | 1/4 oz | 7 g |
| Half ounce | 1/2 oz | 14 g |
| One ounce | 1 oz | 28 g |
| Quarter pound | 4 oz | About 113 g |
| Half pound | 8 oz | About 227 g |
| One pound | 16 oz | About 454 g |
The exact ounce-to-gram conversion is 28.349523125 grams per avoirdupois ounce. The familiar 28-gram cannabis ounce is a practical rounded value.
How Is Cannabis Measured?
Cannabis flower is generally sold by mass, most commonly in grams or fractions of an ounce.
This can seem confusing because cannabis terminology combines metric and U.S. customary units. You might see a package labeled 3.5 g, while someone casually calls the same amount an eighth.
They describe the same quantity:
3.5 grams = 1/8 of an ounce
From there, the measurements scale up:
- 3.5 g = 1/8 ounce
- 7 g = 1/4 ounce
- 14 g = 1/2 ounce
- 28 g = 1 ounce
The appearance of a particular amount can vary significantly. Dense buds may look much smaller than fluffy flower even when both weigh exactly the same.
That is why weight is more reliable than appearance when determining how much cannabis you have.
What Is a Gram of Weed?
A gram is one of the smallest standard quantities of cannabis flower commonly discussed.
If you are trying a strain for the first time, a small quantity can be a practical way to decide whether you like it before purchasing more.
How Much Is 1 Gram?
1 gram = 1 g
A gram is also approximately 1/28 of a rounded 28-gram cannabis ounce.
There is no universal visual size for a gram. One gram of dense flower can look very different from one gram of loose, airy flower.
How Many Joints Are in a Gram?
There is no fixed answer because joint size varies.
A person who uses smaller amounts per joint may get several sessions from a gram, while someone who rolls larger joints may use the entire gram at once.
For the same reason, it is better not to estimate cannabis quantities based on the number of joints alone.
What Is an Eighth of Weed?
An eighth means one-eighth of an ounce.
In everyday cannabis terminology:
1 eighth = 3.5 grams
It is one of the most commonly recognized cannabis measurements.
Why Is It Called an Eighth?
The name comes directly from the fraction:
1 ounce ÷ 8 = 1/8 ounce
Using the common rounded cannabis conversion of 28 grams per ounce:
28 g ÷ 8 = 3.5 g
So when someone says they bought an “eighth,” they generally mean approximately 3.5 grams of cannabis flower.
Is an Eighth the Same as 3.5 Grams?
Yes.
For practical cannabis purchasing, an eighth and 3.5 grams refer to the same amount.
What Is a Quarter of Weed?
A quarter is one-quarter of an ounce.
1 quarter = 7 grams
It is exactly twice the amount in an eighth.
For example:
- 1 eighth = 3.5 g
- 2 eighths = 7 g
- 7 g = 1 quarter ounce
You may also hear a quarter referred to as a quad in cannabis slang.
What Is a Half Ounce of Weed?
A half ounce is exactly what its name suggests: half of an ounce.
1/2 ounce = 14 grams
It can also be thought of as:
- 4 eighths
- 2 quarters
- 14 individual grams
If you are comparing quantities, remembering the progression makes the math easier:
3.5 g → 7 g → 14 g → 28 g
Each step doubles the previous amount.
What Is an Ounce of Weed?
An ounce is one of the largest standard quantities commonly discussed for personal cannabis purchases.
1 ounce ≈ 28 grams
You may hear an ounce called as:
- Zip
- O
- Z
The term “zip” is common cannabis slang for an ounce.
Because an ounce is a legal possession limit in some jurisdictions but not others, you should never assume that possessing 28 grams is legal everywhere. Cannabis laws vary considerably by state.
What Is a Quarter Pound of Weed?
A quarter pound is much larger than the standard personal-use quantities discussed above.
1 quarter pound = 4 ounces
Using the standard conversion:
4 × 28.3495 g ≈ 113.4 g
So a quarter pound is approximately 113 grams.
You may see the abbreviation QP used for this quantity.
Larger measurements such as quarter pounds, half pounds, and pounds are generally more relevant to commercial cultivation, production, or industry terminology than ordinary personal purchases. The legal status of possessing such quantities depends on applicable federal, state, and local law.
What Are the Larger Cannabis Measurements?
Once you understand an ounce, the larger quantities are straightforward.
Half Pound
1/2 pound = 8 ounces
That is approximately 227 grams.
Full Pound
1 pound = 16 ounces
That is approximately 454 grams.
Simple Conversion
Think of the progression this way:
1 oz → 4 oz → 8 oz → 16 oz
Or:
28 g → 113 g → 227 g → 454 g
These larger quantities are not typical personal shopping measurements at licensed retail stores.
Common Cannabis Measurement Slang
Cannabis terminology can vary depending on the region, age group, and whether someone is talking about a licensed dispensary or an informal market.
Here are some terms you may encounter:
| Slang | Usually refers to |
|---|---|
| Eighth | 3.5 g |
| Quad | 7 g |
| Half | 14 g |
| Half-zip | 14 g |
| Zip | 28 g |
| O | 28 g |
| QP | About 113 g |
Older terms such as dime bag and dub come from informal pricing traditions and may not represent a standardized quantity today.
For example, a “dub” has historically referred to around 2 grams, but the term is not a standardized retail measurement.
If you are buying from a licensed dispensary, rely on the weight printed on the product packaging rather than slang.
Why Does Cannabis Weight Matter?
Knowing the weight helps you understand exactly how much product you are purchasing.
It can also help you compare products more fairly.
Imagine two products:
- Product A: $35 for 3.5 g
- Product B: $60 for 7 g
At first glance, the second product costs more. But the price per gram tells you more.
Product A
$35 ÷ 3.5 g = $10 per gram
Product B
$60 ÷ 7 g = about $8.57 per gram
So Product B has the lower price per gram.
That does not automatically make it the better purchase. Potency, quality, taxes, freshness, and your personal needs also matter.
How to Calculate Cannabis Price Per Gram
The formula is simple:
Total price ÷ total grams = price per gram
For example, if a product costs $48 and contains 7 grams:
$48 ÷ 7 = $6.86 per gram
This calculation lets you compare different package sizes using the same measurement.
However, compare products within a similar quality and potency range. A cheaper price per gram does not necessarily mean better overall value.
Does More Cannabis Always Mean a Better Deal?
Not necessarily.
Larger packages can have a lower price per gram, but buying more than you can reasonably use may not be worthwhile.
Cannabis flower can lose quality when it is stored poorly or exposed to unfavorable conditions. Buying a larger quantity only makes financial sense if you can store it properly and use it within a reasonable period.
When comparing cannabis products, consider:
- Price per gram
- THC and CBD content
- Product quality
- Freshness
- Storage needs
- Local taxes
- Your state’s possession rules
- How frequently you use cannabis
Does Cannabis Weight Determine Potency?
No.
Weight and potency are different measurements.
Two 3.5-gram cannabis products can have very different THC concentrations.
For example, one flower product might contain 15% THC while another contains 25%. The total weight is identical, but the concentration of THC is different.
The CDC notes that the effects of cannabis depend on several factors, including the amount and concentration of THC, frequency of use, method of consumption, and individual characteristics.
So you should never assume that a heavier package automatically means a stronger product.
What Is the Difference Between Weight and THC Dose?
This distinction becomes especially important with cannabis products.
Weight tells you how much physical material is present.
THC concentration tells you how much THC is present relative to the product.
For flower, a package may list total weight and cannabinoid percentages separately.
Edibles are different because the label may provide a specific number of milligrams of THC per serving and per package. The CDC notes that edible cannabis can have delayed effects and that THC amounts can sometimes be difficult to measure accurately.
That is why grams of flower should not be treated as equivalent to milligrams of THC.
How Do You Convert Grams to Ounces?
The basic formula is:
grams ÷ 28.35 = ounces
For example:
7 g ÷ 28.35 ≈ 0.25 oz
So 7 grams is approximately one-quarter of an ounce.
Here are some useful conversions:
| Grams | Approximate ounces |
|---|---|
| 1 g | 0.035 oz |
| 2 g | 0.071 oz |
| 3.5 g | 0.125 oz |
| 7 g | 0.25 oz |
| 14 g | 0.5 oz |
| 28 g | 1 oz |
| 56.7 g | 2 oz |
| 113.4 g | 4 oz |
NIST provides the standard conversion of one avoirdupois ounce to approximately 28.3495 grams.
How Do You Convert Ounces to Grams?
Use the opposite calculation:
ounces × 28.35 = grams
Examples:
- 1/8 oz × 28.35 = about 3.54 g
- 1/4 oz × 28.35 = about 7.09 g
- 1/2 oz × 28.35 = about 14.17 g
- 1 oz × 28.35 = about 28.35 g
In cannabis conversations, these are commonly rounded to 3.5 g, 7 g, 14 g, and 28 g.
Can You Tell Cannabis Weight by Looking at It?
Not accurately.
The same weight can occupy very different amounts of space depending on the flower’s density, moisture level, structure, and how it has been handled.
A compact nug may look smaller than a fluffy nug while weighing exactly the same.
For that reason, visual comparisons are useful only as rough illustrations. They should not replace an actual measurement.
How Can You Weigh Cannabis Accurately?
If you need to determine the mass of a product, a properly calibrated digital scale is much more reliable than estimating by sight.
For ordinary weight measurements, choose a scale appropriate for the amount you are measuring and make sure it is placed on a stable, level surface.
A basic process is:
- Turn on the scale.
- Place the empty container on it.
- Use the tare function to set the container weight to zero.
- Add the material.
- Read the displayed mass.
For regulated cannabis purchases, the product’s labeled net weight should be your primary reference.
Why Does Cannabis Look Different at the Same Weight?
Cannabis flower is not uniform in shape or density.
Two samples can weigh 3.5 grams while looking completely different.
Factors that affect appearance include:
- Bud density
- Moisture content
- Flower structure
- Trim quality
- Size of individual buds
- How tightly the flower has been packed
This is why statements such as “that does not look like an eighth” are not reliable measurements.
A scale measures mass. Your eyes measure appearance.
How Much Cannabis Should You Buy?
There is no single amount that is right for everyone.
If you are unfamiliar with a product, buying a smaller package can reduce the chance of ending up with more than you want.
For experienced consumers, larger packages may be more convenient or offer a lower price per gram. But the quantity should still fit within the applicable possession rules and your ability to store the product properly.
If cannabis is being used for medical purposes, follow the recommendations of your healthcare professional and the rules of your state’s medical cannabis program.
Does Cannabis Have the Same Possession Limit Everywhere?
No.
Cannabis possession laws are determined by jurisdiction and can change over time. Some states allow adults to possess up to one ounce of cannabis flower, while others have different limits.
Medical cannabis programs may also use different possession or purchase limits.
Do not assume that the common 28-gram ounce automatically represents your legal limit.
Before purchasing or carrying cannabis, check the current rules issued by the relevant state cannabis regulator.
What About Medical Cannabis Patients?
Medical cannabis patients may be subject to rules that differ from adult-use consumers.
Depending on the state, a medical program may specify:
- Maximum purchase amounts
- Possession limits
- Purchase periods
- Product limits
- Patient registration requirements
The amount you can legally purchase or possess is therefore a legal question, not simply a conversion question.
If you participate in a medical cannabis program, check your state’s current rules rather than relying on general cannabis terminology.
Cannabis Measurements vs. Cannabis Dosing
One of the most important distinctions for new consumers is that measurement does not equal dosage.
A gram tells you the mass of cannabis flower. It does not tell you exactly how much THC your body will receive.
The effects of cannabis can vary based on THC concentration, consumption method, individual biology, previous experience, and other factors.
For this reason, someone should not assume that consuming a certain number of grams will produce a predictable effect.
Edibles deserve particular caution because their effects can take longer to appear and may last longer than expected.
A Simple Cannabis Weight Cheat Sheet
If you only remember a few measurements, remember these:
- 1 eighth = 3.5 grams
- 1 quarter = 7 grams
- 1 half ounce = 14 grams
- 1 ounce = about 28 grams
- 1 quarter pound = about 113 grams
- 1 half pound = about 227 grams
- 1 pound = about 454 grams
Once you know these numbers, most cannabis weight terminology becomes much easier to understand.
Frequently Asked Questions
How many grams are in an eighth of weed?
An eighth is 3.5 grams in common cannabis terminology. It represents one-eighth of a rounded 28-gram ounce.
How many grams are in a quarter of weed?
A quarter contains 7 grams. It is twice the amount found in an eighth.
How many grams are in a half ounce of weed?
A half ounce contains approximately 14 grams. More precisely, half of 28.3495 grams is about 14.17 grams, but cannabis quantities are commonly rounded to 14 grams.
How many grams are in an ounce of weed?
An ounce is approximately 28 grams in common cannabis terminology. The precise avoirdupois conversion is 28.3495 grams.
What does “zip” mean in cannabis?
“Zip” is common slang for one ounce of cannabis, or approximately 28 grams.
What does “quad” mean?
A “quad” commonly refers to 7 grams, or one-quarter of an ounce.
What is a dub?
A dub or dub sack has historically referred to approximately 2 grams of cannabis. Unlike standard gram or ounce measurements, the term comes from informal cannabis-market terminology and may not be used consistently.
Is 3.5 grams the same as an eighth?
Yes. An eighth means one-eighth of an ounce, which is commonly represented as 3.5 grams in the cannabis market.
Is 7 grams a quarter?
Yes. 7 grams is commonly called a quarter, meaning one-quarter of an ounce.
Is 14 grams a half ounce?
Yes. 14 grams is commonly used as the cannabis-market equivalent of a half ounce. The precise conversion is about 14.17 grams.
Is 28 grams exactly one ounce?
Technically, no. One avoirdupois ounce equals approximately 28.3495 grams. Cannabis terminology commonly rounds an ounce to 28 grams for practical purposes.
Does more cannabis mean a stronger effect?
Not necessarily. Weight and potency are different. The THC concentration, amount consumed, consumption method, individual factors, and other variables can influence the effects.
Can I use appearance to estimate how much cannabis I have?
Appearance is not a reliable way to determine weight. Cannabis flowers differ in density and structure, so two samples of the same weight may look very different.
Final Takeaway
Understanding weed measurements and weights does not require complicated math.
The most useful numbers to remember are:
- 3.5 grams = an eighth
- 7 grams = a quarter
- 14 grams = a half ounce
- 28 grams = a commonly rounded ounce
From there, larger quantities are simply multiples of an ounce.
Just remember that weight, THC potency, dosage, price, and legal possession limits are separate things. A 28-gram package does not automatically mean 28 grams is legal for you to possess, and a heavier cannabis product is not necessarily more potent.
For accurate conversions, NIST is a reliable reference for standard mass units. For questions about cannabis effects and health risks, the CDC provides current public-health information.