Quick Answer: A “zip” is slang for one ounce of cannabis, which is equal to 28 grams. The term is widely used in cannabis culture across North America to describe the largest common single-purchase quantity at a dispensary.
If you’ve heard someone mention picking up “a zip” and wondered exactly how much that is in grams, you’re not alone — it’s one of the most searched cannabis measurement terms. This guide covers exactly how many grams are in a zip, where the term came from, how it compares to other common cannabis measurements, and answers to the questions people ask most.
How Much Is a Zip in Grams? The Simple Answer
1 zip = 1 ounce = 28 grams
Technically, a true imperial ounce is 28.3495 grams, but the cannabis industry — from dispensaries to street-level transactions — has long rounded this down to an even 28 grams for simplicity. This rounded figure is now the universal standard used across legal and unregulated markets alike.
Quick Reference Table
| Term | Weight in Grams | Weight in Ounces |
|---|---|---|
| Half a zip | 14 g | 0.5 oz |
| A zip | 28 g | 1 oz |
| Two zips | 56 g | 2 oz |
| A quarter-pound | 112 g | 4 oz |
| A half-pound | 224 g | 8 oz |
| A pound | 448 g | 16 oz |
Where Does the Term “Zip” Come From?
The origin of “zip” is generally traced back to the pre-legalization era of cannabis culture, when an ounce of flower was commonly packaged and sold in a standard-sized Ziploc bag. Over time, “zip” became shorthand for “an ounce’s worth” — the amount that would comfortably fit and seal inside that bag.
Even now, in states and countries with fully legal, regulated cannabis markets where ounces are sold in branded jars, tins, or mylar bags rather than sandwich bags, the term “zip” has stuck around as a piece of enduring cannabis slang. Ask for “a zip” at a licensed dispensary today, and staff will understand exactly what you mean — no Ziploc bag required.
How to Convert Zips to Grams
The Formula
Grams = Number of Zips × 28
Worked Examples
| Conversion | Calculation | Result |
|---|---|---|
| 1 zip to grams | 1 × 28 | 28 g |
| 0.5 zip (half zip) to grams | 0.5 × 28 | 14 g |
| 2 zips to grams | 2 × 28 | 56 g |
| 4 zips (quarter-pound) to grams | 4 × 28 | 112 g |
| 16 zips (1 pound) to grams | 16 × 28 | 448 g |
Example in context: If someone splits a zip evenly between two people, each person gets 28 ÷ 2 = 14 grams, which is also known as a “half zip.”
Full Cannabis Weight & Slang Conversion Chart
Cannabis measurements combine imperial (ounces, pounds) and metric (grams) units in a way that can be confusing for newcomers. Here’s the complete breakdown from smallest to largest common purchase size:
| Slang Term | Fraction of an Ounce | Grams |
|---|---|---|
| A dab / crumb | — | ~0.1–0.5 g |
| A gram (“a g”) | 1/28 oz | 1 g |
| A dime bag (historical) | — | ~1 g |
| A sixteenth | 1/16 oz | ~1.75 g |
| An eighth | 1/8 oz | 3.5 g |
| A quarter | 1/4 oz | 7 g |
| A half (half-zip) | 1/2 oz | 14 g |
| A zip / an ounce | 1 oz | 28 g |
| A quarter-pound (Q.P.) | 4 oz | 112 g |
| A half-pound | 8 oz | 224 g |
| A pound (P) | 16 oz | 448 g |
Tip: Most legal dispensary menus list weight in grams for smaller amounts (eighths, quarters) and switch to “ounce” or “zip” labeling once you reach the full-ounce tier.
Zip vs. Other Common Weight Units
For readers more familiar with general (non-cannabis) unit conversion, here’s how a zip lines up against standard weight measurements:
| Unit | Equal To |
|---|---|
| 1 zip | 1 oz / 28 g |
| 1 standard US ounce | 28.35 g (rounded to 28 g in cannabis contexts) |
| 1 gram | 0.001 kg |
| 1 pound | 16 oz / 453.6 g / 16 zips |
Unlike the exact, fixed conversion between grams and kilograms (1 kg = 1,000 g), the “zip = 28 g” figure is a rounded, culturally standardized approximation of the true imperial ounce (28.3495 g) — close enough that the small difference is irrelevant at consumer purchase quantities.
How Long Does a Zip Last?
Since a zip is a relatively large quantity, how long it lasts depends heavily on usage frequency:
| Usage Level | Approximate Duration |
|---|---|
| Daily/heavy user | 2–4 weeks |
| Moderate user (few times a week) | 1–2 months |
| Occasional user | 3–6 months (with proper storage) |
A single zip (28 grams) can typically be broken down into roughly 28 full-gram joints or 56 half-gram joints, though actual yield varies by how tightly it’s packed and personal rolling habits.
Legal Status and Buying a Zip
Cannabis laws vary significantly by country, and within the US, by state. Before purchasing or possessing a zip’s worth of cannabis, it’s important to check:
- Whether cannabis is legal (medical, recreational, or both) in your jurisdiction
- Local possession limits — in many US states, one ounce (one zip) is the maximum amount a person can legally purchase or carry at a time for recreational use
- Whether a medical card or license is required to purchase larger quantities
Because legal frameworks shift frequently, always verify current local regulations through an official state or national regulatory source before buying or possessing any amount of cannabis.
Common Mistakes When Talking About Zips
- Assuming “zip” always means exactly 28.35 grams. In practice, the cannabis industry rounds to 28 g flat — a small but consistent simplification from the precise imperial ounce.
- Confusing a “zip” with a “zip of concentrate” or edibles. The zip measurement traditionally refers to dried flower; concentrates, vape cartridges, and edibles are usually measured and priced differently (by weight of concentrate, mg of THC, etc.), not by the flower-based zip standard.
- Mixing up “half a zip” with “an eighth.” A half zip is 14 grams (half an ounce), while an eighth is 3.5 grams (one-eighth of an ounce) — a common point of confusion for newer buyers.
- Ignoring local possession limits. Just because a zip is a standard purchase unit doesn’t mean it’s legal to buy or carry in every location — always check local law.
Frequently Asked Questions
How much is a zip in grams?
A zip is 28 grams, which is the cannabis industry’s standard rounded equivalent of one ounce (technically 28.3495 grams).
Why is an ounce of weed called a zip?
The term comes from the fact that an ounce of cannabis traditionally fit neatly into a standard Ziploc bag, which needed to be “zipped” shut — the nickname stuck even as packaging has modernized.
How many grams are in half a zip?
Half a zip is 14 grams, which is the same as half an ounce.
How many zips are in a pound?
There are 16 zips in a pound, since one pound equals 16 ounces and each zip is 1 ounce.
Is a zip the same as an ounce?
Yes. “Zip” and “ounce” are used interchangeably in cannabis slang — both refer to the same 28-gram quantity.
How many joints can you roll from a zip?
A single zip (28 grams) typically yields around 28 full-gram joints or roughly 56 half-gram joints, though this varies based on rolling style and how tightly the cannabis is packed.
What’s the difference between a zip and an eighth?
An eighth is 3.5 grams (1/8 of an ounce), while a zip is a full ounce (28 grams) — a zip contains exactly eight eighths.
Is it legal to buy a zip of weed?
It depends entirely on your local laws. In jurisdictions where cannabis is legal, a one-ounce (one-zip) purchase or possession limit is common for recreational users, but limits and legality vary widely by state and country. Always check current local regulations before purchasing.
How much does a zip of weed cost?
Prices vary widely by location, quality, and legal status, generally ranging from around $100 to $400. Always check current pricing with a licensed local source, as costs shift with regulation, taxes, and market conditions.
Does “zip” ever refer to substances other than cannabis?
While “zip” is most commonly associated with cannabis, the term has occasionally been used more loosely in slang to describe an ounce of other substances. In this article, “zip” refers specifically to its standard, most common usage: an ounce of cannabis flower.
Key Takeaways
- A zip = 1 ounce = 28 grams, the standard rounded cannabis-industry equivalent of a true 28.3495-gram imperial ounce.
- The term originated from cannabis traditionally being packaged in a Ziploc bag, and has remained popular slang even in modern legal markets.
- A zip breaks down into 8 eighths, 4 quarters, or 2 halves — and 16 zips make up a full pound.
- Always confirm current local laws and possession limits before buying or carrying cannabis, since legality and quantity limits vary by state and country.
- Whether you’re a new consumer trying to decode dispensary terminology or just curious about cannabis slang, knowing that a zip equals 28 grams is the foundation for understanding every other cannabis weight measurement.