- An eighth means an eighth of an ounce of cannabis flower — 3.5 grams. It's the most common amount people buy, which is why you hear it most.
- The full ladder, smallest to largest: gram (1 g) → eighth (3.5 g) → quarter (7 g) → half (14 g) → ounce (28 g). From the eighth up, each step roughly doubles.
- How to choose comes down to how often you shop and freshness, not a magic number — a gram or eighth to try something new, a quarter or larger for a go-to you buy often.
- New York lets adults 21+ carry up to 3 ounces of flower in public — about 85 grams, or roughly two dozen eighths — so a normal purchase is nowhere near the limit. Every weight is on the label at Cannabis Cowboy.
Walk up to a New York dispensary menu for the first time and the flower is listed by weight — a gram here, an eighth there, quarters and ounces further down. If you've never bought before, "an eighth" can sound like a riddle. It isn't. Every one of those words is simply a fraction of an ounce, and once you see the pattern the whole menu reads in about ten seconds. Here's the system, why an eighth is 3.5 grams, and how to pick an amount that fits how you actually shop.
What is an eighth of weed?
An eighth is one-eighth of an ounce of cannabis flower, which works out to 3.5 grams. That's the whole trick — the name is the math. It's the single most common amount people buy, which is why it's the term you'll hear most and see most on a menu.
Cannabis flower in the United States is sold in imperial fractions — halves, quarters, eighths of an ounce — a holdover from how it has always been weighed, even though everything is also labeled in grams. So the menu speaks both languages at once: an eighth (the fraction) and 3.5 g (the metric). They're the same thing, printed two ways.
What's the full cannabis weight ladder, gram to ounce?
Here's the complete set of amounts you'll come across, smallest to largest. Notice that from the eighth up, each step is roughly double the one before it:
- Gram (1 g) — the smallest common amount, and often how a single pre-roll is sized. A good "try it once" quantity.
- Eighth (3.5 g) — an eighth of an ounce; the most popular flower purchase.
- Quarter (7 g) — a quarter ounce, which is two eighths.
- Half (14 g) — a half ounce; two quarters, or four eighths.
- Ounce (28 g) — a full ounce, the largest standard unit — eight eighths in all.
Why is an eighth 3.5 grams and not 3 or 4?
Because it's literally one-eighth of an ounce. Take the rounded ounce — 28 grams — and divide by eight: 28 ÷ 8 = 3.5. That's where 3.5 grams comes from, and it's why the number isn't a rounder-looking 3 or 4. The same division explains the rest of the ladder: a quarter is 28 ÷ 4 = 7 grams, and a half is 28 ÷ 2 = 14 grams.
How do the amounts add up?
Once you anchor on the eighth, everything else is just multiples of it. This is the part that makes a menu click:
- 2 eighths = 1 quarter (7 g)
- 4 eighths = 1 half (14 g)
- 8 eighths = 1 ounce (28 g)
- 2 quarters = 1 half, and 2 halves = 1 ounce
So if you remember only one number — an eighth is 3.5 grams — you can back into any other amount on the menu without a calculator.
How much should I buy?
The right amount isn't a magic number. It mostly comes down to how often you shop and how fresh you like your flower. A few honest rules of thumb:
- Trying something new? A gram or an eighth lets you sample a strain without committing to a large amount of something you haven't had before.
- Have a go-to you buy regularly? Stepping up to a quarter, half, or ounce means fewer trips to the shop for the same product.
- Shopping for more than one occasion? Larger sizes cover you for longer — with the trade-off below.
That trade-off is freshness. Cannabis flower is at its best when it's fresh; stored properly — cool, dark, and in a sealed container — it keeps for months, but it isn't something to stockpile. Buy what you'll realistically get through while it's good, and come back for more rather than sitting on a large amount. If you're unsure, a budtender can point you to a size that fits how often you plan to visit.
Do vapes, concentrates, and edibles use the same weights?
No — the gram / eighth / ounce ladder is specifically for cannabis flower (the dried bud). Other categories are measured differently:
- Concentrates (vape cartridge oil, wax, rosin) are sold in grams, but they're a separate, far more concentrated product — a half-gram or full-gram cartridge is common. New York even counts concentrate under its own separate carry limit.
- Edibles aren't weighed in grams of cannabis at all; they're measured in milligrams (mg) of THC per serving and per package. See how to read an edibles label.
- Pre-rolls are flower, so they come back to grams — a single pre-roll is usually about one gram.
So "an eighth" only ever refers to flower. If a menu lists an edible or a cartridge, look for the mg figure or that product's own gram weight instead.
How do these weights fit New York's carry limit?
New York's adult-use law is written in the same units, so the weights map straight onto it. If you're 21 or older, you can carry up to 3 ounces of cannabis flower — about 85 grams, or roughly two dozen eighths — on you in public, plus a separate 24 grams of concentrate. A normal flower purchase is nowhere near that: even a full ounce is only a third of the public limit. For the complete rundown — public versus at-home limits, and where you can legally use it — see how much cannabis you can legally carry in New York.
How do I read the weight on a New York menu or label?
Every product sold through a licensed New York dispensary lists its net weight right on the menu and the label — the eighth, quarter, or gram amount, in plain grams. That isn't just convenience; it's how you know exactly what you're getting and stay on the right side of the carry limit. Licensed flower is weighed and packaged to New York's rules, so 3.5 grams on the label means 3.5 grams in the jar.
That accuracy is a real difference between a licensed shop and an unlicensed one, where amounts often aren't weighed or labeled reliably at all. At Cannabis Cowboy in Richmond Hill, Queens (NY OCM-RETL-24-000068), every item on the live menu shows its weight, so you can compare a gram, an eighth, and an ounce at a glance before you ever walk in — bring a 21+ ID.
Cannabis weights, at a glance
- Gram = 1 g · Eighth = 3.5 g · Quarter = 7 g · Half = 14 g · Ounce = 28 g.
- An eighth is one-eighth of an ounce; 28 ÷ 8 = 3.5 grams. It's the most common flower purchase.
- From the eighth up, each step doubles: 2 eighths = a quarter, 4 = a half, 8 = an ounce.
- Flower uses this ladder; concentrates are sold in grams (separately), edibles in mg of THC.
- New York adults 21+ can carry up to 3 oz of flower (~85 g, about 24 eighths) plus 24 g of concentrate in public.