Quick answer: Cannabis is sold in five standard sizes: a gram (1 g), an eighth (3.5 g), a quarter (7 g), a half (14 g) and an ounce (28 g). The sizes come from dividing an ounce, which is actually about 28.35 g but is rounded to 28 g. In Canada, adults can carry up to 30 g of dried cannabis (or the equivalent) in public, which is just over an ounce. Bigger sizes usually cost less per gram.
Cannabis sizing mixes metric and imperial in a way that confuses almost everyone at first: you buy in grams, but the sizes are named after fractions of an ounce. Once you know the five standard amounts, menus, prices and possession limits all make sense. Here’s a plain guide to weed measurements, from a single gram to a full ounce.
Weed Measurements at a Glance
| Name | Grams | Fraction of an ounce | Common slang | Joints at 0.5 g each |
|---|---|---|---|---|
| Gram | 1 g | about 1/28 | a “g” | about 2 |
| Eighth | 3.5 g | 1/8 | “an eighth,” “an eight-ball” | about 7 |
| Quarter | 7 g | 1/4 | “a Q,” “a quarter” | about 14 |
| Half | 14 g | 1/2 | “a half,” “a half-O” | about 28 |
| Ounce | 28 g | 1 | “an O,” “a zip,” “an oz” | about 56 |
Joint counts depend on how much you roll per joint; see how many joints are in an ounce for every fill size, or how to roll a king size joint if you’re using bigger papers.
Each Size Explained
Gram (1 g)
The basic unit. A gram is enough for a couple of standard joints or a few bowls, and it’s a good way to try a new strain without committing to more. Single grams usually have the highest price per gram.
Eighth (3.5 g)
The most popular size. It’s one-eighth of an ounce: 28 ÷ 8 = 3.5. It’s a sensible amount for occasional consumers or for sampling a few strains at once.
Quarter (7 g)
Two eighths, or a quarter of an ounce. A common pick for regular weekend consumers.
Half (14 g)
Half an ounce. This is where per-gram savings usually start to add up, and it’s a good size for daily consumers who want a couple of weeks’ supply.
Ounce (28 g)
A full ounce, rounded down from 28.35 g. It’s usually the best value per gram, and it fits within Canada’s 30 g public possession limit. For deals on bigger sizes, see where to find the cheapest ounce deals in Canada.
How to Compare Prices: Price Per Gram
The easiest way to compare sizes is to divide the price by the grams. Here’s how it works with Blue Dream on our menu at the time of writing:
| Size | Price | Price per gram |
|---|---|---|
| 3.5 g | $15 | about $4.29 |
| 7 g | $30 | about $4.29 |
| 14 g | $60 | about $4.29 |
| 28 g | $100 | about $3.57 |
Buying the ounce here works out to $20 less than buying eight eighths separately. Prices change, so always check the current menu. A bigger size is only a better deal if you’ll use it before it dries out; our guides on keeping flower fresh and reviving dry weed can help. For more on why prices vary between products, see why some cannabis is more expensive than others.
How Much Can You Carry in Canada?
Adults 19+ in Ontario (and most provinces) can carry up to 30 grams of dried cannabis, or the equivalent, in public. For other products, the Cannabis Act sets how much counts as the same as 1 gram of dried cannabis:
| Product type | Equal to 1 g of dried cannabis | 30 g limit works out to |
|---|---|---|
| Dried cannabis | 1 g | 30 g |
| Fresh cannabis | 5 g | 150 g |
| Solid edibles (gummies, chocolate) | 15 g | 450 g |
| Non-solid products (e.g. oils), excluding drinks | 70 g | 2.1 kg |
| Cannabis drinks | 570 g | about 17.1 kg |
| Concentrates (vapes, shatter) | 0.25 g | 7.5 g |
| Seeds | 1 seed | 30 seeds |
The limit covers everything you’re carrying combined, not each product separately. Rules for home storage and growing vary by province, and taking cannabis across the border is illegal. See the legal age to buy cannabis in Ontario and our guide to travelling with weed.
Why Your Weed Might Weigh a Little Less
- Moisture loss: flower loses a little weight as it dries out after packaging.
- Packaging: weigh the flower, not the container. Use the tare button on a digital scale.
- Scale accuracy: cheap scales can be off by a few tenths of a gram. Check yours with a known weight.
- Bud density: dense buds can look smaller than fluffy ones at the same weight, so trust the scale, not your eyes.
Legal products in Canada list the net weight on the label, so you can check it against your scale. Here’s how to read a cannabis label.
Which Size Should You Buy?
- Trying something new: a gram or an eighth.
- Occasional use: an eighth or a quarter.
- Regular use or sharing: a half or an ounce for the best value.
- On a budget: look at milled flower or popcorn buds, which often cost less per gram.
- Don’t want to measure at all: pre-rolls come pre-portioned; see pre-roll sizes explained.
Ready to stock up? Browse flower in every size, including indica and sativa strains.
Frequently Asked Questions
How many grams are in an ounce of weed?
An ounce is about 28.35 grams, but cannabis is sold using 28 grams as an ounce.
How many grams is an eighth?
An eighth is 3.5 grams, one-eighth of a 28-gram ounce.
How many grams is a quarter or a half?
A quarter is 7 grams and a half is 14 grams.
How much weed can I carry in Ontario?
Adults 19 and older can carry up to 30 grams of dried cannabis, or the equivalent in other products, in public.
How many joints are in an eighth?
About 7 joints at half a gram each, or more if you roll smaller joints.
Weekday orders (Monday to Friday) placed before noon (12:00 PM EST) are delivered the same day; see our London, Ontario delivery page for details. Cannabis is for adults 19+ in Ontario.
Buy weed online in Canada · Same-day weed delivery in London, Ontario on weekday orders placed before noon (12:00 PM EST).
