How Many Grams in an Eighth? Cannabis Weights from a Gram to an Ounce

An eighth of cannabis is 3.5 grams. The name comes from the ounce: an eighth is one-eighth of an ounce, and since an ounce is 28.35 grams, an exact eighth works out to about 3.54 grams. Dispensaries round that down to 3.5 grams on the label.

Eighths are one of the most common flower sizes on any dispensary menu, so it helps to know how they compare to everything else. Here’s every common cannabis weight, from a single gram to a full ounce, plus a size you’ll only see on Ohio shelves.

Cannabis Weights at a Glance

Size	Share of an ounce	Grams on the label	Exact grams
Gram	1/28	1 g	1 g
Tenth (Ohio)	1/10	2.83 g	2.83 g
Eighth	1/8	3.5 g	3.54 g
Quarter	1/4	7 g	7.09 g
Half ounce	1/2	14 g	14.17 g
Ounce	1	28 g	28.35 g

Two eighths make a quarter, two quarters make a half ounce, and eight eighths make an ounce.

What Is an Eighth of Weed?

An eighth is 3.5 grams of flower, sold sealed in a jar or pouch with the net weight printed on the label. Depending on how dense the buds are, that’s usually a few medium buds or a handful of smaller ones. Dense flower looks smaller at the same weight; fluffy flower looks bigger. The weight on the label is what counts, not how full the jar looks.

You’ll also hear an eighth called an “eighth-ounce” or just “an 8th” on menus. It’s a popular size because it lets you try a strain without committing to a larger amount. Not sure how to size up the flower itself? Here’s how to judge cannabis flower quality.

Why Ohio Menus List 2.83 Grams

If you shop in Ohio, you’ve probably seen jars labeled 2.83 grams. That’s a tenth of an ounce. Ohio’s medical marijuana rules count flower in “whole day units,” and one day unit of plant material is 2.83 grams. Many Ohio cultivators package flower to match, so you’ll see 2.83-gram jars alongside 3.5-gram eighths.

A 2.83-gram jar is not an eighth. It holds about 0.7 grams less flower. When you compare products on an Ohio menu, check the gram weight on each listing rather than the size name. For more on what each menu field means, see how to read an Ohio dispensary menu.

What Is a Quarter of Weed?

A quarter is a quarter of an ounce: 7 grams, or two eighths. The exact figure is 7.09 grams, and labels round it to 7. Quarters sit between the everyday eighth and the bigger half-ounce and ounce sizes.

How Many Grams in an Ounce of Weed?

An ounce of weed is 28 grams on the label (28.35 grams exactly). That’s eight eighths or four quarters. A half ounce is 14 grams.

The gap between 28 and 28.35 is why the rounded sizes don’t add up perfectly. Eight 3.5-gram eighths come to 28 grams, which matches the label, even though a true ounce is a little heavier.

How Many Grams in a Quarter Pound?

A quarter pound, often shortened to “QP,” is 4 ounces, or about 113 grams (113.4 grams exactly). That’s four ounces, 16 quarters or 32 eighths. You won’t find quarter pounds on a dispensary menu: the amount is well beyond what state rules let one person buy or carry, so it’s a measurement you’ll mostly hear from growers and wholesalers rather than at the counter.

How to Tell How Much Flower You’re Buying

• Read the net weight. Every jar, pouch and pre-roll pack lists its weight in grams. That number is the amount of flower inside. Here’s how to read a cannabis label from top to bottom.
• Don’t judge by THC percentage. THC percentage describes the flower, not how much of it you get. A 3.5-gram jar weighs the same whatever its THC.
• Check pre-roll weights too. Pre-rolls are sold by weight, often 0.5 gram or 1 gram each. A five-pack of half-gram pre-rolls holds 2.5 grams.
• Compare sizes by gram, not by name. “Eighth,” “tenth” and “quarter” are shorthand. The gram weight is what lets you compare two products side by side.

How Much Flower Can You Buy at Once?

Purchase and possession limits are set by each state and are measured in ounces and grams, so knowing these conversions helps. Before buying larger amounts, check the current rules for Ohio possession and purchase limits or Maryland possession limits. If you’re visiting from another state, don’t carry cannabis across state lines.

Frequently Asked Questions

Is an eighth 3.5 grams or 3.54 grams?

Both. An exact eighth of an ounce is 3.54 grams; dispensaries label and sell it as 3.5 grams.

Is a 2.83-gram jar an eighth?

No. 2.83 grams is a tenth of an ounce, a size common in Ohio. An eighth is 3.5 grams.

How many eighths are in an ounce?

Eight. Eight 3.5-gram eighths make 28 grams.

How many grams are in a quarter?

Seven grams, or two eighths.

How many grams are in a half ounce?

Fourteen grams.

How many grams are in a quarter pound?

About 113 grams, or 4 ounces.

Shop Flower at Bloom

Now that you know your grams from your eighths, browse Bloom’s flower menu and filter by size. Every listing shows its weight in grams, and you can order ahead for pickup at any Bloom store in Ohio or Maryland.

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