How many grams in an ounce of weed?

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Reviewed by Lesley Nickus, thanks to our friends at weedmaps for the wonderful article

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Weed is measured in all sorts of ways, which is a clear win for the consumer. If you’re just looking to try something new without committing to a huge quantity of weed, you can buy something small, like a preroll. If you look up at the menu and notice that they just got in your all-time favorite strain, you can stock up on flower and buy in larger quantities — like an ounce.

An ounce is a solid amount of weed. People who buy in ounces are either regular cannabis consumers or so in love with a particular flower, they want to make sure they stock up before the dispensary runs out.

But how much is an ounce? How is it measured? And how many grams are in an ounce of weed?

Breakdown of weed measurements

Before we jump into how many grams are in an ounce of weed, let’s take a broader look at how weed is measured.

While large quantities of weeds can be measured in pounds or kilos, from a consumer standpoint, most cannabis is measured in smaller units. And all of those units? They’re based around the ounce.

An ounce is a unit of weight that’s the equivalent to one sixteenth of a pound. You can walk into a dispensary and buy an ounce of weed, but that’s not the only way to measure. Fractions of an ounce are also popular units for measuring and selling cannabis.

weed scale eighth 3.5 grams
When you buy flower at a dispensary, it’s often priced in a few major units, including an eighth, a quarter, and a half.

When you buy flower at a dispensary, it’s often priced in a few major units, including an eighth, a quarter, and a half—all of which represent the weed’s weight relevant to a full ounce. So, an eighth is ⅛ an ounce of weed, a quarter is ¼ an ounce of weed, and a half is ½ an ounce of weed (and, of course, an ounce is an ounce).

In addition to buying weed by the ounce (or by a fraction of an ounce), there’s also a smaller unit for measuring weed — the gram.

What is a gram?

There are a variety of reasons cannabis consumers might want to purchase weed in smaller quantities. 

For example, maybe they want to sample a strain they’ve never tried before. Or maybe they consume cannabis infrequently and only want a small amount to keep on hand. Whatever the reason, for those consumers, grams are the perfect unit of measure.

A gram is “metric unit of mass equal to one thousandth of a kilogram”, and it’s one of the most common ways to measure cannabis. While weighing out weed in grams is the obvious choice for a consumer who wants to purchase a small quantity of cannabis, the gram unit can also be used to measure larger quantities — and that includes the ounce.

How many grams are in an ounce of weed?

Because there’s such a huge variety in the amount of weed people buy at a dispensary, most dispensaries use gram scales to weigh out their cannabis — which is why, if you want to buy an ounce, it’s important to understand how many grams are in an ounce of weed.

rosin tech weed nugs
There are approximately 28 grams in an ounce of weed.

If we’re being technical, an ounce of weed is equal to 28.3495 grams. But in most cases, that gets rounded down to the nearest whole number. So, to tackle the question “how many grams are in an ounce of weed?” the answer is 28.

You can also use that number to determine how many grams are in smaller weed measuring units; for example, if an eighth of weed is ⅛ of an ounce, you would just divide the total number of grams in an ounce (28) by eight to figure out how many grams make up an eighth. 28 divided by 8? That’s 3.5 — so there are 3.5 grams of weed in an eighth.

Here’s the breakdown for how many grams are in the different quantities of weed:

  • 1 eighth = ⅛-ounce = 3.5 grams
  • 1 quarter = ¼-ounce = 7 grams
  • 1 half = ½-ounce = 14 grams
  • 1 ounce = 28 grams
  • 1 pound = 16 ounces = 448 grams

How to determine if there are 28 grams in an ounce of weed

Now that we’ve covered how many grams are in an ounce of weed, let’s talk about how to determine if the ounce you’re dealing with weighs the full 28 grams.

Actually, let’s first talk about how not to determine if there is 28 grams in an ounce of weed and that’s by eyeballing it.

There is far too wide a variety in flower shape, size, and density to be able to accurately determine a gram of cannabis — and when you multiply those variables times 28, it becomes even more impossible to determine the weight of an ounce by sight. If you want to accurately measure how many grams are in an ounce, there’s only one way to do it — and that’s with a scale.

When you buy weed at a dispensary, your budtender should weigh out the flower in front of you; that way, you can see the number on the scale for yourself — and you can know exactly how many grams are in that ounce before you get your weed packaged up and walk out the door. 

If you want to measure for yourself, you can also invest in a personal scale to keep at home; just make sure the scale is designed to weigh small amounts. 

Another option is to download a scale app on your smartphone. Just be aware they’re not as accurate as a physical scale, so if you’re concerned with knowing exactly how many grams are in your ounce of weed, this isn’t going to be your best bet.

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