And technically, it's not 28.

No matter your strain or favorite way to enjoy weed, being able to answer, how many grams are in an ounce of weed is crucial. Whether you’re using a dispensary, delivery service, or some grey market way to get your favorite strain, converting between ounces to grams is a crucial skill for all smokers.

Before you make your next purchase, here’s what you need to know about grams to oz, and the imperial and metric systems more broadly.

How Many Grams in an Ounce, Answered

There are 28.34952 grams (g) in 1 ounce (oz). It doesn’t matter if you’re buying precious metals or cannabis, the answer will always stay the same.

In other words, 1 oz = 28.34952 g.

How to Convert Oz to Grams and Visa Versa

Converting ounces to grams is easy. Just multiple the oz value by 28.34952 and you have your answer. Want to go from grams to ounces? Simple: divide the number of gs by 28.34952 and you’ll get your answer every time.

Where Do These Measurements Come From?

Knowing how to answer, how many grams are in an ounce, means understanding how to convert between the imperial and metric systems of mass. More specifically, an ounce (oz) is an imperial unit of measurement for mass. By contrast, a gram (g) is a metric unit of mass.

The Imperial System

The imperial system dates back to 1824 in Great Britain. It includes the following units of length, volume, area, mass, and weight, common in Great Britain and the United States:

  • Foot (ft)
  • Mile (mi)
  • Acre
  • Gallon (gal)
  • Ounce (oz)
  • Pound (lb)

Additionally, one ounce is ​1⁄16 of a pound. This means that one pound is equal to 453.59237 g.

Another complicated conversion can be between ounces and pounds. Being able to answer how many ounces in a pound is just as crucial for people purchasing weed as knowing how many grams are in an ounce.

The Metric System

By contrast, the gram is a metric unit of mass. The metric system, also known as the International System of Units, was first officially adopted in France in the late 1700s, according to the U.S. Metric Association. It has since spread throughout Europe and much of the world.

Common metric units include:

  • Mass: Gram
  • Length: Metre
  • Time: Second

Converting from Grams to Ounces to Eighths

Now that you know how many grams are in an ounce, you should probably know how to convert between g, oz, and eighths.

An eight is the baseline unit for purchasing cannabis--especially in the grey market. More specifically, an eight is an eighth of an ounce. This means that an eighth is 3.5437 grams, technically, though most people who sell weed round it down to 3.5 g.

In other words:

  • 1 eighth = ⅛ of an oz
  • 1 eighth = 3.5437 g

How Many Grams in an Ounce, Reviewed

Now you know how to convert grams to ounces, but how much weed this is really may not be clear. For most people, an eighth is enough weed to last a week or two, so an eighth could easily last a casual smoker over a month.

So how much should you buy? That all depends on how much you smoke, the density of the bud you’re buying, and whether or not your friends are coming over. A quarter--meaning ¼ of an ounce--is another common unit.

¼ oz = 7.08738 g

Now that you know how many grams are in an ounce of weed, you’ll know exactly how much you should be getting for each purchase--no matter where you’re getting it. Also wondering how much is a pound of weed? Keep in mind that the cost of weed varies across the country.