OK, there are 28 grams in an ounce. Question answered. But it’s not that simple; an ounce doesn’t weigh 28 grams at all.

Let’s break it down so we all know exactly what the score is.

Metric Vs. Imperial/American

Grams and ounces belong to completely unrelated systems of measurement: metric and Imperial. (“Imperial” is called “American” in the US).

Imperial/American is a base-12 system. Whereas good ol’ sensible European metric is base-10.

So, in metric terms, you can buy a kilo of cannabis and be pretty sure it’s 1000g. That 1000g breaks down neatly into 100’s, 10’s, 0.10’s, etc.  The systems’s designed to be simple and efficient. And it does its job most of the time.

Scientists everywhere prefer metric over Imperial. There’s even an “international prototype kilo” somewhere in France. It’s recalibrated every few years in case it’s lost some atoms to radioactive decay. That’s how precise the system is.

Imperial/American, on the other hand, is based on whimsy. Base-12 systems can be really useful. But this one’s constructed in a confusing way. People have made lots of tiny patchwork changes to it over hundreds of years. Metric was developed much later, to try to regulate the existing mess.

So, instead a system where everything’s in multiples of 10, we’ve a bunch of weird things like stones, pounds and ounces.

When Worlds Collide

In places where Imperial is still used, the system for buying and selling cannabis combines both! Bulk producers have no time for that crazy Imperial nonsense. They produce kilos. And they sell kilos. But here’s the ridiculous thing. The person why buys the kilo breaks it down into Imperial units! Ounces, or sometimes even “bars” and “half bars”. With a bar being 9 ounces and a half-bar 4.5 ounces. Crazy!

People at street level don’t usually want a whole ounce. They want a smaller piece of that ounce. Which is where “quarters”, “eighths” and “teenths” come in. To make it simple. An eighth is an eighth of an ounce, like the name implies. A quarter is obviously a quarter. And a teenth is a sixteenth of an ounce.

Going Down The Scales

One Ounce of Cannabis On A Scale

So how does all this work out in metric units?

Okay: a kilo gets broken down into ounces. For convenience, lots of people say that there are 36 ounces in a kilo. But, there ain’t. There are 35.274 ounces in a kilo. So if your contact gives you 36 ounces as a kilo, count yourself lucky!

A lot of people think that an ounce has 28 grams. But that ain’t true either. It’s close enough for simple transactions. But it’s not close enough for, say, firing a rocket into space. In fact, an ounce has 28.3495 grams. The more you know! Just try asking for the missing .3495 grams next time.

But if, like most folk, you’re resigned to there being only 28 grams in an ounce, it’s pretty simple from there on down. A quarter is 7 grams. An eighth is 3.5 grams. And a “teenth” is about 1.75 grams!

How Many Grams In An Ounce – An Explanation by Simon Moker

How Much Is A Gram Compared to An Ounce?

We hope that we’ve been able to answer all your questions, if not, make sure to check out our visual guide to find out more about grams, eight ounces, quarter ounces, half ounces and ounces.