Skip to content
How to Measure Bong Joint Size

How To Measure Glass Joint Size for your Bong Using a Penny

Measure the glass joint size has always been a daunting task until now.  With all the different angles, sizes, and genders it can get a little confusing. We have put together the simplest and easiest way to determine what size joint your bong is using just a penny. You don't have to worry about finding a ruler just follow the next few steps and you will know instantly what size joint you have.

Bong Joint Size Chart

Hopefully this picture was helpful for you in determining your joint size.  Main things you need to know:

  • The male joint slides into the female joint. 
  • Most people have either 14mm or 18mm. 
  • 10mm is pretty rare, its smaller than half of the penny.  

Good luck, and please share this post if you found it helpful.  

Here's How to Measure Bong Joint Size:

This is probably the simplest way to measure the bong joint size. For most bongs and dab rigs you only have to worry about two sizes: 14mm and 18mm. Here is a pic of how those look side by side.

measure bong joint size

As you can see in the picture above, the penny goes down about halfway on the 18mm female joint. The penny test is the easiest way to measure the glass joint, and determine what size your bong joint is. Got a penny lying around? Go ahead and try it out.

Here are the 14mm and 18mm Male Bowls that Will Fit Inside

14mm and 18mm Male Bowls

The 14mm male joint goes a little bit past the half way mark on the penny.  For bangers this is the most popular joint size.

A less common size is the 10mm, usually used on very small dab rigs. Here's how the 10mm male looks next to a penny.

10mm Male Joint Size

What Gender is My Bong Joint

This one is pretty simple, the male end slides into the female. 

If your joint is female, it will use the same size male accessories. 

If your joint is male, it will use the same size female accessories.

14 mm Female Joint with 14 mm Male Quartz Banger

Pictured above is the 14mm Female Joint with 14mm Male Quartz Banger

14mm Male Joint with a 14mm Female Banger

 Pictured above is the 14mm Male Joint with a 14mm Female Banger

Bong Joint Sizes

 In conclusion, whichever gender joint you have, it will use the opposite gender and same size for its parts. 

Good luck and we hope this guide really helped you get a good idea of joint sizes and how to measure them easily.

Previous article How Often Should You Change Bong Water? (you'd be surprised)