Cock Ring Sizing Demystified: How to Find Your Perfect Fit

By Rachel Worthington / May 03, 2022

Cock rings are certainly no one-size-fits-all sex toy!

After all, we’re all different, and what works well for one penis-owner may not for another.

That’s why we’ve put together this guide to finding your perfectly-sized cock ring.

In five steps, you can measure yourself and know exactly what size cock ring to look for, either a big cock ring or a small cock ring (or medium-sized, of course).

How to Measure for a Cock Ring

Materials You’ll Need: string, ruler/tape measure, marker.

It’s best to use a string rather than wrapping a tape measure directly around your penis. The measurements for your cock ring sizing will be more accurate and precise, and the whole process will be a lot less awkward!

Step 1: Decide where you want to wear the cock ring, as this will affect where you measure. The most common way is to wear it around the penis, behind the testicles, but you can also wear one on your shaft in front of the testicles, or even around the glans near the tip of the penis.

Step 2: Start off with a flaccid penis. Wrap the string around where you’ll wear your cock ring (e.g. around your penis, behind the testicles or in front) . It should feel quite snug, but not uncomfortable or painful. You should be able to just about fit a finger between the string and your skin.

Step 3: Make a mark on both sides of the string where they meet. It’s easier to have some string left over on both ends and make a mark on both sides, rather than trying to measure where one end of the string meets the other side.

Step 4: Measure the distance between the two marks with a ruler or tape measure. This will give you the circumference of your ideal size of cock ring.

Step 5: Now do the same thing with an erect penis. This time, the string should feel comfortably tight, and you shouldn’t be able to fit a finger in between the string and your skin. Mark the string and then measure the distance between the marks. 

My Measurements Don’t Match, Help!

Your two circumference measurements of your flaccid and erect penis should match (or, at least, be very similar). If they don’t, you have two options:

  1. Do your measurements again. This can be a good option if your measurements weren’t very similar. You might need to go a bit looser or tighter, but make sure that it doesn’t feel uncomfortable or painful.
  2. Take the average of the two measurements. This should give you a comfortable size to start off with.

Finding the Diameter

Some cock rings are measured by circumference, while others go by the diameter.

To find the diameter, you’ll unfortunately have to do a bit of math. Just take the circumference measurement, and divide it by pi (that’s 3.142).

Or, take the easier route and go to this website that will calculate it for you!

Adjustable Cock Rings

The above method works well for sizing all cock rings, especially those made of stiffer materials like metal cock rings or silicone cock rings.

However, those are not your only option!

There are a whole host of cock rings available these days, including many with adjustable sizes.

Adjustable cock rings are an ideal solution for first time cock ring-wearers, as well as those who aren’t sure about their size.

There are a couple of different types, including:

Lasso-Style Cock Rings

These penis rings are super simple to use — just start off with it loose and place it where you want it to sit on your penis. Then slide the bead to make it tighter until you find a snug but comfortable fit. Lasso-style cock rings are beginner-friendly and versatile, too, so you can try out different positions until you find what suits you.

We Recommend: Doc Johnson Adjustable Silicone Cock Ring Set

Cock Rings with Snaps

Another option for versatility is a cock ring with adjustable snaps. Simply change up the tightness by switching up the number of snaps you use. These often come as leather cock rings (or faux leather), so you can really look and feel the part.

We Recommend: Spartacus 6-Snap Cock Ring

Stretchy Cock Rings

If you’re unsure about sizing or tightness, you could also opt for a super stretchy cock ring. These are easy to put on and will provide a snug fit without being overly constrictive, thanks to flexible and stretchy materials like TPE. Plus, there’s no danger of them coming loose mid-session.

We Recommend: BASICS Comfort Stretchy Cock Ring

Why Do You Need a Properly Sized Cock Ring?

The Good Bits

A cock ring’s main function is to stop blood flowing away from the penis when you’re erect.

That may sound a little scary, but it actually results in harder, longer-lasting erections!

That’s why they’re often a great aid for those dealing with erectile dysfunction. They can also make you more sensitive down there, and look bigger, too — truly a renaissance sex toy!

The thing is that these magical effects only really happen if your cock ring is the right size…

And the Bad Bits

If your cock ring isn’t tight enough, there just won’t be enough pressure on the blood vessels in the penis to restrict the blood from flowing away.

Plus, a penis ring that’s too big has a big chance of coming loose, or even falling off completely.

Not quite the sexy experience you were hoping for!

Then, there’s a cock ring that’s too tight.

While cock rings are totally safe to use when sized and used properly, wearing an overly tight cock ring can mean bad news for your penis. A penis ring that’s too tight can end up restricting too much blood flow, and can lead to penile strangulation.

Warning signs to look for when wearing a cock ring include:

  • Swelling
  • Numbness
  • Pain
  • Irritation
  • Changes in color or temperature

If you notice any of these, you should remove your cock ring immediately, which will allow your blood flow to return to normal. However, keep an eye on your penis, and seek medical advice if any symptoms persist.

However, you can easily catch a too-tight cock ring before it gets to a dangerous point. Cock rings are meant to be put on when flaccid, so that as you become erect, you can notice if your ring is uncomfortably tight before it becomes hard to take off.

If you want to use a ball stretches, testicle rings or a type of cock and ball torture toy this is not the guide to measure for that.