Cock Ring Sizing Guide:
How to Measure for a Cock Ring

Step 2: Wrap the String Around Your Flaccid Penis

Grab your string and wrap it snugly around the part of your soft pecker where you plan to wear your cock ring. The fit should be tight enough to stay put, but not so tight that it feels uncomfortable or painful. A good rule of thumb? You should be able to just barely squeeze a single finger between the string and your skin.

Step 3: Mark the String and Measure It

Once the string is in place, mark where the two ends meet. Lay the string flat next to a ruler and measure the distance between the marks—this number is your ideal cock ring circumference.

If the seller uses diameter instead of circumference for sizing, don’t panic! No need for a geometry degree—just divide your circumference by 3.14159 (yes, pi), and voilà! You’ve got your perfect cock ring diameter.

Step 4: Repeat Steps 2 and 3 on Your Erect Penis

Now that your dingaling is standing at attention, repeat the string-measuring process (grab a fresh piece of string to avoid confusion) on the same spot you measured earlier. In most cases, the circumference of your erect and flaccid penis will be pretty close. If the numbers are wildly different, something’s off—you’ll need to start over. If you’re still seeing major discrepancies after a second try, just average the measurements from your hard and soft states. That’ll give you a happy medium.