How to measure your penis to choose the right chastity cage?

Whether you are new to the wonderful world of chastity or already wear a cage full time, it is vitally important that you know how to properly measure your private parts in order to wear a chastity cage that fits you. Failure to do so can put your comfort at risk, which can be avoided if you do it from the start!

At Chastifyme, we offer carefully selected devices that are standard, meaning they are produced in specific sizes and models. We are working on different solutions to offer you personalized models and sizes.

We sell chastity cages sorted on the basis of different criteria ensuring you high quality on all our products. Some come with multiple back ring sizes, allowing you to experiment to find the size that works best for you.

The goal of this guide is to keep you comfortably locked in for as long as you or your keyholder want.

Now that you know what a typical cage looks like, let's look at the four most important steps you need to take:

Back Ring - Internal Diameter. Cage Length - Length of your flaccid penis. Internal Cage Diameter – Internal width is related to the girth of your penis. Space between cage and rear ring.

How to measure the ring?


It is very important to choose the right size ring for you, as a ring that is too small can cause you some discomfort issues, including interruption of blood circulation or ability to urinate. If you opt for a ring that is too large, it will be much easier to break free and it will move too easily, which could cause friction burns as the ring rubs against your skin.

To find out your ring size, you will need the following:

  • A piece of thick string
  • A marker or pen. It will be used later to mark the string or cord.
  • A ruler .

We strongly recommend that you do not use a flat measuring tape, as it does not properly adapt to the contours of your penis.

After a good shower, surround your testicles and your flaccid penis with the rope, tighten the rope until you are completely comfortable with the sensation. Be careful to manage the tension power and not hurt yourself, the rope should absolutely not be painful.

  1. Place the length of the string along the ruler to get the measurement of the ring's circumference. To get a more accurate measurement, we recommend repeating this process at least twice and at different times of the day. Due to temperature fluctuations over the course of a day, we suggest taking one measurement in the morning, one at noon, and one in the evening.
  2. We will thus obtain 3 measurements which we can divide by 3 to obtain an average measurement! Divide this value by 3.14 and you will have the perfect ring size to wear. Choose the cage with the closest value.



423.5 mm/ 3 = 141 mm


The perfect ring size is as close as possible to 44.95mm

Types of rings


Circular ring

This is the most common type of ring. It's a simple circle - some have an opening at the top, some don't. To put it on, you must pass your penis and testicles through the ring.

Curved/oval ring

Similar to the circular ring that has no opening and you pass your genitals through the hole to put it on, but the shape of these rings makes them slightly longer, so there is a little more room at the bottom. This shape provides more comfort.

How to measure the cage tube?

It's very easy! We have already taken the measurement of the back ring. Now we will measure the circumference of your penis.

Again, this action should be taken when you are completely limp, so relax, focus on something else that won't excite you, and follow these instructions:

  1. Cut a length of string and wrap it around your penis at its thickest point. We recommend doing this about halfway up your penis.
  2. Mark the string with your pen.
  3. Place the length of the string against your ruler to get the circumference.
  4. Repeat twice at different times of the day. Add these measurements and divide them by 3 to get your average circumference. Divide this measurement by 3.14 to get the internal diameter of the cage. Note this number to choose your cage.

Lock type / Mechanism

Our chastity devices come with two types of lock and key: a sliding barrel lock or a padlock.

Sliding barrel locks allow the cage to have a lower profile (making it less visible when the kit is worn under clothing) and to be more discreet. These hidden padlocks don't make noise when you move because they don't rattle against the cage.

Padlocks are great if you like the aesthetic look of a padlock attached to your cage. The psychological impact of seeing the lock attached to the cage is also very important, not only for the submissives, but also for the key holders. They can, however, be annoying as they rattle around in the cage when you move, but this can be eliminated if you wrap an elastic band around it or secure it with tape.

You have questions ?

If you have any questions regarding your size, please do not hesitate to contact us via the contact page. By following this comprehensive guide correctly, you should be able to identify the right cage and ring size for you, but if you still need assistance, please feel free to send us a message and we will get back to you as soon as possible.

If you think we've missed something important in this size guide, please let us know. The chastity community is full of very knowledgeable people based on significant personal experience and we are very open to listening to ideas or suggestions that will help us improve this page.

Remember, take your time!

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Vanessa K

Vanessa K

Excellent article merci !



Super blog, merci! Comment mesurer un micro penis Maitresse Adéle?

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