Choosing a Chastity Cage that Fits like a Glove: A Comprehensive Measuring Guide

If you're going to lock up your junk, you want to make sure you're doing it right. A poorly fitting chastity cage can cause discomfort, chafing or even injury so it's essential to choose a device that fits you perfectly. 

A chastity cage has four essential parts that work together to ensure that you're locked up safe and sound. These parts are the back ring, cage length, internal cage diameter, and ball trap gap. Each of these parts plays a crucial role in making sure you're comfortable and secure.

To help you choose a cage that fits like a glove, here is our comprehensive chastity cage measuring guide.

1. Measure for the Back Ring 

The back ring is the foundation of your chastity cage and fits around the base of your penis like a cock ring. Think of it as the start of your journey to a secure and comfortable chastity experience. You don't want the ring to be too tight as it will cut off your circulation and make your genitals turn purple. On the other hand, if the back ring is too loose, it will rub against your skin and cause friction burns. 

To measure for the back ring:

  • Choose a piece of non-stretchy string or cord of a similar thickness to the back ring.
  • Wrap it around the top of your penis, making sure it's tight but not too tight.
  • Wait for five minutes and check for any signs of swelling or discolouration which could indicate that your circulation is being blocked. 
  • Pee and check again. Trust us; you don't want to experience any discomfort when you're trying to go number one.
  • Tie a knot in the string and go about your day for 15-20 minutes, checking to make sure there's no discomfort or pain. 
  • Measure the length of the string. Don't worry if the measurements aren't exactly the same each time (It's just like making pancakes; the first one is always a little wonky!)
  • Repeat this process twice more, and take the average of the three lengths for a more accurate reading.
  • Check the availability of different chastity cages with different back ring sizes to find the one that fits you best. 
  • 2. Measure for the Cage Length

    The cage length is crucial because it ensures that you have enough space for your penile prisoner. Some people make the mistake of giving themselves a little extra length at the end of the chastity cage but this is cheating and won't give you the full locked-up feeling you're after. It's also important not to have a cage that's too large, as this can make it hard to urinate accurately through the open hole at the end. 

    To measure for the cage length:

  • Make sure you're completely flaccid. You want a chastity cage that is going to punish you for naughty thoughts and hard inches so don’t allow yourself any room for growth.
  • Stand up straight and measure from the base to the tip of your penis. 
  • Subtract 0.25 to 0.5 inches from that measurement (You want a snug but comfortable fit, not a loosey-goosey situation!)
  • Choose a cage length that matches your measurement. This is your chance to pick a cage that shows off your best feature.
  • 3. Measure for the Internal Cage Diameter 

    The internal cage diameter is the rock-hard sock for your cock. It's the part that surrounds your penis, determining how snugly your penis is held in place. You want a snug but not too tight to ensure your comfort and safety. 

    To measure for the internal cage diameter:

  • Again, make sure you're completely flaccid.
  • Stand up straight and wrap a non-stretchy string or cord around your penis at the thickest point. 
  • Mark the string and take the measurement.
  • Repeat this process twice later on during the day.
  • Take the average of the three measurements to determine your penis circumference. 
  • Dust off your old maths textbook and divide your penis circumference by 3.14 (pi) to determine your penis diameter. 
  • Choose a cage with an internal diameter as close as possible to your penis diameter for a snug fit.

  • 4. Choose the Right Ball Trap Gap

    The ball trap gap is the space between the cage and the back ring where your balls hang out. This gap is necessary to ensure comfort and prevent any pinching or rubbing of your skin. However, the size of the gap can make a big difference in your chastity experience.

    When choosing the right ball trap gap size, keep your personal preference and body type in mind. If you have a lot of skin around your sack with low-hanging balls, a smaller ball trap gap is better. This will keep everything snug and prevent any unnecessary movement. If, on the other hand, you have high-hanging balls, a wider gap will provide the necessary space for your testicles to hang comfortably.

    Remember, the ball trap gap is all about ensuring your comfort and preventing any painful pinching or rubbing. Take some time to figure out what works best for you and choose a cage that accommodates your unique anatomy.

    5. Consider the Chastity Cage Material

    When it comes to the material of your chastity cage, there are a few options to consider. The most common materials are plastic, silicone and metal with each material having its own unique features.


    If you're looking for a lightweight and budget-friendly option, a plastic or resin chastity cage is a great choice. Its versatility is another advantage as it comes in different colours and styles which lets you experiment and explore your creativity. However, it's not as durable as other materials and it may break or crack over time, especially if not cared for correctly.


    Silicone is another very popular option in the world of chastity cages. It's soft, flexible and comfortable making it ideal for long-term use. Silicone chastity cages mould to your body, giving you a snug and secure fit and is also easy to clean and maintain. However, keep in mind that silicone may not be as secure as a metal chastity cage.


    Metal chastity cages are often the preferred option for their durability and reliability. They're typically made of stainless steel which is known for its strength and resistance to wear and tear. Metal chastity cages are designed to last a lifetime if cared for properly, making them a worthwhile investment.

    Final Thoughts

    When it comes to choosing a chastity cage, you don't want to be caught with your pants down. By following our comprehensive measuring guide, you can ensure that your device fits you perfectly, providing a thrilling and pleasurable experience. So, whether you're a dom looking to control your sub's every move or a sub wanting to explore the limits of your pleasure, remember that when it comes to chastity cages, size definitely matters!