Choosing the right size for your chastity cage is crucial for comfort, safety, and the best experience. A well-fitted device prevents unwanted movement, minimises discomfort, and allows for safe long-term wear.
This guide combines the most reliable sizing methods used by leading chastity manufacturers, so you can confidently find the perfect fit for your body.
Understand the Components of a Chastity Device
A chastity device has two key parts:
- Base Ring – fits around the penis and behind the testicles
- Cage Tube – covers the penis shaft and attaches to the ring
Each part must fit correctly for the device to be safe and comfortable.
Prepare for Accurate Measurements
To ensure your measurements are correct:
- Measure in a relaxed, completely flaccid state
- Avoid hot showers or very cold environments when measuring
- Use a soft string, fabric strip, or flexible ruler along with a standard ruler or tape measure (avoid elastic strings that stretch)
Measure for the Base Ring (Diameter)
- Take a 30 cm (12-inch) piece of non-elastic string.
- Wrap it behind your scrotum and around the base of your penis.
- Pull the string snug — firm but not tight enough to restrict blood flow. Leave it in place for about 5 minutes to ensure comfort.
- Mark where the string meets, then measure the length.
- Use the chart below to find your correct ring size:
| String Length (mm) | String Length (inches) | Ring Diameter (mm) |
|---|---|---|
| 110 – 118 | 4.33 – 4.67 | Ø 36 |
| 119 – 132 | 4.68 – 5.20 | Ø 40 |
| 133 – 148 | 5.21 – 5.82 | Ø 45 (most common) |
| 149 – 163 | 5.83 – 6.41 | Ø 50 |
| 164 – 180 | 6.42 – 7.03 | Ø 55 |
| 181 – 195 | 7.02 – 7.60 | Ø 60 |
Tip: Most beginners start with 45 mm, but always rely on your actual measurement.
Measure for the Cage Length
- Measure from the base of your penis (against the pubic bone) to the tip of the penis head.
- Select a cage length that is ¼” to ½” (6–12 mm) shorter than your measurement. This ensures a snug fit without excess space for movement.
Comfort Note:
- For beginners, starting with a cage close to your full flaccid length often feels more natural and easier to wear for longer periods.
- Over time, as you become more comfortable with chastity, you may find that shorter cages reduce friction, making them more comfortable for long-term wear.
- Many experienced users eventually prefer shorter or flatter cages — some even like designs that gently push the penis back into the body for a discreet, secure fit.
Fit Check & Comfort Tips
- The device should feel snug but never painful.
- Watch for discolouration, numbness, or swelling — these are signs the device is too tight.
- Always test your device during the day first before committing to overnight or long-term wear.
Signs of Incorrect Sizing
| Problem | Likely Cause | Solution |
|---|---|---|
| Pain, numbness, or loss of circulation | Ring or cage too tight | Try one size up |
| Cage rotates or allows partial erections | Ring or cage too loose | Try one size down |
| Difficulty urinating or cleaning | Cage too short or too narrow | Opt for a slightly larger cage |
Personal Preference
This guide provides a safe starting point, but everyone’s body and preferences are different. Over time, you may find a tighter or shorter fit feels better.
The key is always to prioritise safety and comfort, especially for extended or continuous wear.