How to Measure for a Chastity Cage (Locktober Fit Guide)

Bad measurements are the fastest way to quit Locktober. Learning how to measure for a chastity cage—calmly, flaccid, and more than once—saves returns, skin, and the month.

What you’re measuring

• Base ring size: the ring behind the scrotum that anchors the device

• Cage / tube length: usually based on flaccid length

• Internal diameter: room for the shaft without clamp

How to measure the base ring

1. Stand at room temperature; don’t measure after a hot shower if you run large when warm—or measure both and compare.

2. Pull the scrotum gently down and wrap a soft measuring tape or string behind the balls at the base of the penis.

3. Note circumference, then convert to diameter (circumference ÷ π) if your brand sells ring diameters.

4. If between sizes, many beginners do better slightly larger than painfully tight.

A ring that must be forced on is a red flag. A ring that slips off with zero resistance is also wrong—aim for snug security without numbness.

How to measure cage length

Measure flaccid length from the base (pubic bone contact) to the tip along the topside. Do not size the cage to erect length for everyday Locktober wear—extra empty length causes rubbing and “pull,” while too-short tubes cause head pressure.

Community fit reports often cluster around mid-range ring diameters and moderate tube lengths, but averages are not your body. Treat charts as starting points, then validate with trial wear.

Common Locktober sizing mistakes

• Measuring erect or partially erect

• Choosing the smallest cage for aesthetics

• Ignoring overnight fit (sleep changes everything)

• Assuming one ring size fits every brand’s geometry

• Skipping break-in and jumping to 24/7

Fit checks after you put it on

Within the first hour, you should be able to:

• Walk and sit without sharp pinching

• See normal color (no blue/purple alarm signs)

• Feel sensation without pins-and-needles numbness

• Urinate without chaotic spray that soaks the device endlessly (some learning curve is normal)

Use the interactive CB-X chastity sizing guide on Locktober.com, then confirm with real wear time before October.

When to size up or change styles

Size up the ring for cold/numb feelings, deep indent marks that last, or testicular pain. Consider a different tube length if you’re constantly pushing against the end or swimming in empty space. Material swaps (lighter plastic vs steel) can also change perceived fit.

Next steps

Once measurements look solid, pick a beginner-friendly device from Best Chastity Cage for Locktober Beginners and follow How to Prepare for Locktober. Shop sized options in the store.