When it comes to enhancing pleasure and confidence, finding the right cock ring size makes all the difference. A ring that fits perfectly can heighten sensation and help you stay harder for longer — but the wrong size can be uncomfortable or even unsafe.
Here’s your complete, step-by-step guide on how to measure for a cock ring so you get the perfect fit every time.
How to Measure for a Cock Ring (Step-by-Step Guide)
Measuring for a cock ring isn’t complicated – but doing it carefully matters.
- Measure when you’re both flaccid and erect
- Use a string or soft measuring tape to find your circumference
- Convert that to a ring size in millimetres
- Choose a size that’s snug but not tight
This ensures your cock ring is easy to put on, comfortable during play, and safe to remove afterward.
Step 1: Decide Where the Ring Will Sit
Cock rings can be worn in different ways, and where you wear it affects the size you’ll need.
Behind the balls and penis (base of the shaft):
This is the most common placement. It gives a stronger, fuller sensation but usually requires a slightly larger ring.
Around the shaft only:
This provides a lighter, more focused squeeze and usually needs a slightly smaller size.
Tip: Try both positions to see which feels best for your body and the experience you want.
Step 2: Measure Using String or Tape
You don’t need anything fancy — just a soft measuring tape or a piece of string.
- Wrap it around the base of your penis (or behind the balls if that’s your chosen spot).
- Keep it snug but not tight — it should feel comfortable.
- If you’re using string, mark where it meets and measure that length with a ruler.
The measurement you get is your circumference.
Step 3: Convert Circumference to Ring Size
Cock rings are measured in millimetres (mm) or inches (diameter).
To convert your circumference into diameter:
Diameter = Circumference ÷ π (3.14)
Example:
If your circumference is 140 mm → 140 ÷ 3.14 ≈ 45 mm diameter
For beginners, it’s best to choose a ring 1–2 mm larger than your exact size — easier to put on and remove while still snug.
Step 4: Flaccid vs. Erect Sizing Explained
This part really matters — especially if you’re using metal or other non-stretch rings.
- Measure flaccid: Ensures the ring slides on comfortably.
- Measure erect: Ensures it won’t become too tight during use.
Silicone or stretchable rings are more forgiving, while metal or rigid rings need a precise fit — firm but not restrictive.
Pro Tip: Measure twice — once flaccid, once erect — for maximum comfort and safety.
Step 5: How to Put On and Remove a Cock Ring Safely
- Start while flaccid or semi-erect.
- Apply a water-based lube to the area and the inside of the ring.
- If wearing behind the balls, gently insert one testicle at a time, then the penis.
- When removing, reverse the process slowly — never force it.
If it feels too tight, painful, or difficult to remove, stop immediately and switch to a larger size.
What Size Cock Ring Should I Get?
Here’s a quick sizing guide to help you start:
| Circumference (mm) | Approx. Diameter | Recommended Fit |
|---|---|---|
| 120 mm | 38 mm | Snug fit |
| 130 mm | 41 mm | Average fit |
| 140 mm | 45 mm | Slightly looser fit |
| 150 mm + | 48–50 mm + | Larger / behind-balls fit |
Always choose comfort over tightness — your ring should feel supportive, not restrictive.
Final Word: Pleasure, Safety & Confidence
Getting the right size cock ring isn’t just about comfort — it’s about enhancing pleasure safely and confidently.
Silicone rings are perfect for beginners — stretchy and forgiving.
Metal rings offer a firmer, longer-lasting feel — but sizing must be exact.
Always measure both flaccid and erect to find your ideal fit.
At Manatomy, we offer body-safe, inclusive cock rings with discreet delivery Australia-wide, so you can explore confidently and comfortably — on your own terms.
Ready to find your perfect fit?
Explore our full range of cock rings here.