If you are purchasing a ring as a gift, please see our Gifting Guide.

We want you to Crown Your Jewels with confidence befitting a King.

King Rings’ fine 2mm size granularity is unprecedented in the metal c-rings market and makes a tailored fit experience possible. Our wide bands (20mm) make the rings fit more snug than thinner bands with the same inner diameter and experiencing this difference is important.

We recommend ALL NEW CUSTOMERS start with a set of Sizing Rings, this option also provides a discount to help you discover the luxury of our metal rings.

Whether you are considering rings of this type for the first time or are a seasoned collector, our 3D printed sizing rings are the perfect way to find your best fit and compare how each of the sizes performs for you.

Most other sellers ask you to measure at home and make your best guess. The cost of getting it wrong is generally not too high but, even if you are satisfied, you may always wonder if another size might have been better. We remove all the guess work and participate with you as you find what works best.

Measure to verify size range is appropriate for you.

Sizes sold here are good for 95% of men but you might want to confirm the range is appropriate for you before buying into our refined sizing process. The following guidance was initially developed when we sold fewer sizes with just 4mm size granularity. Now, with finer sizing, these techniques are not precise enough to pinpoint a single size but work very well for range estimation.

COCK RINGS (44-58mm)

Sizing Guide Header

Our signature rings fit around the base of your penis behind the balls. It is important while measuring that you are warm (the boys hanging loosely) and flaccid.

Measure And Mark: While flaccid, use a string, fabric ribbon, or tailor tape and wrap it around the base of your penis behind your scrotum to get a measurement of circumference. This should be a gentle wrap, firmly against your skin but not squeezing flesh into any wrinkles. Mark the overlap, straighten out the ribbon, and measure between your two marks in millimeters or inches. Hopefully, you are within – or close to the margins of – the following range: 170mm to 240mm OR 6 5/8″ to 9 1/2″.

Simulate With Paper: Easily construct a paper ring which closely mimics the diameter and band width of our signature Tungsten Carbide rings. It wraps around your shaft, takes care of the measurement, and removes easily. Download the template with full instructions here: King Rings Sizing Ruler

GLANS RINGS (24-32mm)

Glans rings fit on the shaft of the penis, just behind the head (glans), and are a bit trickier to measure. Unlike a cock ring, which is held in place by the scrotum, a glans ring is held in place almost exclusively by its grip just behind the edge (corona) of the penis head. To fit properly, the glans ring should be loose enough to allow your penis to expand when erect, yet small enough to not slip past the corona when you are flaccid.

Measure And Mark: While flaccid, use a string, fabric ribbon, or tailor tape and wrap it around the shaft of your penis just behind the head to get a measurement of circumference. This should be a gentle wrap, firmly against your skin but not constricting. Mark the overlap, straighten out the ribbon, and measure between your two marks in millimeters or inches. Hopefully, you are within – or close to the margins of – the following range: 95mm to 130mm OR 3 3/4″ to 5 1/8″.

Other options and personalized help are available

In addition to these preparatory steps, you have the option to add sizing ring singles during checkout. This permits you to test the size you ordered before unsealing your high value ring (see our Return Policy) but you won’t have any benefit of comparison with other sizes.

If there is anything more we can do to reassure your size selection please let us know.

21 Responses

  1. Avatar
    • Avatar
      Scott King

      Hi Frank, 1.75 inches = 44.45 mm. All of our product pages have a quick metric to empirical conversion table but, if you want to do your own, Google can help. Try searching “1.75 inches = ? mm” and the answer pops right up.

      With a 20mm wide band, our rings tend to fit more snug that thinner bands with the same inner diameter. At the moment, 46mm is our smallest size but you might find it to be a great fit. A Sizing Ring alongside your new Tungsten ring is a great way to confirm.

  2. Avatar
    Collin K

    Tried the paper sizing ring and the ends of the ‘ruler’ barely touched!
    Did I do something wrong? Do you have larger sizes?

    • Avatar
      Scott King

      Hi Collin, do you have any prior experience with c-rings? The paper ring is a valid way to test but requires more than just a gentle wrap around, functional rings have some squeeze to them and that’s what you need with the paper ring as well.

      If you measure with a ribbon or string (more of a gentle wrap) and then calculate, the squeeze factor is built into the equation with a 20% reduction in circumference.

      We really recommend going the route of getting some Sizing Rings, this takes out any guess work and they are less than free … we double your money when you buy an actual metal ring from us.

  3. Avatar

    Hi Scott
    Did the measurements as described above and worked it out to 57.57mm
    Now I repeated the measurement when everything was excited and came out at 66.24mm. I’m a little concerned that the largest ring (58mm) may be too restricting?
    Not looking to take my ball pein hammer to bed and trusting my girlfriend to be a good shot.
    I have ordered sizing rings though.

    • Avatar
      Scott King

      Hi Stuart – You were right to order the sizing rings as they take all the guess work out of sizing and are the best way to ensure a great fit. It sounds like you will be on the large side of the range and the plastic rings will help confirm that. You will find some helpful advice in the box with your sizing rings. Please contact me directly if you need any additional assistance.

  4. Avatar

    I have a question in terms of sizing: If we are familiar with the size of c-ring that we usually wear but still want to try the sizing rings to see if there’s another happy fit, do you suggest we start choosing the rings at the size we currently wear and up from there or give a little wiggle room by starting with a size smaller then our current size and then a size bigger?

    • Avatar
      Scott King

      If you already have a known-comfortable size you might still discover King Ring’s rings fit a bit differently. The width of our bands makes them fit more snug than narrower bands with the same inner diameter and we offer 2mm size granularity which is very uncommon for metal rings.

      We recommend picking a Sizing Rings set that has your known-good size right in the middle, with one or two sizes above and below. When you get the rings, start with the largest size and work your way down until you find a size that is too small. That’s not your ring, the next larger one is.

  5. Avatar

    What would be the best way to find a good fit if the size difference between my soft and hard penis is quite significant. What would be the best way to have a good fit while soft but not prevent blood circulation while erect?

    • Avatar
      Scott King

      Many men – self included – prefer different sizes for different uses. You may find that you prefer a lesser size for casual wear, that’s pretty normal. One of the many benefits of our rings are their 2mm size granularity which really makes it possible to fine-tune your ring experience. With a full set of our sizing rings, it is very easy to find and try out your preferred ring size(s).

  6. Avatar

    Hey Scott,
    I done the Measure And Mark technique. I’m in rage with 210mm. But I don’t know how to calculate the right size now. I was guessing that I’m measuring the circumference. So I plug the number in an circular calculator. With an 210 circumference i got an 66.8 in diameter. This doesn’t seem right. I don’t believe my calculation was wrong. I check it several times. What did I wrong?

    • Avatar
      Scott King

      Hi Sam – I am happy to hear you were successful in measuring yourself and discovered you are within our size range, that’s really all you need to do – the next step is to order a set of Sizing Rings.

      Measuring is a blunt tool and can approximate a size but it’s near impossible to determine your best fit this way. Our sizes differ by 2mm – the width of a grain of rice – and personally testing out each size yourself is invaluable. Do not skip the sizing rings.

      Regarding calculation of ring size from measurement (a step this article does not advise), I’ll satisfy your curiosity. Your calculation ignored the requisite squeeze factor which we estimate to be about 20% of total circumference. In your case: (210*0.80)/3.14 = 53.5mm ring size. Based on experience, I would say you are a 52mm or less. The sizing rings will confirm.

  7. Avatar

    1st time buying a metal ring. I’m fine purchasing the sizing ring kit however my string measurement was 10.5” which I believe is outside your range. You say close to 9.5” max. Just wondering if an inch over is close or am I out of luck. Thanks

    • Avatar
      Scott King

      We have learned from doing this that the string measure technique is rather unreliable on its own, largely due to variation each man introduces to the process. An inch outside our suggested range is likely within the margin for error and I would encourage you to try the sizing rings anyway.

      That said, the suggested range is for 44-58mm rings and, at the time of this writing, Woody is available in a 64mm size. We can include an appropriate sizing ring with your purchase of a set – on request.

  8. Avatar

    I’m confused at your usage of millimeters in measuring and then measured size of the rings themselves. I used a tailor’s tape measure and I sit at about 8 1/4 inches in circumference which equals out to 209.55mm. But then the largest ring is stated to be 58. For the Ring itself are you speaking of it’s diameter? At which point my numbers still don’t match up to fitting anything, as the calculation to diameter is 66.7 mm. So I’m rather confused by you saying a max of 240mm.

    • Avatar
      Scott King

      KingRings.com no longer provides “measure and calculate” type advice (we used to) because it proved to be too unreliable. Instead, our sizing guide suggests an appropriate circumferential range of 6 5/8” to 9 1/2″, which you are in! Our sizing rings do all the work for you and are also an excellent proxy for the fit and feel of our metal rings.

      That said, using your measurement and our old method of calculation, we get 53mm which is well within our size range. The thing you missed was the squeeze factor, the rings have to be smaller than what you measured in order for them to stay on. Here is our calculation with a 20% reduction in circumference to account for squeeze.

      (209.5mm * 0.8) / 3.14 = 53.4mm

      Try this, take your tailor tape and wrap it around the based of your penis – behind the balls – and pull the loop closed until the measurement shows 6 5/8 inches. This approximated the tightness of a 53mm ring.

  9. Avatar

    Sooo… i might be fully blank and asking the obvious… But can a gland ring be used when you are uncut? I guess the answer is no right? =(

    • Avatar
      Scott King

      We have heard reports with mixed results and highly recommend sizing rings, they have the same dimensions as our metal rings and are very good for judging this type of thing.

  10. Avatar
    Jason F

    Can you wear the sizing rings all day once you find the size you like? And how long do the sizing rings last?

    • Avatar
      Scott A

      Jason, I highly recommend you wear the sizing rings all day, as much as possible. I wore mine for 3 days before jumping in the king ring pool. I would suggest as far as a gland ring, buying one size smaller than the plastic sizing ring. The tungsten is much heavier and swings and sways much more than the plastic. I fit a 32 perfect in the sizing ring, but prefer a 30 for everyday wear. This is the same for the cock rings. I fit a 52 great, but my next one will be a 48 or 50 because of the weight of the ring. Hope this helps. If you’re on the fence, I can tell you that you won’t be disappointed!

    • Avatar
      Scott King

      Our sizing rings are purpose made to be disposable, we use biodegradable plastic and they are mostly hollow with thin walls. Can they be worn all day like our metal rings, yes. Will they last very long, probably – if you clean and dry them after use and are careful not to physically damage them (like step on them). As a tool to discover your best fit, they will exceed your expectations. As a stand-alone product, you should set your expectations very low. At the listed price, you would be overpaying if your only goal is to acquire a plastic cock ring.

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