RING SIZE Tips & Tricks: Buy a plastic ring-sizing gauge or follow these easy steps to know your ring size.

RING SIZE Tips & Tricks: Buy a plastic ring-sizing gauge or follow these easy steps to know your ring size.



In stock

Whoa! You can't buy your own item.

Nice choice! Enjoy free shipping to the US when you spend $35+ at this shop.

  • Materials: plastic, plastique

Here are a few easy steps to help you figure out your ring size:

The BEST way to know your size is to go at your local jewelry shop to try different sizes. Try a ring about the same width as the ring you want to buy online.

You can buy a plastic ring-sizing gauge. You only need to add this item to your cart and proceed to checkout to receive it by the mail.

If you buy a ring sizing gauge and you want to order a ring band 5mm or wider you must add ½ size to get the good size.
(Example a size 6 with a plastic gauge will equal to a size 6 on a 3mm wide ring, but a 6 1/5 size on a 5mm ring band.)

If you already have a ring that is the right size for you, it is possible to estimate your ring size from it. The ring must be about the same width as the one you want to purchase.
If the ring you have is thinner than the ring you want to order; add ½ size and vice-versa.
(Example a size 6 on a thin ring will equal to a size 6 on a 3mm wide ring, but a 6 1/5 size on a 5mm or wider ring band.)

This method is no the best way to know your ring size, but it does help a lot if every step is well executed. It is usually close to ¼ to ½ size.
It is a good way to get the ring size of someone else for a surprise gift.

You will need a paper, a fine pen or pencil and a rule with millimeters.

1. Place the ring on a paper sheet
2. Trace the interior border with a fine pencil
3. Measure the diameter* (∅) of that circle OUTSIDE the lines.

*The diameter (∅) represents a line connecting the largest points of the circle, passing trough the center.

The measure you get outside the circle should be the same has inside the ring.
Here are the different sizes matching their diameter (∅) inside.

Size 4.00 = 14.78 mm ∅
Size 4.25 = 15.00 mm ∅
Size 4.50 = 15.28 mm ∅
Size 4.75 = 15.40 mm ∅

Size 5.00 = 15.72 mm ∅
Size 5.25 = 15.80 mm ∅
Size 5.50 = 16.16 mm ∅
Size 5.75 = 16.30 mm ∅

Size 6.00 = 16.58 mm ∅
Size 6.25 = 16,70 mm ∅
Size 6.50 = 17.04 mm ∅
Size 6.75 = 17.10 mm ∅

Size 7.00 = 17.30 mm ∅
Size 7.25 = 17.50 mm ∅
Size 7.50 = 17.70 mm ∅
Size 7.75 = 17.90 mm ∅

Size 8.00 = 18.23 mm ∅
Size 8.25 = 18.40 mm ∅
Size 8.50 = 18.59 mm ∅
Size 8.75 = 18.75 mm ∅

Size 9.00 = 18.90 mm ∅
Size 9.25 = 19.20 mm ∅
Size 9.50 = 19.44 mm ∅
Size 9.75 = 19.60 mm ∅

Size 10.00 = 19.88 mm ∅
Size 10.25 = 20.00 mm ∅
Size 10.50 = 20.27 mm ∅
Size 10.75 = 20.40 mm ∅

Size 11.00 = 20.60 mm ∅
Size 11.25 = 20.80 mm ∅
Size 11.50 = 21.13 mm ∅
Size 11.75 = 21.20 mm ∅

Size 12.00 = 21.45 mm ∅
Size 12.25 = 21.60 mm ∅
Size 12.50 = 21.80 mm ∅
Size 12.75 = 22.00 mm ∅

Size 13.00 = 22.30 mm ∅
Size 13.25 = 22.40 mm ∅
Size 13.50 = 22.60 mm ∅
Size 13.75 = 22.80 mm ∅

Size 14.00 = 23.14 mm ∅
Size 14.25 = 23.30 mm ∅
Size 14.50 = 23.50 mm ∅
Size 14.75 = 23.70 mm ∅

Size 15.00 = 23.88 mm ∅

I use US Sizes, which are mostly used in USA and Canada.

If you order a ring but the size doesn’t fit, it is always possible to make a ring size adjustment.
You can visit your local jewelry shop to have them resize your ring, or you can send it back to us for a re-size. Charges may apply; shipping is at your charges.
Take a look at my policies for more details:




Estimated arrival

The estimated delivery date is based on your purchase date, the recipient's location (actual or inferred), the seller's processing time and location, and the shipping carrier.

Other factors—such as shipping carrier delays or placing an order on weekend/holiday—may push the arrival of your item beyond this date.

Learn more

Oct 12-15

Sep 20

Order placed

After you place your order, MCDecarie will take 2 weeks to prepare it for shipment.

Oct 4

Order ships

MCDecarie puts your order in the mail.

Oct 12-15


Estimated to arrive at your doorstep Oct 12-15!

Returns & exchanges


There was a problem calculating your shipping. Please try again.

Ships from Canada
Marie-Claude Décarie

Marie-Claude Décarie

Owner of MCDecarie

Message Marie-Claude

This seller usually responds within a few hours.

1,598 reviews

5 out of 5 stars

Buyers are raving!

Multiple people gave 5-star reviews to this shop in the past 7 days.


Lisa Smith Sep 22, 2015

5 out of 5 stars

My order arrived super fast and I love everything about this shop. I can't wait to order our wedding bands from MCDECARIE. You will not find a better place to order your rings from.

Purchased item:

Karine Larose Jun 28, 2016

5 out of 5 stars

Tr?s facile ? utiliser, c'est arriv? super vite en plus! C'est vraiment rassurant d'avoir ce petit bidule pour bien pr?parer sa commande!!


Purchased item:

Jenna Lis Oct 14, 2015

5 out of 5 stars

Such a fabulously handy tool to ensure the right size when ordering rings from this shop. Everything fits exactly as I expected it to.

Purchased item:

Katie Bell Jul 9, 2015

5 out of 5 stars

I received this item so quick! Ordered our wedding bands tonight and I couldn't be more excited to see them!!

Purchased item:

Disclaimer: Etsy assumes no responsibility for the accuracy, labeling, or content of sellers' listings and products. Electrical or electronic products may pose a risk of fire or electrocution. Vintage, handmade, refurbished, or modified electrical or electronic products may not meet current safety standards and may not be in safe working order. Inspect carefully before use and contact the seller by sending a Message if you have concerns relating to the product. Do not use a vintage electrical or electronic item if its safety cannot be verified. To reduce the risk of fire, never leave vintage electrical or electronic products plugged in unattended. See Etsy's Terms of Use for more information.

Listed on May 25, 2021