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The Ultimate Guide to Ring Sizing; Standard Fit vs. Comfort Fit
Jewelry stores in the US, Canada, and parts of Mexico use standard US ring sizes. To find your size, measure the diameter or circumference of a ring you wear or directly measure your finger. Avoid printed ring sizers from the internet, as printer variations can lead to incorrect sizing. While all jewelers generally follow the same size chart, slight differences can occur due to rounding, meaning measurements may vary slightly between jewelers. Our ring size measurements are provided below. For a precise fit, request our free ring sizer by filling out the form—delivery takes about 2–5 days within the US.
For added precision, here’s a detailed chart of US ring sizes, including the inner diameter and circumference measurements in both millimeters and inches:
Jewelry stores in the US, Canada, and parts of Mexico use standard US ring sizes. To determine your size, measure the diameter or circumference of a ring you currently wear or directly measure your finger. Avoid using printable ring sizers, as they may not print accurately, leading to incorrect sizing.
Important: This chart is a guide. For the most precise fit, visit a local jeweler or request a free ring sizer from us (shipping takes 1–2 weeks). If you need a quick measurement, we recommend visiting a jeweler nearby.
Ring sizes vary across different countries. Use our chart below to find the equivalent sizes in other countries.
US Ring Size System (US, CA, MX):
UK Ring Size System (UK, AU, NZ, ZA, IE):
German Ring Size System (DE, AR):
European Ring Size System (FR, RU, DK, SE, NO, FI):
Brazilian Ring Size System (BR):
Primarily used in Brazil, with some use in neighboring South American countries.
Japanese Ring Size System (JP, CN, KR, HK, TW, SG):
Swiss Ring Size System (CH, ES):
Primarily used in Switzerland and Spain.
Similar to the European system, but starts at size 1 with a 40 mm circumference, with each size increasing by 1 mm.
Ring widths vary greatly, from a slim 2 mm up to a bold 20 mm. If you’re unsure how a specific width might look on your hand, choosing the right width can be a bit challenging.
There’s no "right" or "wrong" width; the ideal size is what feels and looks best to you. Generally, men often choose an 8 mm wedding band, with 6 mm as a close second.
For women, a 4 mm band is popular, though some prefer a slimmer 2 mm band depending on the width of their engagement ring. The goal is to ensure that the combined width of both rings is comfortable and visually balanced.
This photo provides a visual comparison of different ring widths commonly available for both men's and women's rings.
If a ruler isn't available, you can use a common 5¢ US nickel as a reference—the thickness of a nickel is approximately 2 mm.
A 2mm ring is about the width of a U.S. nickel, which measures approximately 1/16 of an inch, or close to 2mm.
A 6mm ring is roughly the width of three stacked U.S. nickels. Since each nickel is about 1/16 of an inch (close to 2mm), three stacked nickels, or 6mm, would be about 6/16 inch.
An 8mm ring is about the width of four stacked U.S. nickels. Each nickel is roughly 1/16 of an inch (around 2mm), so four stacked nickels, or 8mm, measure approximately 1/4 inch.
Use this quick reference to understand common ring widths in millimeters and their inch equivalents.
Comfort Fit:
Our rings are designed with a rounded interior, allowing the ring to slide on and off more easily. This fit style is ideal for alternative metals like tungsten, ceramic, and cobalt chrome, which benefit from a smooth, comfortable fit against the finger. Since the inner diameter widens towards the edges, comfort fit rings tend to feel a bit looser.
Standard Fit:
Traditional rings have a flat inner surface, keeping the diameter consistent across the entire ring. This fit style may feel slightly snugger than comfort fit rings of the same size.
Choosing Your Size:
Since comfort fit rings tend to fit looser, we generally recommend selecting a half size smaller than your standard fit size. However, if the ring width is 10mm or more, you may opt for your usual size.
Need more help? Use our free ring sizer for the most accurate measurement, or refer to this guide anytime you need sizing clarity.
