Ring Size Conversion Chart matters especially when you're ordering online. A ring that's even half a size off can feel too tight or too loose, and resizing isn't always simple, particularly for moissanite solitaires and wide-band engagement rings. This chart covers US, UK, EU, and international sizing so you can shop JBR Jewelers with confidence, no matter where you're buying from.
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US to UK Ring Size Conversion Chart
Use this table to convert between US/Canada sizes, UK/Australia letter sizes, and EU metric measurements. EU sizes can be expressed as either the inner diameter (mm) or the inner circumference (mm) — both are included below.
No ring gauge? No problem. These four methods work well and you likely have everything you need already.
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1. String Method
Cut a thin strip of paper or thread. Wrap it around the base of your finger (not the knuckle). Mark where it overlaps, then lay it flat and measure in millimetres. Match that measurement to the EU circumference column above.
2. Paper Strip Method
Same as the string method but use a strip of paper about 6mm wide. Wrap snugly, mark the overlap, and measure. Paper holds its shape better than string, so results tend to be slightly more accurate.
3. Existing Ring Diameter
Place a ring you already own and wear on your finger on a flat surface. Measure the inner diameter (the space inside the ring) in millimetres. Match that to the EU Diameter (mm) column in the chart above.
4. Printable Ring Sizer
Download a printable ring sizer (available for free on most jewellery sizing sites). Print at 100% scale — do not scale to fit the page — and follow the on-page instructions. This is one of the most reliable at-home methods.
Best practice: Measure at the end of the day when your fingers are at their largest. Avoid measuring when fingers are cold or swollen. If you're between two sizes, always go up — it's easier to resize down.
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Ring Size Tips for JBR Rings
Not all rings fit the same way, even at the same stated size. Here's what to keep in mind when ordering from JBR Jewelers:
•    Wide band rings (6mm+): Wide bands sit differently on the finger and can feel tighter than a standard band of the same size. Go up half a size when ordering any wide-band or channel-set design.
•    Moissanite solitaires: Classic solitaire settings with a standard 2mm band fit true to size. If you're ordering a halo or a design with a wider shank, size up half a size.
•    Bridal sets: When stacking an engagement ring with a wedding band, the combined width means both rings together will feel tighter. Order the engagement ring true to size and the band half a size up, or consult the product notes.
•    Hip-hop & iced-out pieces: Men's rings and bold statement pieces tend to run slightly larger. Check the product size guide on each listing for band-specific guidance.
•    Not sure? If you're between sizes, always go with the larger size — it's much easier to resize a ring down than up, and most moissanite settings can be adjusted by a local jeweller.
Browse JBR collections by ring type:
•    Moissanite Engagement Rings
•    Lab-Grown Diamond Engagement Rings
•    Bridal Sets
•    Hip-Hop & Iced-Out Jewelry
Pro tip: EU circumference is the most precise measurement — if you have a tailor's tape, use that number directly.
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International Ring Size Conversion (Japan, France, Germany, Australia)
Ordering from outside the US or UK? This full international chart maps across all major sizing systems.
Note: Japan and France use numeric sizes based on circumference; Germany uses a slightly different numeric scale. Australian sizes follow the UK letter system.
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How to Measure Your Ring Size at Home
FAQÂ
How do I convert my US ring size to UK?
A: US ring sizes are numeric (e.g. US 6) while UK sizes are alphabetical (e.g. UK L½). Use the conversion chart above — US 6 = UK L½, US 7 = UK N½, and so on. The chart covers sizes 3 through 12.
What is the most common ring size for women?
A: In the US, the average women's ring size is between US 6 and US 7 (UK L½–N½, EU 52–54). That said, ring size varies significantly and the best way to find your size is to measure at home or visit a local jeweller.
Should I size up or down for a wide band?
A: Size up — specifically, go half a size larger than your measured size. Wide bands (6mm+) sit further across the finger and feel noticeably tighter than a narrow band at the same stated size.
 Can moissanite rings be resized?
A: Yes, in most cases. Standard solitaire settings can be resized by one to two sizes by a professional jeweller. Rings with stones set all the way around (eternity bands or full pavé settings) are harder to resize and may require a replacement. When in doubt, go up half a size when ordering.
My fingers are different sizes — which hand should I measure?
A: Measure the finger on the hand you plan to wear the ring on. The dominant hand is usually slightly larger. Fingers can also vary throughout the day — they tend to be smallest in the morning and largest in the evening. Measure at the end of the day for the most accurate fit.
