Ring Sizing Guide
Finding your perfect ring size doesn't have to be complicated. Our comprehensive guide will help you measure accurately, convert between international sizing systems, and ensure a comfortable, secure fit.
Ring Size Chart
US sizes are the standard we use. If you know your size in another system, use this chart to convert.
| US | EU | UK/AU | Japan | Brazil | France | Swiss/DE | China | Diameter (mm) | Circumference (mm) |
|---|---|---|---|---|---|---|---|---|---|
| 4 | 47 | H | 10 | 9.5 | 39 | 47 | 13 | 14.9 | 46.8 |
| 4.5 | 48 | I | 11 | 10 | 40 | 48 | 14 | 15.3 | 48 |
| 5 | 49 | J | 12 | 10.5 | 41 | 49 | 15 | 15.7 | 49.3 |
| 5.5 | 50 | K | 13 | 11 | 42 | 50 | 16 | 16.1 | 50.6 |
| 6✓ | 51 | L | 14 | 11.5 | 43 | 51 | 17 | 16.5 | 51.9 |
| 6.5✓ | 52 | M | 15 | 12 | 44 | 52 | 18 | 16.9 | 53.1 |
| 7✓ | 53 | N | 16 | 12.5 | 45 | 53 | 19 | 17.3 | 54.4 |
| 7.5 | 54 | O | 17 | 13 | 46 | 54 | 20 | 17.7 | 55.7 |
| 8 | 55 | P | 18 | 13.5 | 47 | 55 | 21 | 18.1 | 56.9 |
| 8.5 | 56 | Q | 19 | 14 | 48 | 56 | 22 | 18.5 | 58.2 |
| 9 | 57 | R | 20 | 14.5 | 49 | 57 | 23 | 18.9 | 59.5 |
| 9.5 | 58 | S | 21 | 15 | 50 | 58 | 24 | 19.4 | 60.9 |
| 10 | 59 | T | 22 | 15.5 | 51 | 59 | 25 | 19.8 | 62.2 |
The most common women's ring sizes are 6, 6.5, and 7.
How to Find Your Size
Professional Measurement
Visit any jewelry store for a free, accurate measurement using professional ring sizers. This is the most reliable method.
Most accurateMeasure an Existing Ring
Measure the inside diameter of a ring that fits well on the same finger. Compare it to a size chart or bring it to a jeweler.
Highly accuratePrintable Ring Sizer
Print our ring sizer at 100% scale (do not fit to page). Cut out and wrap around your finger to find your size.
Accurate if printed correctlyString or Paper Method
Wrap a string or paper around your finger, mark where it overlaps, then measure the length against a ruler. Compare to size chart.
Good estimatePrint at 100% scale • Do not "fit to page"
Tips for Accurate Sizing
Measure multiple times
Take measurements at different times of day and average the results for the most accurate size.
Consider time of day
Fingers are typically smaller in the morning and can swell in heat or after exercise. Measure at different times.
Measure the correct finger
Each finger can be a different size, even on the same hand. Measure the exact finger you'll wear the ring on.
Account for ring width
Wider bands (6mm+) typically require going up half a size for comfort. Narrow bands fit more snugly.
Should be snug, not tight
Your ring should slide over your knuckle with slight resistance but feel comfortable once on.
When in doubt, size up
It's easier to size a ring down than up, especially with certain designs like eternity bands.
Planning a Surprise?
If you're planning a surprise proposal and don't know their ring size, don't worry. We offer complimentary resizing within 60 days of purchase.
Sneaky Sizing Tips
- • Borrow a ring they wear on the correct finger and trace it
- • Ask a friend or family member who might know
- • Compare their finger to yours while they sleep (gently!)
- • Size 6 or 6.5 is a safe guess for most women
- • When in doubt, go slightly larger - easier to size down
Still unsure? Our team is experts at helping with surprise proposals. Book a private consultation for personalized guidance.
Book a ConsultationOur Sizing Guarantee
We want you to love your ring from day one. That's why every Katura ring comes with:
Free First Resize
Complimentary resizing within 60 days of purchase
Size Range
Most rings can be resized ±2 sizes from original
Expert Care
All resizing done by our master jewelers in-house
Need Help with Sizing?
Our team is here to help ensure the perfect fit. Reach out anytime - we're happy to guide you.