Ring size guide
RING SIZE CONVERSION CHART BY FORMÉS
FORMES Ring Size Guide
Finding your ring size should feel as effortless as slipping on your favorite piece. Whether you're choosing a gift or treating yourself, here's how to get the perfect fit at home.
1. Measure Your Finger
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Take a soft ribbon, string, or strip of paper and wrap it gently around your finger. Make sure it slides comfortably over your knuckle.
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Mark where it overlaps and measure the length in millimeters.
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That number is your finger’s circumference. For example, 54 mm means size EU 54.
Tip: If you're between sizes, go one size up. If you’re choosing a slim ring, you can opt for a slightly smaller size.
2. Measure a Ring You Already Own
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Pick a ring that fits the intended finger.
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Lay it flat and measure the inside diameter in millimeters across the widest point.
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Match this diameter to our size chart.
Sample of size 15, or 15 mm inner diameter
Helpful Sizing Tips-
Fingers on your dominant hand are usually a bit bigger.
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Warm weather = slightly larger fingers; cold = slightly smaller.
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Wide bands (6mm+) feel tighter—go half a size up.
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Slim stacking rings? Choose a snug fit.
Ring Size Conversion Chart
| Diameter (mm) | Circumference (mm) | EU Size | US Size | UK Size | Japan Size |
|---|---|---|---|---|---|
| 14.0 | 44 | 44 | 3 | E | 4 |
| 14.4 | 45 | 45 | 3¼ | F | 5½ |
| 14.7 | 46 | 46 | 3¾ | G | 6 |
| 15.0 | 47 | 47 | 4 | H | 7 |
| 15.3 | 48 | 48 | 4½ | I | 8 |
| 15.6 | 49 | 49 | 5 | I½ | 9 |
| 15.9 | 50 | 50 | 5¼ | J | 10 |
| 16.2 | 51 | 51 | 5¾ | K | 11 |
| 16.5 | 52 | 52 | 6 | L | 12 |
| 16.9 | 53 | 53 | 6¼ | M | 13 |
| 17.3 | 54 | 54 | 7 | N | 14 |
| 17.5 | 55 | 55 | 7¼ | N½ | 15 |
| 17.8 | 56 | 56 | 7½ | O | 16 |
| 18.2 | 57 | 57 | 8 | P | 16½ |
| 18.6 | 58 | 58 | 8½ | Q | 17 |
| 18.8 | 59 | 59 | 8¾ | R | 18 |
| 19.1 | 60 | 60 | 9 | R½ | 18½ |
| 19.4 | 61 | 61 | 9½ | S | 19 |
| 19.8 | 62 | 62 | 10 | T | 20 |
| 20.2 | 63 | 63 | 10¼ | U | 21 |
| 20.6 | 64 | 64 | 10¾ | V | 22 |
| 20.8 | 65 | 65 | 11 | V½ | 23 |
| 21.0 | 66 | 66 | 11½ | W | 24 |
| 21.3 | 67 | 67 | 12 | X | 25 |
| 21.8 | 68 | 68 | 12½ | X½ | 26 |
| 22.1 | 69 | 69 | 12¾ | Z | 27 |
| 22.3 | 70 | 70 | 13 | Z+1 | 28 |
| 22.6 | 71 | 71 | 13½ | Z+2 |
29 |
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Statement rings: If bold and wide, go half a size up.
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Stacking rings: Measure the exact finger and go for a snug fit.
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Knuckle/midi rings: These often run small—check specific design notes.
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Engagement and wedding bands: Precision matters. Measure carefully or contact us for help.
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Open rings: These are slightly adjustable but still follow our sizing guide.