Swiss Ring Size Chart
A third-party reference labeled 'Swiss (CH, ES),' with approximate US size, diameter, and circumference in millimeters.
Third-party Swiss-size reference
This source labels these values 'Swiss (CH, ES)'; it is not evidence of one universal Switzerland or Spain scale.
| Swiss Size | Approx. US Size | Diameter (mm) | Circumference (mm) |
|---|---|---|---|
| Swiss Size4 | Approx. US Size3 | Diameter (mm)14.0-14.1 | Circumference (mm)44.0-44.2 |
| Swiss Size5 | Approx. US Size3¼ | Diameter (mm)14.5 | Circumference (mm)45.55 |
| Swiss Size5.5 | Approx. US Size3½ | Diameter (mm)— | Circumference (mm)— |
| Swiss Size6 | Approx. US Size3¾ | Diameter (mm)14.8 | Circumference (mm)46.5 |
| Swiss Size7 | Approx. US Size4 | Diameter (mm)14.8-15.0 | Circumference (mm)46.5-46.8 |
| Swiss Size7.5 | Approx. US Size4¼ | Diameter (mm)15.2-15.3 | Circumference (mm)47.0-48.07 |
| Swiss Size8 | Approx. US Size4½ | Diameter (mm)15.6 | Circumference (mm)49 |
| Swiss Size9 | Approx. US Size4¾ | Diameter (mm)— | Circumference (mm)— |
| Swiss Size9.5 | Approx. US Size5 | Diameter (mm)15.6-15.7 | Circumference (mm)48.5-49.3 |
| Swiss Size10 | Approx. US Size5¼ | Diameter (mm)16.1 | Circumference (mm)50.0-50.56 |
| Swiss Size10.5 | Approx. US Size5½ | Diameter (mm)16.0-16.2 | Circumference (mm)50.5-51.9 |
| Swiss Size11.5 | Approx. US Size5¾ | Diameter (mm)— | Circumference (mm)— |
| Swiss Size12 | Approx. US Size6 | Diameter (mm)16.4-16.6 | Circumference (mm)51.5-51.9 |
| Swiss Size12.5 | Approx. US Size6¼ | Diameter (mm)16.8-16.9 | Circumference (mm)52.5-53.08 |
| Swiss Size13.5 | Approx. US Size6½ | Diameter (mm)17.2 | Circumference (mm)53.0-54.0 |
| Swiss Size14 | Approx. US Size6¾ | Diameter (mm)— | Circumference (mm)— |
| Swiss Size14.5 | Approx. US Size7 | Diameter (mm)17.2-17.3 | Circumference (mm)53.7-54.5 |
| Swiss Size15 | Approx. US Size7¼ | Diameter (mm)17.7-17.8 | Circumference (mm)55.0-55.6 |
| Swiss Size16 | Approx. US Size7½ | Diameter (mm)18.0-18.1 | Circumference (mm)55.5-56.6 |
| Swiss Size16.5 | Approx. US Size7¾ | Diameter (mm)— | Circumference (mm)— |
| Swiss Size17 | Approx. US Size8 | Diameter (mm)18.1-18.2 | Circumference (mm)57.0-58.12 |
| Swiss Size18 | Approx. US Size8¼ | Diameter (mm)18.5 | Circumference (mm)— |
| Swiss Size18.5 | Approx. US Size8½ | Diameter (mm)18.5 | Circumference (mm)58.0-59.1 |
| Swiss Size19 | Approx. US Size8¾ | Diameter (mm)— | Circumference (mm)— |
| Swiss Size20 | Approx. US Size9 | Diameter (mm)19.0-19.1 | Circumference (mm)59.5-60.3 |
| Swiss Size20.5 | Approx. US Size9¼ | Diameter (mm)19.4 | Circumference (mm)60.0-60.94 |
| Swiss Size21 | Approx. US Size9½ | Diameter (mm)19.5-19.7 | Circumference (mm)61.0-62.1 |
| Swiss Size21.5 | Approx. US Size9¾ | Diameter (mm)— | Circumference (mm)— |
| Swiss Size22.5 | Approx. US Size10 | Diameter (mm)19.7-19.8 | Circumference (mm)62.0-63.45 |
| Swiss Size23 | Approx. US Size10¼ | Diameter (mm)20.2-20.4 | Circumference (mm)— |
| Swiss Size23.5 | Approx. US Size10½ | Diameter (mm)20.3-20.7 | Circumference (mm)63.5-64.6 |
| Swiss Size24.5 | Approx. US Size10¾ | Diameter (mm)— | Circumference (mm)— |
| Swiss Size25 | Approx. US Size11 | Diameter (mm)20.6-21.0 | Circumference (mm)64.5-65.97 |
| Swiss Size25.5 | Approx. US Size11¼ | Diameter (mm)21 | Circumference (mm)— |
| Swiss Size26 | Approx. US Size11½ | Diameter (mm)21 | Circumference (mm)66.0-67.2 |
| Swiss Size27 | Approx. US Size11¾ | Diameter (mm)— | Circumference (mm)— |
| Swiss Size27.5 | Approx. US Size12 | Diameter (mm)21.4-21.6 | Circumference (mm)67.5-68.49 |
| Swiss Size28 | Approx. US Size12¼ | Diameter (mm)— | Circumference (mm)— |
| Swiss Size29 | Approx. US Size12½ | Diameter (mm)21.8-22.0 | Circumference (mm)68.5-69.76 |
| Swiss Size29.5 | Approx. US Size12¾ | Diameter (mm)— | Circumference (mm)— |
| Swiss Size30 | Approx. US Size13 | Diameter (mm)22.2-22.3 | Circumference (mm)69.76-70.0 |
| Swiss Size31 | Approx. US Size13¼ | Diameter (mm)22.6 | Circumference (mm)— |
| Swiss Size32 | Approx. US Size13½ | Diameter (mm)22.9 | Circumference (mm)— |
| Swiss Size32.5 | Approx. US Size13¾ | Diameter (mm)— | Circumference (mm)— |
| Swiss Size33 | Approx. US Size14 | Diameter (mm)23.2 | Circumference (mm)— |
| Swiss Size33.5 | Approx. US Size14¼ | Diameter (mm)— | Circumference (mm)— |
| Swiss Size34.5 | Approx. US Size14½ | Diameter (mm)23.6 | Circumference (mm)— |
| Swiss Size35 | Approx. US Size14¾ | Diameter (mm)— | Circumference (mm)— |
| Swiss Size36 | Approx. US Size15 | Diameter (mm)— | Circumference (mm)— |
| Swiss Size36.5 | Approx. US Size15¼ | Diameter (mm)— | Circumference (mm)— |
| Swiss Size37 | Approx. US Size15½ | Diameter (mm)— | Circumference (mm)— |
| Swiss Size37.5 | Approx. US Size15¾ | Diameter (mm)— | Circumference (mm)— |
| Swiss Size38.5 | Approx. US Size16 | Diameter (mm)— | Circumference (mm)— |
Confirm your retailer's guide
This page preserves one third-party chart's labels only. A Swiss-market jeweler, Pomellato, states that its ring sizes follow the French standard, so do not assume this table applies to every Swiss or Spanish retailer. Confirm the seller's own size guide, or convert a measured diameter or circumference (in mm, cm, or inches) with the ring size calculator instead.
Frequently asked questions
Is there an official Swiss national ring size standard?
No universal Swiss scale could be independently verified in this audit. This page preserves one third-party chart labeled "Swiss (CH, ES)" exactly as published — treat it as a reference, not a standard, and confirm your retailer’s guide.
Why are the US sizes marked approximate?
The source’s numbering does not land exactly on US half-size steps, so the US column gives nearest equivalents. For precision, work from the millimeter diameter or circumference columns instead.
What does the "(CH, ES)" label mean?
It is the source chart’s own label, suggesting relevance to Switzerland and Spain. We preserve the label verbatim rather than interpreting it, since no authoritative document ties one scale to both countries.
How should I choose a size from a Swiss jeweler?
Ask for the inside diameter in millimeters — Swiss and European jewelers routinely work in millimeters — then convert with the ring size calculator. A millimeter figure removes all ambiguity about which "Swiss" scale a chart means.