Ring Sizing
Ring Size Guide
Find Your Perfect Ring Size
Measure at home and convert to your size. Use your finger’s circumference in millimetres as the primary reference.
Step-by-Step
Prepare a strip of paper (≈10 cm long, 5 mm wide) or a non-stretch string, a fine pen, and a ruler in millimetres.
Wrap the strip around the base of the chosen finger. It should be snug but not tight.
Mark where the strip overlaps. Lay it flat and measure the length in millimetres — this is your circumference.
Convert using the table below. If between sizes, choose the larger size (especially for wide bands).
Tip: Measure at the end of the day, avoid measuring when cold, and repeat 2–3 times for consistency.
Conversion Table
| Ireland (UK) | EUR Circumference (mm) | Diameter (mm) | UK / US / AUS | Letter |
|---|---|---|---|---|
| F | 44.2 | 14.1 | US 3 | F |
| G | 45.5 | 14.5 | US 3.5 | G |
| H | 46.8 | 14.9 | US 4 | H |
| I | 48.0 | 15.3 | US 4.5 | I |
| J | 49.3 | 15.7 | US 5 | J |
| K | 50.6 | 16.1 | US 5.5 | K |
| L | 51.9 | 16.5 | US 6 | L |
| M | 53.1 | 16.9 | US 6.5 | M |
| N | 54.4 | 17.3 | US 7 | N |
| O | 55.7 | 17.7 | US 7.5 | O |
| P | 57.0 | 18.1 | US 8 | P |
| Q | 58.3 | 18.6 | US 8.5 | Q |
| R | 59.5 | 18.9 | US 9 | R |
| S | 60.8 | 19.4 | US 9.5 | S |
| T | 62.1 | 19.8 | US 10 | T |
| U | 63.4 | 20.2 | US 10.5 | U |
| V | 64.6 | 20.6 | US 11 | V |
Between sizes?
Choose the larger size. For wide bands, consider going up half a size.
Professional sizing
For a precision fit, visit a local jeweller to be sized with metal ring gauges.
Gift sizing
Measure a ring they already wear on the intended finger (inner diameter × π ≈ circumference).
Minor variations exist between makers. Use your measured circumference in millimetres as the primary reference.