01
A ring you already own
Place a ring that fits the same finger over a ruler. Measure straight across the inside edge at its widest point. Use the inside diameter in millimetres.
Measure the inside opening, not the outside of the ring.
THE FIT GUIDE / US SIZING
Find the size that feels like yours.
A comfortable ring begins with one careful measurement. Use a ring you already wear, measure your finger with paper, or try a professional ring sizer. Then compare your result with our US size chart.
Our rings use US sizes from 1.5 to 15, in half-size steps.
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Three ways to measure
Choose the method that works with what you have nearby.
02
A strip of paper
Wrap a narrow, non-stretch strip around the base of your finger. Mark where the ends meet, lay it flat, and measure the length in millimetres. This is your finger circumference.
It should pass over your knuckle without pinching or slipping.
03
A ring sizer
For the most reliable fit, try a US-size ring sizer at a jeweller. Check how it feels at the base of your finger and as it passes over the knuckle.
Confirm that the tool is marked in US sizes.
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Turn your measurement into a size
Enter the millimetres you measured. We will show the closest available US size.
mm
Closest US size—
Enter a measurement to see your size.
Home measurements are a starting point. If you are between sizes, try a ring sizer before ordering.
US ring size chart
Inside diameter and circumference are rounded to one decimal place. Measurements follow the sizes used for our rings.
| US size | Inside Ø (mm) | Circumference (mm) |
|---|---|---|
| US 1.5 | 12.8 | 40.2 |
| US 2 | 13.2 | 41.5 |
| US 2.5 | 13.6 | 42.8 |
| US 3 | 14.0 | 44.1 |
| US 3.5 | 14.4 | 45.4 |
| US 4 | 14.8 | 46.6 |
| US 4.5 | 15.2 | 47.9 |
| US 5 | 15.7 | 49.2 |
| US 5.5 | 16.1 | 50.5 |
| US 6 | 16.5 | 51.7 |
| US 6.5 | 16.9 | 53.0 |
| US 7 | 17.3 | 54.3 |
| US 7.5 | 17.7 | 55.6 |
| US 8 | 18.1 | 56.8 |
| US 8.5 | 18.5 | 58.1 |
| US 9 | 18.9 | 59.4 |
| US 9.5 | 19.3 | 60.7 |
| US 10 | 19.7 | 61.9 |
| US 10.5 | 20.1 | 63.2 |
| US 11 | 20.5 | 64.5 |
| US 11.5 | 20.9 | 65.8 |
| US 12 | 21.3 | 67.1 |
| US 12.5 | 21.8 | 68.3 |
| US 13 | 22.2 | 69.6 |
| US 13.5 | 22.6 | 70.9 |
| US 14 | 23.0 | 72.2 |
| US 14.5 | 23.4 | 73.4 |
| US 15 | 23.8 | 74.7 |
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A few fit details
- Measure the finger you plan to wear the ring on. Your left and right hands may differ.
- Measure at room temperature, preferably later in the day. Cold fingers can measure smaller.
- Repeat the measurement two or three times. A wider ring may feel snugger than a narrow one.
MORROW ATELIER
Ready to make it yours?
Take your US size back to the studio and shape your own inscription ring.
Go to the design studio