Fit guide
Find your ring size.
A ring should slide on easily and need a gentle tug to come off. Two minutes with a strip of paper gets you close; our boutique team will get you exact, free, any time you visit.
Measure at home with paper or string
- Cut a strip of paper about 5 mm wide, or use a length of string.
- Wrap it around the base of the finger — snug, not tight. Measure the finger you'll actually wear the ring on; your dominant hand is usually a little larger.
- Mark where the strip overlaps, then lay it flat against a millimetre ruler.
- That length is your inside circumference. Find it in the table below.
A few honest notes: fingers are smaller in the cold and in the morning, and larger at the end of a warm day. Measure two or three times and take the middle. Wide bands sit tighter than thin ones — if your band is 6 mm or wider, go up a half size.
Print a sizing strip
Print this page at 100% scale(no “fit to page”), then check the calibration bar below with a ruler before you cut. If the bar isn't exactly 50 mm, your printer scaled the page and the strip will lie to you.
Measure this line — it must be exactly 50 mm.
Cut along the strip, wrap it around your finger with the 0 mm end inside, and read the millimetre mark where it overlaps. Sizes: 4 = 47 mm · 5 = 49 mm · 6 = 52 mm · 7 = 54 mm · 8 = 57 mm · 9 = 60 mm · 10 = 62 mm · 11 = 65 mm · 12 = 67 mm · 13 = 70 mm
Size conversion table
Canadian and US ring sizes. Inside circumference is what a paper strip measures; inside diameter is what a ruler across an existing ring measures.
| Size (CA / US) | Inside diameter | Inside circumference |
|---|---|---|
| 4 | 14.9 mm | 46.8 mm |
| 4.5 | 15.3 mm | 48.0 mm |
| 5 | 15.7 mm | 49.3 mm |
| 5.5 | 16.1 mm | 50.6 mm |
| 6 | 16.5 mm | 51.9 mm |
| 6.5 | 16.9 mm | 53.1 mm |
| 7 | 17.3 mm | 54.4 mm |
| 7.5 | 17.7 mm | 55.7 mm |
| 8 | 18.1 mm | 57.0 mm |
| 8.5 | 18.5 mm | 58.2 mm |
| 9 | 18.9 mm | 59.5 mm |
| 9.5 | 19.4 mm | 60.8 mm |
| 10 | 19.8 mm | 62.1 mm |
| 10.5 | 20.2 mm | 63.4 mm |
| 11 | 20.6 mm | 64.6 mm |
| 11.5 | 21.0 mm | 65.9 mm |
| 12 | 21.4 mm | 67.2 mm |
| 12.5 | 21.8 mm | 68.5 mm |
| 13 | 22.2 mm | 69.7 mm |
Already own a ring that fits?
Lay it on a ruler and measure straight across the insideedge — that's the inside diameter. Match it to the middle column above. It's the most reliable home method, because it doesn't depend on how tightly you pulled the paper.
Or let us do it
Every Mulu boutique sizes fingers with a proper mandrel set, free and without an appointment — and if a piece you love isn't on the shelf in your size, we'll tell you what it takes to get it there.
Book an appointment Find your boutique Resize a ring you own