Find your ring size

Print this page to measure your size at home — either by measuring a ring you already own, or by wrapping your finger. It takes a minute, and it’s just a guide.

Before you measure — print at actual size

Print on Letter or A4 paper at 100% / “Actual size” — turn off “Fit to page” or “Shrink to fit.”
Check the ruler below with a real ruler — it should read exactly 10 cm. If not, re-print and adjust the scale.

Prefer help? Book a jeweler

Ring Sizer

Formi Jewelry

Step 1 — Check the scale: this ruler must measure exactly 10 cm.

Method 1 — Measure a ring you own

Place a ring you already wear over these circles. The circle that fills the inside of your ring is your size.

3 · 14 mm

4 · 14.9 mm

5 · 15.7 mm

6 · 16.5 mm

7 · 17.3 mm

8 · 18.1 mm

9 · 18.9 mm

10 · 19.8 mm

11 · 20.6 mm

12 · 21.4 mm

13 · 22.2 mm

Method 2 — Wrap your finger

Cut out the strip, wrap it snugly around the base of your finger, and mark where it overlaps the start. Measure that length in mm on the ruler above, then find it in the circumferencecolumn of the chart.

✂ Cut out · wrap around finger · mark the overlap

Size chart (US)

Size	Dia	Circ
3	14 mm	44.0 mm
3.5	14.5 mm	45.6 mm
4	14.9 mm	46.8 mm
4.5	15.3 mm	48.1 mm
5	15.7 mm	49.3 mm
5.5	16.1 mm	50.6 mm
6	16.5 mm	51.8 mm

Size	Dia	Circ
6.5	16.9 mm	53.1 mm
7	17.3 mm	54.3 mm
7.5	17.7 mm	55.6 mm
8	18.1 mm	56.9 mm
8.5	18.5 mm	58.1 mm
9	18.9 mm	59.4 mm
9.5	19.4 mm	60.9 mm

Size	Dia	Circ
10	19.8 mm	62.2 mm
10.5	20.2 mm	63.5 mm
11	20.6 mm	64.7 mm
11.5	21 mm	66.0 mm
12	21.4 mm	67.2 mm
12.5	21.8 mm	68.5 mm
13	22.2 mm	69.7 mm

This sizer is a guide only (US sizes). For an exact fit on a final purchase, have your finger measured by a jeweler. Questions? formijewelry.com · admin@formijewelry.com