Ring Size Guide

Use this chart to convert US, UK and EU ring sizes into inner diameter and inner circumference in millimeters. Product pages use ring sizing where a size option is required.

Ring Size Conversion

How to Measure a Ring

Measure once, confirm twice.

Measure at room temperature. Cold fingers measure smaller; warm fingers measure larger. For the best fit, measure the finger at the end of the day and repeat once.

Wrap the strip

Wrap a thin strip of paper or measuring tape around the finger where the ring will sit.

Check the fit

Keep it snug but not tight. It should still slide over the knuckle.

Mark and measure

Mark where the strip overlaps, then measure the length in millimeters.

Compare to the chart

Compare the measurement to the circumference column. If measuring an existing ring, use the inner diameter column instead.

Repeat to confirm

Repeat twice. Use the larger measurement if the result falls between two sizes.

Ring Size Conversion

Ring Size Guide

Ring size conversion by US, UK, EU, inner diameter and circumference
US	UK	EU	Inner diameter (mm)	Circumference (mm)
4	H	47	14.9	46.8
5	J	49	15.7	49.3
6	L	52	16.5	51.9
7	N	54	17.3	54.4
8	P	57	18.1	57.0
9	R	59	18.9	59.5
10	T	62	19.8	62.1
11	V	64	20.6	64.6
12	X	67	21.4	67.2

Ring Size Guide

Other jewellery measurements.

Rings

Use inner diameter for production and circumference for home measurement. If a customer is between sizes, choose the larger size for wider bands.

Necklaces

Common necklace lengths are 40 cm, 45 cm, 50 cm, and 60 cm. For wholesale, list chain length and extender length separately.

Bracelets

Measure wrist circumference and add 1.0-1.5 cm for a close bracelet fit, or 1.5-2.0 cm for a looser fashion fit. Bangles need hand-width confirmation.

Confirm the size in millimetres before dispatch so the buyer, production partner and customer use the same specification.
Jewena sizing standard

Still unsure? Email us at [email protected] with your inner diameter, current ring size, or a photo of the measuring tape.