Measure at Home! A Guide to Finding Your Perfect Ring Size

September 06, 2025

When buying a ring, besides the design and material, perhaps the most challenging part is choosing the right size.

You want to avoid experiences like, "It doesn't quite fit my finger..." or "It's too tight and hard to take off..."

Especially for fine jewelry, which you intend to cherish for a lifetime, choosing the perfect size is even more crucial.

Here, we'll explain in an easy-to-understand way how to find your perfect ring size.

Pear Shape Diamond Ring 1ct

Wave Diamond Ring

Why is the "perfect" ring size so important?

When a ring fits perfectly, it's not only comfortable, but it also looks beautiful and, most importantly, provides a sense of security.

If it's too loose, you might worry about losing it, and if it's too tight, it can strain your finger.

Especially for rings made of high-quality K18, K10 gold, or platinum, like those offered by BANYAN, a comfortable fit is crucial because you'll be wearing them for a long time.

Full Eternity Ring 2.5mm

Measure at Home! Ring Sizing Guide

Here's how you can easily measure your ring size at home, without having to visit a store.

Method 1: Using a ring sizer

The most accurate method is to purchase a ring sizer and measure each finger.
They are readily available online, so it might be a good idea to have one on hand.

Method 2: Using paper or string (easy to try)

Even without a ring sizer, you can easily measure your ring size using paper or string you have at home.

Cut a thin strip of paper or a piece of string and wrap it around the widest part of the finger where you want to wear the ring (if your knuckle is the widest part, make sure it passes over the knuckle).

Mark the point where the paper or string overlaps with a pen, and then measure its length.

This length is the "inner circumference" of your finger.

Refer to the inner circumference in the table below to check your ring size.

When measuring, be careful not to wrap it too tightly or too loosely.

Ring Size (JCS Standard)	Inner Diameter (mm)	Inner Circumference (mm)
1	13.0	40.8
2	13.3	41.9
3	13.7	42.9
4	14.0	44.0
5	14.3	45.0
6	14.7	46.1
7	15.0	47.1
8	15.3	48.2
9	15.7	49.2
10	16.0	50.3
11	16.3	51.3
12	16.7	52.4
13	17.0	53.4
14	17.3	54.5
15	17.7	55.5
16	18.0	56.6
17	18.3	57.6
18	18.7	58.6
19	19.0	59.7
20	19.3	60.7

Don't forget these important points when measuring!

To get a more accurate size, there are a few things to keep in mind.

Time of day: Finger swelling can change depending on the time of day and your physical condition. Fingers tend to swell more in the evening than in the morning, and more in summer than in winter. We recommend measuring several times and taking the average.
Finger shape: If your knuckle is thicker than the base of your finger, choose a size that passes over the knuckle.