How To Measure A Ring Size

Alys Power
Jul 25
3 min read

If you are coming to a ring making workshop with us then the very first thing we will do is measure your size. A ring should be comfortable, it should feel like it moves on your finger when you wave your hand but it also shouldn't feel tight or uncomfortable when you make a fist. Getting the size right is one of the most difficult thing about making rings.

But what if you are making (or buying) a ring for someone else? Maybe you are planning a surprise proposal, treating yourself to a new piece of jewellery, or just curious about your ring size, knowing how to measure your finger properly can save time, money—and a trip to the jeweller. The good news? Measuring for a ring is easier than you might think!

Here’s a quick, friendly guide to help you get the right fit, every time.

Option 1: The String or Paper Strip Method (Quick & DIY)

What you'll need:

A piece of string or a thin strip of paper (about 6 inches long)
A ruler with millimeters
A pen

Steps:

Wrap it around your finger – Not too tight, not too loose. It should slide on and off and go over your knuckle with a little resistance.
Mark the spot – Use your pen to mark where the string or paper overlaps.
Measure it – Lay the string or paper flat and measure the length up to your mark in millimeters.
Check the chart – Use a ring size chart (see below) to convert the measurement into your ring size.

Tip: Measure at the end of the day when your fingers are largest. Avoid measuring when your hands are cold!

Option 2: Use a Ring You Already Own

If you (or the person you're making for) already wear rings, you’re in luck.

Steps:

Choose a ring that fits the correct finger.
Place it over a ring size chart or ruler and measure the inside diameter.
Match the diameter to the corresponding size on the chart.

Example: An inside diameter of 16.4mm = U.K ring size L.

If you are coming to a class, bring the ring with you and we can measure it one the day.

Option 3: Buy a Ring Sizer (Still DIY, But Fancier)

Ring sizers are inexpensive (usually under a few pounds), accurate, and reusable. You can find them online as plastic belt-style sizers or even a full set of size rings.

This is a great option if:

You want to measure multiple fingers
You're shopping for others
You just love tiny tools

Option 4: Visit a Jeweller (Most Accurate)

If you want zero doubt—especially for something as important as an engagement or wedding ring—your best bet is a professional sizing. Jewellers usually offer this for free and can also advise on fit depending on the band width and style. You are welcome to arrange a time to pop into the jewellery school to get measured.

Final Tips:

Finger sizes can change slightly based on temperature, hydration, and even time of day.
Wider bands may need a slightly larger size for comfort.
Always double-check if you’re ordering from another country—ring sizes vary (US, UK, EU systems all differ!).

The perfect fit is different for everyone, it should feel right on your finger and make you feel like the ring is made just for you.

UK Ring Size Chart (with Diameter & Circumference)

UK Size	Diameter (mm)	Circumference (mm)
F	14.0	44.0
G	14.4	45.2
H	14.8	46.5
I	15.2	47.8
J	15.6	49.0
K	16.0	50.3
L	16.4	51.6
M	16.8	52.8
N	17.2	54.0
O	17.6	55.3
P	18.0	56.5
Q	18.4	57.8
R	18.8	59.0
S	19.2	60.3
T	19.6	61.6
U	20.0	62.8
V	20.4	64.1
W	20.8	65.3
X	21.2	66.6
Y	21.6	67.9
Z	22.0	69.