Ring Sizing Guide

How to measure for a ring correctly

Trying to figure out your ring size at home can be tricky, especially if you are buying a ring as a surprise for someone. This ring sizing guide will help you to measure your ring size so that you can be sure of getting the perfect fit. With this ring sizing guide, you’ll be able to find the perfect ring for you in no time!

Do’s

Do figure out the size of the actual finger you intend to wear the ring on – sizes differ by finger but also by hand!
Watch out for Goldilocks – Do make sure you are measuring your finger when you are comfortably warm, not too hot nor too cold, as your finger will swell or shrink accordingly!
Do err on the side of larger if you are in between sizes. It’s a good idea to measure the size of the knuckle you have to get the ring over also – a size in between the knuckle and the finger might be the best bet. It should be a wobble/pull effort over the knuckle though and should not fit easily over, otherwise your ring will fall off!

Don’ts

Don’t measure once. Take the measurement 3 or 4 times, preferably using different methods, to ensure best accuracy.
Don’t assume the size for the left hand finger will be the same on the right, or vice versa.

Method one

Use your local Jeweller

Pop into your local jeweller and ask them kindly to help size your finger. This method is the most accurate way to ensure you get it right.

Method two

Measure your own finger

Wrap a thin strip of paper or length of string around the base of the finger you wish to wear the ring on. If you have larger knuckles measure this too – you may want to select a size in between to allow the ring to slip on comfortably.
Mark the spot where the paper/string meets.
Measure the paper/string’s distance with a ruler.
Use the ring size chart to determine your ring size.

Method three

Measure your own ring

Find a ring you already have that fits the finger you wish to size.
Place it over a ruler and measure the inside ring diameter.
Use the ring size chart to determine your size.

Diameter (mm)	Inside circumference (mm)	NZ, Aus, UK & Ireland	USA & Canada	France	Germany	Italy, Spain, Netherland, Switzerland	Hong Kong, Macau, Taiwan, Japan, Singapore, China
Diameter (mm) 14.1	Inside circumference (mm) 44.2	NZ, Aus, UK & Ireland F	USA & Canada 3	France 44	Germany 14	Italy, Spain, Netherland, Switzerland 4	Hong Kong, Macau, Taiwan, Japan, Singapore, China 4
Diameter (mm) 14.3	Inside circumference (mm) 44.8	NZ, Aus, UK & Ireland F ½	USA & Canada	France	Germany	Italy, Spain, Netherland, Switzerland 5 ¼	Hong Kong, Macau, Taiwan, Japan, Singapore, China 5
Diameter (mm) 14.5	Inside circumference (mm) 45.5	NZ, Aus, UK & Ireland G	USA & Canada 3.5	France 45 ¼	Germany 14 ½	Italy, Spain, Netherland, Switzerland	Hong Kong, Macau, Taiwan, Japan, Singapore, China
Diameter (mm) 14.7	Inside circumference (mm) 46.1	NZ, Aus, UK & Ireland G ½	USA & Canada	France	Germany	Italy, Spain, Netherland, Switzerland 6 ½	Hong Kong, Macau, Taiwan, Japan, Singapore, China 6
Diameter (mm) 14.9	Inside circumference (mm) 46.8	NZ, Aus, UK & Ireland H	USA & Canada 4	France 46 ½	Germany 15	Italy, Spain, Netherland, Switzerland	Hong Kong, Macau, Taiwan, Japan, Singapore, China 7
Diameter (mm) 15.1	Inside circumference (mm) 47.4	NZ, Aus, UK & Ireland H ½	USA & Canada	France	Germany	Italy, Spain, Netherland, Switzerland 7 ¾	Hong Kong, Macau, Taiwan, Japan, Singapore, China
Diameter (mm) 15.3	Inside circumference (mm) 48	NZ, Aus, UK & Ireland I	USA & Canada 4.5	France 47 ¾	Germany 15 ¼	Italy, Spain, Netherland, Switzerland 8	Hong Kong, Macau, Taiwan, Japan, Singapore, China 8
Diameter (mm) 15.5	Inside circumference (mm) 48.7	NZ, Aus, UK & Ireland J	USA & Canada	France	Germany	Italy, Spain, Netherland, Switzerland 9	Hong Kong, Macau, Taiwan, Japan, Singapore, China
Diameter (mm) 15.7	Inside circumference (mm) 49.3	NZ, Aus, UK & Ireland J ½	USA & Canada 5	France 49	Germany 15 ¾	Italy, Spain, Netherland, Switzerland 9 ½	Hong Kong, Macau, Taiwan, Japan, Singapore, China 9
Diameter (mm) 15.9	Inside circumference (mm) 50	NZ, Aus, UK & Ireland K	USA & Canada	France	Germany	Italy, Spain, Netherland, Switzerland 10	Hong Kong, Macau, Taiwan, Japan, Singapore, China
Diameter (mm) 16.1	Inside circumference (mm) 50.6	NZ, Aus, UK & Ireland K ½	USA & Canada 5.5	France 50 ¾	Germany 16	Italy, Spain, Netherland, Switzerland 10 ¾	Hong Kong, Macau, Taiwan, Japan, Singapore, China 10
Diameter (mm) 16.3	Inside circumference (mm) 51.2	NZ, Aus, UK & Ireland L	USA & Canada	France	Germany	Italy, Spain, Netherland, Switzerland 11 ¾	Hong Kong, Macau, Taiwan, Japan, Singapore, China
Diameter (mm) 16.5	Inside circumference (mm) 51.9	NZ, Aus, UK & Ireland L ½	USA & Canada 6	France 51 ½	Germany 16 ½	Italy, Spain, Netherland, Switzerland 12 ¾	Hong Kong, Macau, Taiwan, Japan, Singapore, China 11
Diameter (mm) 16.7	Inside circumference (mm) 52.5	NZ, Aus, UK & Ireland M	USA & Canada	France	Germany	Italy, Spain, Netherland, Switzerland	Hong Kong, Macau, Taiwan, Japan, Singapore, China 12
Diameter (mm) 16.9	Inside circumference (mm) 53.1	NZ, Aus, UK & Ireland M ½	USA & Canada 6.5	France 52 ¾	Germany 17	Italy, Spain, Netherland, Switzerland 14	Hong Kong, Macau, Taiwan, Japan, Singapore, China 13
Diameter (mm) 17.1	Inside circumference (mm) 53.8	NZ, Aus, UK & Ireland N	USA & Canada	France	Germany	Italy, Spain, Netherland, Switzerland	Hong Kong, Macau, Taiwan, Japan, Singapore, China
Diameter (mm) 17.3	Inside circumference (mm) 54.4	NZ, Aus, UK & Ireland N ½	USA & Canada 7	France 54	Germany 17 ¼	Italy, Spain, Netherland, Switzerland 15 ¼	Hong Kong, Macau, Taiwan, Japan, Singapore, China 14
Diameter (mm) 17.5	Inside circumference (mm) 55.1	NZ, Aus, UK & Ireland O	USA & Canada	France	Germany	Italy, Spain, Netherland, Switzerland	Hong Kong, Macau, Taiwan, Japan, Singapore, China
Diameter (mm) 17.7	Inside circumference (mm) 55.7	NZ, Aus, UK & Ireland O ½	USA & Canada 7.5	France 55 ¼	Germany 17 ¾	Italy, Spain, Netherland, Switzerland 16 ½	Hong Kong, Macau, Taiwan, Japan, Singapore, China 15
Diameter (mm) 17.9	Inside circumference (mm) 56.3	NZ, Aus, UK & Ireland P	USA & Canada	France	Germany	Italy, Spain, Netherland, Switzerland	Hong Kong, Macau, Taiwan, Japan, Singapore, China
Diameter (mm) 18.1	Inside circumference (mm) 57	NZ, Aus, UK & Ireland P ½	USA & Canada 8	France 56 ¾	Germany 18	Italy, Spain, Netherland, Switzerland 17 ¾	Hong Kong, Macau, Taiwan, Japan, Singapore, China 16
Diameter (mm) 18.3	Inside circumference (mm) 57.6	NZ, Aus, UK & Ireland Q	USA & Canada	France	Germany	Italy, Spain, Netherland, Switzerland	Hong Kong, Macau, Taiwan, Japan, Singapore, China
Diameter (mm) 18.5	Inside circumference (mm) 58.3	NZ, Aus, UK & Ireland Q ½	USA & Canada 8.5	France 58	Germany 18 ½	Italy, Spain, Netherland, Switzerland 18 ½	Hong Kong, Macau, Taiwan, Japan, Singapore, China 17
Diameter (mm) 18.8	Inside circumference (mm) 58.9	NZ, Aus, UK & Ireland R	USA & Canada	France	Germany	Italy, Spain, Netherland, Switzerland 19	Hong Kong, Macau, Taiwan, Japan, Singapore, China
Diameter (mm) 19	Inside circumference (mm) 59.5	NZ, Aus, UK & Ireland R ½	USA & Canada 9	France 59 ¼	Germany 19	Italy, Spain, Netherland, Switzerland 20	Hong Kong, Macau, Taiwan, Japan, Singapore, China 18
Diameter (mm) 19.2	Inside circumference (mm) 60.2	NZ, Aus, UK & Ireland S	USA & Canada	France	Germany	Italy, Spain, Netherland, Switzerland 20 ¼	Hong Kong, Macau, Taiwan, Japan, Singapore, China
Diameter (mm) 19.4	Inside circumference (mm) 60.8	NZ, Aus, UK & Ireland S ½	USA & Canada 9.5	France 60 ¾	Germany 19 ½	Italy, Spain, Netherland, Switzerland 21	Hong Kong, Macau, Taiwan, Japan, Singapore, China 19
Diameter (mm) 19.6	Inside circumference (mm) 61.4	NZ, Aus, UK & Ireland T	USA & Canada	France	Germany	Italy, Spain, Netherland, Switzerland 21 ½	Hong Kong, Macau, Taiwan, Japan, Singapore, China
Diameter (mm) 19.8	Inside circumference (mm) 62.1	NZ, Aus, UK & Ireland T ½	USA & Canada 10	France 61 ¾	Germany 20	Italy, Spain, Netherland, Switzerland 21 ¾	Hong Kong, Macau, Taiwan, Japan, Singapore, China 20
Diameter (mm) 20	Inside circumference (mm) 62.7	NZ, Aus, UK & Ireland U	USA & Canada	France	Germany	Italy, Spain, Netherland, Switzerland	Hong Kong, Macau, Taiwan, Japan, Singapore, China 21
Diameter (mm) 20.2	Inside circumference (mm) 63.4	NZ, Aus, UK & Ireland U ½	USA & Canada 10.5	France 62 ¾	Germany 20 ¼	Italy, Spain, Netherland, Switzerland	Hong Kong, Macau, Taiwan, Japan, Singapore, China 22
Diameter (mm) 20.4	Inside circumference (mm) 64	NZ, Aus, UK & Ireland V	USA & Canada	France	Germany	Italy, Spain, Netherland, Switzerland	Hong Kong, Macau, Taiwan, Japan, Singapore, China
Diameter (mm) 20.6	Inside circumference (mm) 64.6	NZ, Aus, UK & Ireland V ½	USA & Canada 11	France 64 ¼	Germany 20 ¾	Italy, Spain, Netherland, Switzerland 24	Hong Kong, Macau, Taiwan, Japan, Singapore, China 23
Diameter (mm) 20.8	Inside circumference (mm) W	NZ, Aus, UK & Ireland W	USA & Canada	France	Germany	Italy, Spain, Netherland, Switzerland 25	Hong Kong, Macau, Taiwan, Japan, Singapore, China
Diameter (mm) 21	Inside circumference (mm) 65.9	NZ, Aus, UK & Ireland W ½	USA & Canada 11.5	France 66	Germany 21	Italy, Spain, Netherland, Switzerland 25 ¾	Hong Kong, Macau, Taiwan, Japan, Singapore, China 24
Diameter (mm) 21.2	Inside circumference (mm) 66.6	NZ, Aus, UK & Ireland X	USA & Canada	France	Germany	Italy, Spain, Netherland, Switzerland	Hong Kong, Macau, Taiwan, Japan, Singapore, China
Diameter (mm) 21.4	Inside circumference (mm) 67.2	NZ, Aus, UK & Ireland X ½	USA & Canada 12	France 67 ¼	Germany 21 ¼	Italy, Spain, Netherland, Switzerland 27 ½	Hong Kong, Macau, Taiwan, Japan, Singapore, China 25
Diameter (mm) 21.6	Inside circumference (mm) 67.8	NZ, Aus, UK & Ireland Y	USA & Canada	France	Germany	Italy, Spain, Netherland, Switzerland	Hong Kong, Macau, Taiwan, Japan, Singapore, China
Diameter (mm) 21.8	Inside circumference (mm) 68.5	NZ, Aus, UK & Ireland Z	USA & Canada 12.5	France 68	Germany 21 ¾	Italy, Spain, Netherland, Switzerland 28 ¾	Hong Kong, Macau, Taiwan, Japan, Singapore, China 26
Diameter (mm) 22	Inside circumference (mm) 69.1	NZ, Aus, UK & Ireland Z ½	USA & Canada	France	Germany	Italy, Spain, Netherland, Switzerland	Hong Kong, Macau, Taiwan, Japan, Singapore, China
Diameter (mm) 22.2	Inside circumference (mm) 69.7	NZ, Aus, UK & Ireland	USA & Canada 13	France 69	Germany 22	Italy, Spain, Netherland, Switzerland 29 ¼	Hong Kong, Macau, Taiwan, Japan, Singapore, China 27
Diameter (mm) 22.4	Inside circumference (mm) 70.4	NZ, Aus, UK & Ireland Z+1	USA & Canada	France	Germany	Italy, Spain, Netherland, Switzerland	Hong Kong, Macau, Taiwan, Japan, Singapore, China
Diameter (mm) 22.6	Inside circumference (mm) 71	NZ, Aus, UK & Ireland	USA & Canada 13.5	France	Germany	Italy, Spain, Netherland, Switzerland	Hong Kong, Macau, Taiwan, Japan, Singapore, China

Method four

Match your own ring

To size a ring you already have,

Print out our Ring Sizing Guide to 100% (ensure page scaling is set to “none”)
Check the size is calibrated by measuring the line below on your paper – it should be 5cm.

Find a ring you already have that fits the finger you wish to size.
Lay it directly onto the circles below to find the one where the black circle matches your ring’s inner diameter.
If your size falls somewhere between two sizes, you should opt for the bigger size.

Method five

Request a ring sizer

Request a reusable ring sizer from us (you will need to register with us for your address details).
Once received, simply push the end through the buckle to form a ring shape.
Slip the ring sizer onto the finger you wish to size.
Adjust to give a comfortable fit, checking that it just slips back over the knuckle.
When best fit is achieved, read off size indicated by the arrow.

Danielle P.

23:35 29 Aug 25

I absolutely love my ring from Hart and Halo. Celeste is more obsessed with sapphires than I am and provides a truly unique piece at a great price. I look forward to my next design and piece with her ☺️ I highly recommend her and her business to anyone wanting something a bit special and unique just to you.

karma G.

11:16 27 Aug 25

My ring is well made and beautiful.
Celeste was extremely patient, knowledgeable and kind. She helped push when I needed a push to make a decision. The result is a wonderful family heirloom. Im so pleased we worked together.

Angie M.

04:34 22 Aug 25

Easy process & detail was on point. Very happy with end result. Thank you Celeste & team.

Paul N.

05:07 17 Aug 25

From the very start to finish, our experience with Celeste was nothing short of amazing. She took the time to truly understand Jade's vision and guided her through every detail of the design process with warmth, patience, and genuine passion for her craft.
The craftsmanship is amazing, every angle of the engagement ring sparkles beautifully, and the attention to detail is second to none. It’s clear that Hart and Halo take great pride in their work, creating not just jewellery, but treasured pieces that tell a story.
Communication with Celeste was excellent throughout the entire process, with regular updates and reassurance that the ring was in the best hands. The final piece exceeded all our expectations and it’s more stunning than we could have ever imagined, and my partner has received endless compliments on it.

Even the process of getting a few touch ups on the ring was simple. Celeste took great care of us and even though we hadn't worked with her before, she was well read on our journey and already had all the details she needed. Very kind and professional.

We are both so grateful for her skill, professionalism, and care. From the moment you meet Cleste you feel comfortable and she makes you feel at home. We wouldn’t hesitate to recommend Hart and Halo to anyone looking for a truly special, custom-made piece. They truly care and can turn dreams into reality.

Jade and Paul

Stigma ..

20:24 14 Aug 25

Love my 1 of 1 necklace. I was able to be hands on with this and got it exactly how I wanted it. Thanks.

Kelly R.

19:26 11 Aug 25

Meeting Celeste was a via a very random click on a Facebook post and realising it was meant to be. Right from the beginning, Celeste was open and honest and genuine. For her jewellery, for her creativity, for her passion in what she does. Sometimes we meet people that we just click with, so though this journey created a beautiful piece of jewellery that symbolises a new beginning for me, this journey also created a fabulous connection with someone like minded. Bring on the next piece!
I can’t recommend Hart & Halo enough. For everything you could possibly need - valuations, resizing, remodelling, cleaning.
This has been such a pleasure 🧡

Mary A.

23:00 10 Aug 25

Working with Hart & Halo was wonderful. Great service. We're so pleased.

Tayla B.

07:39 19 May 25

This was my first time having an engagement ring let alone designing it. I thought it was just a basic design but found out there are soooo many details that go into a rings. Celeste made it so easy to understand all the terms and help me decide what would look best for what I wanted. Being able to go and sit with her at her gorgeous home with her fur babies (huuuuuge plus for me) was so calming and much nicer than going into a busy store and feeling rushed to decide. Celeste was so knowledgeable and made me feel at ease that I would get exactly what I wanted and I did truly. I later on added a detail in and I was made to feel like this was normal and not at all a hassle for her. She kept my partner updated at all stages and having a payment plan made it easier to achieve than paying it all in one go. Could not recommend going and customizing your dream ring for whatever the occasion enough. I'm so glad I changed my mind from buying from a store to Celeste. An engagement ring especially is very special and you want the process of designing it to feel that way and Celeste definitely did that. So again, for millionth time, thank you so so much. So so happy with my ring!

Dazzle E.

21:13 06 May 25

I couldn’t be happier with my experience with Hart & Halo. Although everything was handled online, Celeste understood exactly what I had in mind for the engagement ring and brought it to life beautifully. The entire process felt personal, smooth, and easy.

The ring turned out even better than I imagined and made our proposal even more special. Thank you for the exceptional craftsmanship and attention to detail. I highly recommend Hart & Halo to anyone looking for a meaningful and well-crafted piece.

Candace T.

03:12 02 May 25

Super stoked with the total experience and the outcome of my dream come true ring. The whole process from start to finish was a breeze! Communication & options available was excellent - made me feel comfortable in my choices, with no compromise. Highly recommend!

BY OCCASION

BY STYLE

Other Information

Guides

Ring Sizing Guide