Guides

Ring Size Guide

Finding your perfect ring size is a meaningful step in creating a piece that feels truly yours. Whether it’s for an engagement, a gift, or a personal treat, a well-fitting ring brings comfort and confidence. At Keanis, we make the process both simple and precise — with thoughtful tools you can try at home, and expert support just a message away.

How should a ring fit?

Your ring should slide on comfortably and come off with a slight resistance — secure, but never restrictive. It should feel natural on your finger, allowing for daily wear without pinching or slipping.

A simple way to check? Try the shake test: relax your hand by your side, give it a gentle shake, and ensure the ring stays in place without feeling loose.

At Keanis, our Try-On Kit is thoughtfully designed to help you get the perfect fit. It includes not only metal ring sizers, but also sample stone shapes in varying dimensions to see how different designs look and feel on your hand. It’s the first meaningful step in discovering the ring that’s truly right for you.

Tips for the Perfect Fit

Ring sizing is part art, part science. From the hand you measure to the time of day, small factors can make a meaningful difference. These tips will help guide you to a size that feels as good as it looks — secure, comfortable, and truly yours.

Measure the wearing hand

Our dominant hands tend to be slightly larger. Always measure the finger on the hand you intend to wear your ring on for the most accurate fit.
Check at the right time

Fingers can swell or shrink based on temperature and hydration. Measure your finger when your body is at a normal temperature — ideally in the late afternoon or evening.
Account for the knuckle

If you have prominent knuckles, measure both the knuckle and the base of your finger. Choose a size that comfortably fits over the knuckle but isn’t loose when worn.
Mind the band width

Wider bands fit more snugly. If your ring is over 4mm wide, consider sizing up by half a size. For very fine bands (under 1.5mm), you may size down slightly for a more secure fit.
When in doubt, size up

Finger size can fluctuate throughout the day. If you're between sizes, we suggest choosing the larger one for greater ease and comfort.
Remember half sizes

Our ring sizing options include half sizes. If a full size feels slightly tight and the next one up feels too loose, a half size in between is often just right.

Ways to find your ring size at Keanis

Whether you're choosing for yourself or planning a surprise for someone special, we offer several easy and accurate ways to discover your ideal ring size — designed to suit your needs, your timeline, and your style.

01 Quick and convenient

Printable ring sizer

Download Printable Ring Sizer to measure your finger or compare with an existing ring. It's an ideal option for quick estimations — especially if you’re keeping things under wraps.

02 Accurate at home

Keanis try-on-kit

Our Try-On Kit brings the showroom experience to your home. It includes five real metal sizers — your selected size, plus two above and below — to help you find the most comfortable fit, along with two stone shape samples so you can see how your favourites look and feel on your hand.

03 Expert guidance

Book an appointment

For the most confident fit, book a one-on-one appointment with our team. We’ll walk you through sizing in person and offer guidance tailored to your preferred designs and lifestyle.

Average Ring Sizes in the UK

In the UK, women’s ring sizes most often fall between K and N, while men’s typically range from P to T. These averages can offer a helpful starting point — especially if you’re planning a surprise — but it’s worth remembering that every hand is unique, and no two fits are exactly alike. Below, you’ll find a UK ring size chart for reference.

Diameter (mm)

Circumference (mm)

F

14.1

44.2

G

14.5

45.5

H

14.9

46.8

I

15.3

48.0

J

15.5

48.7

K

15.9

50.0

L

16.3

51.2

M

16.7

52.5

N

17.1

53.8

O

17.5

55.1

P

17.9

56.3

Q

18.3

57.6

R

18.8

58.9

S

19.2

60.2

T

19.6

61.4

U

20.0

62.7

Ring Size Conversion

Whether you're gifting from abroad or sizing from a different standard, our conversion chart helps you compare UK, US, and Asian ring sizes with ease. Use this guide to confidently find your match — no matter where in the world you’re sizing from.

US & Canada

China, Japan & Singapore

F

3

4

G

3.5

5

H

4

7

I

4.5

8

J

4.75

8.5

K

5.25

9.5

L

5.75

11

M

6.25

12.5

N

6.75

13.5

O

7.25

14.5

P

7.75

15.5

Q

8.25

16.5

R

8.75

17.5

S

9.25

18.5

T

9.75

19.5

U

10.25

21

More about ring sizing

Traditionally, an engagement ring or a wedding ring is worn on the fourth finger of the left hand, often referred to as the "ring finger." This custom dates back to the ancient belief that a vein in this finger—the "vena amoris" or vein of love — ran directly to the heart.
Of course, traditions can vary by culture and personal preference. Some people choose to wear it on their right hand, especially in different parts of Europe or for practical reasons. There’s no wrong choice — it’s about what feels right for you.
We offer one complimentary resizing within 90 days of collection or delivery for all eligible Keanis rings. We understand that sizing can be tricky — especially if it’s for a surprise proposal — so you're welcome to visit us after the big moment for a professional fit and adjustment.
Please note that resizing is only available for rings made in 18K gold or platinum and typically within three full sizes up or down. Some styles, such as full eternity bands or open bands cannot be resized due to their design. If a ring is non-resizable, we’ll clearly note this on the product page.
After the 90-day complimentary period, ring resizing is available at a standard fee of £50 per adjustment.
Please note that engraved or modified rings are not eligible for free resizing, even within the 90-day window, and will also incur the standard fee.
If you’re unsure about sizing, we’re always happy to offer guidance before or after your purchase.
You can arrange resizing by:

– Emailing us at hello@keanis.co.uk with your order details and desired size, or
– Booking an in-person resizing appointment at our studio.
If you’re returning a ring by post, please note that you’ll need to arrange and cover return postage. We strongly recommend using a tracked and insured service, as Keanis cannot be held responsible for any loss or damage in transit. Be sure to return the ring in its original box or suitable protective packaging.
To achieve your perfect fit, our jewellers carefully add or remove a small strip of metal from the back of the band before seamlessly soldering it back together. The work is so precise, you won’t see any visible sign that the ring has been altered.