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Inches To Ring Size Converter

Created by Joanna Śmietańska, PhD
Reviewed by Adena Benn
Last updated: Apr 14, 2024


Whether you're looking for a ring for your special day or wondering what's your ring size in inches, Omni's handy inches to ring size converter allows you to turn inches of ring size measurements into corresponding common ring sizes. Just read below how to measure ring size in inches, and our tool will convert the results to determine your ring size. Alternatively, you may use the inches to ring size chart below.

How to measure ring size in inches

You can use several ways to measure what ring size you need:

  1. Take a ring mandrel and one of your rings.
  2. Slide the ring on the tool and read the correct ring size from where it stops.

If you don't have a ring mandrel, use a homemade method with a strip of paper or string:

  1. Wrap it around the desired finger.
  2. Mark where the ends meet.
  3. Unwrap your paper or string and measure the marked distance with a ruler. Congratulations, this is your finger circumference.
  4. Divide the result by π (~3.14) to find the inside diameter of your ring.

Inches to ring size chart

Once you have measured the circumference of your finger, you can estimate the ring size using the inches to ring size chart below. This will help you compare your measurement to the standard ring size equivalents, such as the US ring size or UK ring size.

Inside Diameter

Inside Circumference

Sizes

inches

inches

UK & Australia

US & Canada

France

Germany

Japan

Switzerland

0.390

1.22

_

0000

_

_

_

_

0.442

1.39

_

00

_

_

_

_

0.454

1.43

_

0

_

_

_

_

0.474

1.49

A

1/2

_

_

_

_

0.487

1.53

B

1

_

_

1

_

0.503

1.58

C

1 1/2

_

_

_

_

0.520

1.63

D

2

41 1/2

13 1/2

2

1 1/2

0.536

1.68

E

2 1/2

42 3/4

13 3/4

3

2 3/4

0.553

1.74

F

3

44

14

4

4

0.565

1.77

G

3 3/8

45 1/4

_

5

5 1/4

0.569

1.79

G 1/4

3 1/2<

_

14 1/2

_

_

0.573

1.80

G 1/2

3 5/8

_

_

6

_

0.577

1.81

H

3 3/4

46 1/2

_

_

6 1/2

0.585

1.84

H 1/2

4

_

15

7

_

0.592

1.86

I

4 1/4

47 3/4

_

_

7 3/4

0.601

1.89

I 1/2

4 1/2

_

15 1/4

8

_

0.606

1.90

J

4 5/8

49

15 1/2

_

9

0.618

1.94

J 1/2

5

_

15 3/4

9

_

0.622

1.95

K

5 1/8

50

_

_

10

0.630

1.98

K 1/2

5 3/8

_

10

_

0.634

1.99

L

5 1/2

51 3/4

16

_

11 3/4

0.650

2.04

M

6

52 3/4

16 1/2

12

12 3/4

0.666

2.09

N

6 1/2

54

17

13

14

0.683

2.15

O

7

55 1/4

17 1/4

14

15 1/4

0.699

2.20

P

7 1/2

56 1/2

17 3/4

15

16 1/2

0.716

2.25

Q

8

57 3/4

18

16

17 3/4

0.729

2.29

Q 3/4

8 1/2

_

18 1/2

17

_

0.733

2.30

R

8 5/8

59

_

_

19

0.748

2.35

R 3/4

9

_

19

18

_

0.752

2.36

S

9 1/8

60 1/4

_

_

20 1/4

0.764

2.40

S 3/4

9 1/2

_

19 1/2

19

_

0.768

2.41

T

9 5/8

61 1/2

_

_

21 1/2

0.781

2.45

T 1/2

10

_

20

20

_

0.788

2.48

U

10 1/4

62 3/4

_

21

22 3/4

0.797

2.50

U 1/2

10 1/2

_

20 1/4

22

_

0.800

2.51

V

10 5/8

63

_

_

23 3/4

0.814

2.56

V 1/2

11

_

20 3/4

23

_

0.817

2.57

W

11 1/8

65

_

_

25

0.830

2.61

W 3/4

11 1/2

_

21

24

_

0.834

2.62

X

11 5/8

66 1/4

_

_

26 1/4

0.846

2.66

Y

12

67 1/2

21 1/4

25

27 1/2

0.862

2.71

Z

12 1/2

68 3/4

21 3/4

26

28 3/4

0.879

2.76

Z+1

13

_

22

27

_

0.906

2.85

_

14

_

_

_

_

0.938

2.95

_

15

_

_

_

_

0.954

3.00

_

15 1/2

_

_

_

_

For example, let us convert 3 inches to ring size. Using the inches to ring size chart, we can switch from a circumference of 3 inches to a ring size of 15 1/2.

How to use this inches to ring size converter

Our free inches to ring size converter will help you determine your ring size in inches in both circumference and diameter by using the following steps:

  1. Measure the finger circumference or inside diameter of your ring. Let's assume you need to convert a circumference of 2.5 inches to ring size.
  2. Enter the data into the relevant field.
  3. The inches to ring size converter will return the corresponding ring size in different scales. We converted the circumference of 2.5 inches to a ring size of 10 1/2.
  4. In the opposite way, choose the ring size and get the circumference, diameter, and size equivalents in other countries.

Our similar tools

Here's our entire collection of ring size conversion tools:

FAQ

What ring size is equivalent to 2 1/4 inches?

A 2 1/4-inch circumference is the equivalent of a US size 8 ring. To find it:

  1. Convert 2 1/4 inches of circumference to 2.25.
  2. Use the inches-to-ring size chart to convert between inches and the standard ring sizes.

What UK ring size is equivalent to 2 inches?

The ring with a 2-inch circumference corresponds to a size L ring in the UK. The equivalents of this ring size in other scales are 5 1/2 (US), 51 3/4 (France and Russia), 16 (Germany), and 11 3/4 (Switzerland).

Joanna Śmietańska, PhD
Measurements
Inside diameter
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in
Inside circumference
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in
Ring size equivalents
US & Canada
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UK & Australia
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France & Russia
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Germany
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Switzerland
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Japan
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