Ring Size Chart

  • Alex Wong Jewellery - Trusted 3rd Generation Jeweller Since 1950.

    Written By Alex Wong.
    Last updated: 14 Oct 2024.

Once you've chosen your preferred ring design, it's crucial to determine the ring size that will fit your finger comfortably. Below, we present a ring conversion table and 3 methods for discreetly measuring ring size.

Rings of different sizes: Size 6, 15 and 23.
Note: Rings not illustrated to scale.

Ring Size Conversion Table

Inter-Diameter (mm) HK Size US Size UK Size JP Size CH Size
14.1 6 3 F 4 4
14.3 7 3.25 F 1/2 5 5.25
14.7 8 3.75 G 6 6.5
14.9 9 4 H 7 7
15.3 10 4.5 I 8 8.5
15.7 11 5 J 1/2 9 9.5
16.1 12 5.5 K 1/2 10 10.5
16.5 13 6 L 1/2 11 12.75
16.7 14 6.25 M 12 13.5
17.1 15 6.75 N 13.5 14.5
17.3 16 7 N 1/2 14 15.25
17.7 17 7.5 O 1/2 15 16.5
18.2 18 8 P 1/2 16.25 18.25
18.5 19 8.5 Q 1/2 17 18.75
18.8 20 9.75 R 17.5 19
19.1 21 9.25 S 18 20
19.4 22 9.5 S 1/2 19 20.75
19.8 23 10 T 1/2 20 21.75
20.2 24 10.5 U 1/2 22 22.75
20.6 25 11 V 1/2 23 24.75
21.0 26 11.5 W 1/2 24 26.25
21.2 27 12 X 24.5 26.75
21.6 28 12.25 Y 25.5 28
22.0 29 12.5 Z 1/2 26.5 29

How to Measure a Ring in Secret

Purchasing an engagement ring or a surprise present for your significant other? Below are our top recommendations for discreetly determining their ring size.


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When scheduling your visit, please share your preferences and budget with us. We are dedicated to providing tailored recommendations and are eager to assist you in selecting the ideal gift.

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Alex Wong Jewellery is proud to donate a jewellery set to the Singapore Council of Women’s Organisations (SCWO).

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