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Ring Size Australia: Australian Ring Size Chart + US Conversion

Buying a ring online in Australia is easy once you know your size. Australian ring sizes use letters (G through Z+), which are different from the US numerical system and the European millimetre system. This guide explains how to measure your ring size at home, includes a full Australian ring size chart with millimetre measurements, and shows you how to convert between Australian, US, and UK ring sizes.

Australian Ring Size Chart

The table below shows Australian ring sizes from G (smallest common size) through Z, with the corresponding inside diameter in millimetres, circumference in millimetres, and the US ring size equivalent.

AU Size Diameter (mm) Circumference (mm) US Size
G 14.9 46.8 4
H 15.3 48.0 4.5
I 15.7 49.3 5
J 16.1 50.6 5.25
K 16.5 51.8 5.5
L 16.9 53.1 6
M 17.3 54.4 6.25
N 17.7 55.6 6.5
O 18.1 56.9 7
P 18.5 58.1 7.5
Q 18.9 59.4 8
R 19.3 60.6 8.5
S 19.7 61.9 9
T 20.2 63.4 9.5
U 20.6 64.7 10
V 21.0 66.0 10.5
W 21.4 67.2 11
X 21.8 68.5 11.5
Y 22.2 69.7 12
Z 22.6 71.0 12.5

How to Find Your Ring Size at Home

There are three reliable methods for measuring your ring size without visiting a jeweller. For the most accurate result, measure in the evening when fingers are slightly larger, and avoid measuring when hands are cold.

Method 1: Measure an Existing Ring

If you already own a ring that fits the finger you want to size, this is the easiest method.

  1. Place the ring on a flat surface.
  2. Use a ruler or vernier callipers to measure the inside diameter of the ring in millimetres (across the inside of the circle from one edge to the other).
  3. Find your measurement in the diameter column of the chart above to confirm your Australian ring size.

Method 2: Paper or String Method

This method works when you do not have an existing ring to measure.

  1. Cut a thin strip of paper (about 5 mm wide) or use a piece of string.
  2. Wrap it snugly around the base of the finger you want to size. It should be comfortable, not tight.
  3. Mark where the paper or string overlaps to complete the circle.
  4. Lay it flat against a ruler and measure the length in millimetres. This is the circumference of your finger.
  5. Find your circumference in the chart above to identify your Australian ring size.


Repeat the measurement two or three times to confirm. If your measurement falls between two sizes, choose the larger size for comfort.

Method 3: Ring Sizer Tool

A plastic ring sizer is a set of plastic rings in every size from G to Z. You try each one until you find the size that slips over the knuckle and sits comfortably at the base of the finger. Ring sizers are available from most jewellers and online. They are the most accurate at-home method, particularly for people whose knuckles are significantly wider than the base of the finger.

Average Ring Size for Women in Australia

The average ring size for women in Australia is M to N, which corresponds to approximately US size 6 to 6.5 and an inside diameter of 17.3 to 17.7 mm. Ring sizes M and N are the most commonly ordered sizes for women and are a useful starting point when buying a ring as a surprise gift.

Keep in mind that ring size varies by finger. The average ring size for a left-hand ring finger is typically one size smaller than the right-hand ring finger for most people. Index and middle fingers tend to be slightly larger than the ring finger.

Average Ring Size for Men in Australia

The average ring size for men in Australia is T to U, which corresponds to approximately US size 9.5 to 10 and an inside diameter of 20.2 to 20.6 mm. Men with larger hands or fingers may size up to V or W. Men with smaller hands may be closer to R or S.

Australian to US Ring Size Conversion

If you are shopping from an international store or comparing sizes across regions, use this quick reference to convert between Australian and US ring sizes:

AU Size US Size AU Size US Size
G 4 P 7.5
H 4.5 Q 8
I 5 R 8.5
J 5.25 S 9
K 5.5 T 9.5
L 6 U 10
M 6.25 V 10.5
N 6.5 W 11
O 7 Z 12.5

Note: Australian and UK ring sizes use the same letter-based system, so an AU size M is the same as a UK size M. The main conversion you will need is AU/UK to US when shopping internationally.

Average Ring Size for Women in Australia

Measure in
the evening

Fingers swell slightly throughout the day, especially in warm weather. Measuring in the evening gives you the largest size your finger will be, which means the ring will always be comfortable to put on.

Measure the
right hand separately

Your dominant hand is often half a size larger than your non-dominant hand. If you are buying for the right hand, measure the right hand.

Account for
knuckle size

If your knuckle is significantly wider than the base of your finger, size up so the ring passes over the knuckle, then get the ring adjusted by a jeweller to fit the base more snugly if needed.

Wide bands
fit tighter

A band wider than 6 mm will feel tighter than a slim band of the same diameter. If you are buying a wide band, go up half a size from your standard measurement.

When in doubt,
size up

A ring that is slightly large is easier for a jeweller to resize smaller than a ring that is too tight.

Browse our ring collection.

All rings are listed with their available sizes. If you need a specific size that is not shown, contact us and we can check availability.