Rings of Australia - Ring Size Guide

Your engagement ring or wedding band is something you'll wear every day for the rest of your life. Getting the size right from the start means it goes straight onto your finger the moment it arrives, no waiting, no back-and-forth. Use this guide to measure accurately at home in minutes using three straightforward methods.

Why Ring Size Matters

A well-fitted ring sits naturally at the base of the finger, secure enough not to wander, comfortable enough that you stop noticing it within minutes of putting it on. Ordering the wrong size means your ring needs to be adjusted before you can wear it, and for intricate engagement ring settings, repeated resizing carries a small risk to prong and setting integrity. Every Rings of Australia order includes a complimentary resizing service, but getting the right measurement up front means your ring is on your finger from the day it arrives.

How to Measure Your Ring Size

Method 1: Paper Strip or String

What you need: A thin strip of paper or non-stretchy string, a pen, and a ruler.

Steps:

1. Cut a strip of paper approximately 6mm wide and 15cm long, or use a piece of dental floss or a thin string.

2. Wrap it snugly around the base of the finger you intend to wear the ring on, not the knuckle.

3. Mark exactly where the strip completes a full circle and overlaps.

4. Lay the strip flat against a ruler and measure from the end to your mark in millimetres. This is your finger's circumference.

5. Match that measurement to the circumference column in the size chart below.

Tip:

Measure in the afternoon or early evening when your fingers are naturally at their fullest. Take two or three readings across separate occasions and use the average. Australia's warmer climate means fingers can run larger on a hot day, so measure indoors at a comfortable temperature for the most consistent result.

Method 2: Measure an Existing Ring

The most practical approach is when buying a surprise gift.

What you need: A ring that already fits the intended finger well, and a ruler or digital calipers.

Steps:

1. Select a ring your partner wears on the correct finger, ideally a plain band, as it gives the clearest internal measurement.

2. Place the ring on a flat surface and measure straight across the inner opening from edge to edge in millimetres. Measure the inside diameter only, not the outer edge.

3. Match your diameter reading to the "Diameter (mm)" column in the chart below to find the corresponding AU/UK size.

Tip:

Digital calipers give the most precise reading and are available at most Australian hardware stores for under $20. If you're using a standard ruler, measure twice and average the two results.

Method 3: Printable Ring Sizer (Most Accurate)

The most reliable at-home method for a first-time measurement.

Steps:

1. Download our free printable ring sizer PDF. Open the file in Adobe Reader or Preview, do not use "fit to page" or any auto-scaling option.

2. Print at exactly 100% scale. Before using it, verify accuracy by holding a ruler against the printed measurement bar - the 25mm marker should align precisely.

3. Place a ring you already wear over the printed circles on the sheet. The circle whose inner printed edge lines up with the inner edge of your ring indicates your size.

4. Alternatively, cut out the paper strip at the bottom of the sheet, wrap it around your finger, and read your AU size where the strip overlaps the printed scale.

Ring Size Chart - AU, US, EU & Metric

Use your circumference or diameter measurement to find your AU/UK size. The same chart applies to engagement rings, wedding bands, and dress rings - sizing is universal across all Rings of Australia styles.

AU / UK Size	US Size	EU Size	Diameter (mm)	Circumference (mm)
H	3¾	46.5	14.9	46.8
I	4	47.0	15.1	47.4
J	4½	48.0	15.3	48.0
K ★	5	49.0	15.7	49.3
L	5½	50.0	16.1	50.6
M ★	6	51.5	16.5	51.8
N ★	6½	52.5	16.7	52.5
O	7	54.0	17.3	54.4
P	7½	55.0	17.7	55.6
Q	8	56.5	18.0	56.6
R	8½	57.5	18.4	57.8
S ★	9	59.0	18.9	59.4
T ★	9½	60.0	19.2	60.3
U ★	10	61.5	19.6	61.6
V	10½	62.5	20.0	62.8
W	11	64.0	20.4	64.1
X	11½	65.0	20.8	65.3
Y	12	66.5	21.2	66.6
Z	12½	67.5	21.6	67.8
Z+1	13	69.0	22.0	69.1

Most common sizes in Australia

Note: If your measurement falls between two sizes, select the larger of the two. For bands wider than 6mm, including most men's wedding bands, go half a size up from your measured reading to ensure a comfortable fit throughout the day. AU and UK ring sizes are identical; if you've been sized anywhere in the UK or New Zealand, that letter applies directly to your order.

Expert Tips for an Accurate Fit

Measure in the afternoon.

Fingers are at their smallest first thing in the morning and swell gradually throughout the day. A mid-to-late afternoon reading gives the most representative result for everyday wear.

Factor in the Australian climate.

Heat causes fingers to expand noticeably. On a warm summer's day, your finger can temporarily run half a size larger than usual. Measure indoors at a neutral temperature, not after time in the sun, a hot shower, or physical exercise.

Measure the right hand.

Your dominant hand tends to be fractionally larger than your other hand. Always measure the specific hand and finger you intend to wear the ring on, as finger sizes can vary across both hands.

Buying for a surprise proposal?

Borrow a ring your partner wears on their ring finger, measure the inner diameter, and cross-reference the chart above. When there's genuine uncertainty, order a size larger - resizing down is always simpler than resizing up, especially on settings with side stones or pavé detailing.

Measure in the afternoon.

Any band wider than 6mm sits higher on the finger and presses against more surface area, making it feel tighter than a slim solitaire of the same size. For wider styles, size up by half a letter from your measured size.

Measure in the afternoon.

Request our complimentary postal sizer kit, and we'll send it to any Australian address, free of charge, so you can confirm your exact letter size before ordering.

Ring Size FAQs

What if my ring doesn’t fit when it arrives?

If your ring doesn’t fit we offer One Free Resize for engagement and wedding rings to use within the first 12 months of your ring's completion (subject to eligible design style/metal type). For full resizing details please visit our detailed page here.

Can I get my ring size checked in your showroom?

Of course! Book an appointment OR Visit our Office

How can I secretly know my partner's ring size?

This is a hard one! But we have a few tips and tricks for you over on this page.

What should I do if I'm in between ring sizes?

If you are between sizes we recommend going up to the nearest size. This will allow for some room in warmer weather.

Does resizing weaken the ring?

The resizing process involves carefully adding or removing a small amount of precious metal to achieve the perfect fit. While resizing a ring too many sizes up or down can affect its structural integrity, we follow safe resizing thresholds to avoid this.

At Rings of Australia, our expert jewellers maintain high quality standards to ensure your ring stays strong and secure. Every resized ring is cleaned and polished before it’s returned to you — so it looks as good as new.

What is the most common engagement ring size?

The most common ring size is between K and P. If you measure your size and fall outside of this range we recommend double checking your ring size with another method to ensure it is correct as most rings can only be resized by a limited amount.

Please refer to the distribution graph below showing the most common ring sizes.