AU to Canada Ring Size Conversion – Australian to Canadian Ring Sizes

AU to Canada Ring Size Conversion

Convert Australian ring sizes to Canadian (US) ring sizes instantly — complete chart from Size A to Z+3 with diameter, circumference, and a free calculator

🇦🇺 Australian Sizes A – Z+3 🇨🇦 Canadian / US Sizes 📐 mm Measurements 🔄 Instant Converter 🏠 Measure at Home

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AU Average
Women's Size

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Canadian Average
Women's Size

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Total Sizes
in Chart

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Canada Uses
US Sizing

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AU to Canada Ring Size Converter

Select your Australian ring size to instantly get your Canadian (US) size

Your Canadian (US) Ring Size

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Ring Size Calculator

Enter your finger measurement to find both your AU and Canadian ring size

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Complete AU to Canada Ring Size Chart

🇦🇺 AU / UK Size	🇨🇦 Canada (US) Size	Diameter (mm)	Circumference (mm)	Typical Wearer
A	0.5	12.0 mm	37.8 mm	Child
B	1	12.3 mm	38.6 mm	Child
C	1.5	12.5 mm	39.3 mm	Child
D	2	12.8 mm	40.0 mm	Child
E	2.5	13.0 mm	40.8 mm	Child
F	3	13.2 mm	41.5 mm	Child
G	3.5	13.5 mm	42.3 mm	Small Women
H	4	13.7 mm	43.0 mm	Small Women
I	4.25	13.9 mm	43.8 mm	Women
J	4.75	14.2 mm	44.5 mm	Women
K	5.25	14.4 mm	45.3 mm	Women
L	5.5	14.6 mm	46.0 mm	Women
M	6	14.9 mm	46.8 mm	Popular ♀
N ⭐	6.5	15.1 mm	47.5 mm	Most Common ♀
O	7	15.3 mm	48.3 mm	Popular ♀
P	7.75	15.6 mm	49.0 mm	Women / Men
Q	8.25	15.8 mm	49.8 mm	Women / Men
R	8.75	16.1 mm	50.5 mm	Men
S	9.25	16.3 mm	51.3 mm	Men
T ⭐	9.75	16.6 mm	52.0 mm	Most Common ♂
U	10.25	16.8 mm	52.8 mm	Popular ♂
V	10.75	17.0 mm	53.5 mm	Men
W	11.25	17.3 mm	54.3 mm	Men
X	11.75	17.5 mm	55.0 mm	Large Men
Y	12.25	17.8 mm	55.8 mm	Large Men
Z	12.75	18.0 mm	56.5 mm	Large Men
Z+1	13.25	18.2 mm	57.3 mm	XL
Z+2	13.5	18.5 mm	58.0 mm	XL
Z+3	14	18.7 mm	58.8 mm	XL

⭐ AU Size N = Canadian Size 6.5 (Most common women's)

⭐ AU Size T = Canadian Size 9.75 (Most common men's)

🇨🇦 Canada uses the same sizing as the US

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Quick Reference — Popular Sizes

🇦🇺 AU Size	🇨🇦 Canada Size	Diameter (mm)	Best For
L	5.5	14.6 mm	Women
M	6	14.9 mm	Popular ♀
N ⭐	6.5	15.1 mm	Most Common ♀
O	7	15.3 mm	Popular ♀
P	7.75	15.6 mm	Unisex
Q	8.25	15.8 mm	Unisex
R	8.75	16.1 mm	Men
S	9.25	16.3 mm	Men
T ⭐	9.75	16.6 mm	Most Common ♂
U	10.25	16.8 mm	Popular ♂

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How to Measure Your Ring Size at Home

Method 1 — Paper / String (Most Accurate)

Cut a thin strip of paper

About 1 cm wide and 10 cm long. A piece of string or thread also works perfectly.

Wrap around your finger

Wrap snugly around the base of the finger, ensuring it passes comfortably over the knuckle.

Mark the overlap point

Use a pen to mark exactly where the strip meets — this length equals your finger circumference.

Measure in millimetres

Lay the strip flat on a ruler and record the length in mm, then enter it in the calculator above.

Match to the chart

Find the closest value in the Circumference (mm) column to get your AU size, then read the Canadian size alongside it.

Method 2 — Measure an Existing Ring

Choose a ring that fits well

Select a ring that comfortably fits the finger you want to size.

Measure the inner diameter

Use a ruler to measure straight across the inside opening of the ring in millimetres.

Match to the chart above

Find that measurement in the Diameter (mm) column to get your AU size, and the matching Canadian size.

📐 Conversion Formulas

Diameter → Circumference

Circumference (mm) = Diameter (mm) × 3.14159

Example: 15.1 mm × 3.14159 = 47.4 mm → AU Size N → Canadian Size 6.5

Inches → Millimetres

mm = inches × 25.4

Example: 0.594″ × 25.4 = 15.1 mm → AU Size N → Canadian Size 6.5

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Tips for Accurate Ring Sizing

🌡️Measure at the right time: Fingers are slightly larger in the evening and when warm. Avoid measuring first thing in the morning or after exercise.
📏Measure the correct finger: Ring sizes can differ between fingers and hands. Always measure the specific finger you plan to wear the ring on.
🔁Measure 3 times: Take three separate measurements and use the average for the most accurate result.
⬆️Go up if between sizes: If your measurement falls between two AU sizes, always choose the larger Canadian size for comfort.
💧Wide bands fit tighter: If buying a wide band ring (more than 6mm), go up half a Canadian size as wide bands sit tighter on the finger.
🇨🇦Canada = US sizing: Canadian jewellers use the exact same sizing system as the United States. A Canadian size 7 is identical to a US size 7.

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Understanding the Two Systems

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Australian / UK System

Uses letters A to Z+3. Shared with the UK and Ireland. Each half-letter step equals roughly 0.4 mm in diameter.

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Canadian / US System

Uses numbers from 0 to 16 in 0.25 increments. Canada and the US use identical sizing — no conversion needed between the two countries.

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Why Sizes Don't Match Perfectly

AU letter sizes and Canadian number sizes don't always align at exact 0.5 steps, so always cross-reference with the diameter in mm for precision.

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Frequently Asked Questions

Is Canadian ring sizing the same as US ring sizing? ▼

Yes. Canada uses the exact same ring size numbering system as the United States. A Canadian size 7 is identical to a US size 7. There is no conversion needed between the two countries.

What is Australian size N in Canadian sizing? ▼

Australian size N converts to Canadian (US) size 6.5. Size N is the most common women's ring size in Australia, with a diameter of 15.1 mm and a circumference of approximately 47.5 mm.

What is Australian size T in Canadian sizing? ▼

Australian size T converts to Canadian (US) size 9.75. This is the most popular men's ring size in Australia, with a diameter of 16.6 mm and a circumference of 52.0 mm.

Why don't AU and Canadian sizes align perfectly? ▼

The two systems were developed independently using different measurement increments. Australian/UK sizes use letters with roughly 0.4 mm increments, while Canadian/US sizes use numbers with 0.4–0.8 mm increments. Some AU sizes land between two Canadian sizes, so always refer to the diameter in mm for the most accurate match.

Should I order a half size up when buying online from Canada? ▼

If your converted size falls between two Canadian sizes, it's generally safer to order the half size up, especially for comfort-fit bands. Wide bands (over 6 mm) should also be ordered half a size larger than your measured size.

Can I use this chart for UK to Canadian conversion too? ▼

Yes. Australian and UK ring sizes use the exact same lettering system (A to Z+3), so this chart works perfectly for UK to Canadian conversions as well.