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

Canada to AU Ring Size Conversion

Convert Canadian (US) ring sizes to Australian ring sizes instantly — complete chart with half sizes, diameter in mm, circumference, and a free size calculator

🇨🇦 Canadian Sizes 3 – 13.5 🇦🇺 AU / UK Letter Sizes 📐 mm Measurements ½ Half Sizes Included 🔄 Instant Converter

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6½

Avg Canadian
Women's Size

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Avg AU
Women's Size

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Total Sizes
in Chart

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=US

Canada Uses
US Sizing

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Canada to AU Ring Size Converter

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

Your Australian (AU) Ring Size

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Complete Canada to AU Ring Size Chart

🇨🇦 Canada (US) Size	🇦🇺 AU / UK Size	Diameter (mm)	Circumference (mm)	Typical Wearer
3 3/8	G	14.36 mm	45.1 mm	Child / XS
3 5/8	G½	14.56 mm	45.7 mm	Child / XS
3 3/4	H	14.65 mm	46.0 mm	Child / XS
4	H½	14.86 mm	46.7 mm	Small Women
4 1/4	I	15.04 mm	47.3 mm	Small Women
4 1/2	I½	15.27 mm	48.0 mm	Women
4 5/8	J	15.40 mm	48.4 mm	Women
5	J½	15.70 mm	49.3 mm	Women
5 1/8	K	15.80 mm	49.6 mm	Women
5 3/8	K½	16.00 mm	50.3 mm	Women
5 1/2	L	16.10 mm	50.6 mm	Popular ♀
5 7/8	L½	16.41 mm	51.6 mm	Popular ♀
6	M	16.51 mm	51.9 mm	Popular ♀
6 1/4	M½	16.71 mm	52.5 mm	Popular ♀
6 1/2 ⭐	N	16.92 mm	53.2 mm	Most Common ♀
6 3/4	N½	17.13 mm	53.8 mm	Popular ♀
7	O	17.35 mm	54.5 mm	Women / Men
7 1/4	O½	17.45 mm	54.8 mm	Women / Men
7 1/2	P	17.75 mm	55.8 mm	Women / Men
7 3/4	P½	17.97 mm	56.5 mm	Women / Men
8	Q	18.19 mm	57.2 mm	Men
8 1/4	Q½	18.35 mm	57.7 mm	Men
8 5/8	R	18.61 mm	58.5 mm	Men
8 7/8	R½	18.80 mm	59.1 mm	Men
9 1/8	S	19.10 mm	60.0 mm	Men
9 3/8	S½	19.31 mm	60.7 mm	Men
9 5/8 ⭐	T	19.51 mm	61.3 mm	Most Common ♂
10	T½	19.84 mm	62.3 mm	Popular ♂
10 1/4	U	20.02 mm	62.9 mm	Men
10 1/2	U½	20.20 mm	63.5 mm	Men
10 5/8	V	20.32 mm	63.8 mm	Men
11	V½	20.68 mm	65.0 mm	Men
11 1/8	W	20.76 mm	65.2 mm	Men
11 3/8	W½	20.94 mm	65.8 mm	Large Men
11 5/8	X	21.18 mm	66.5 mm	Large Men
11 7/8	X½	21.30 mm	66.9 mm	Large Men
12	Y	21.49 mm	67.5 mm	Large Men
12 1/4	Y½	21.69 mm	68.1 mm	Large Men
12 1/2	Z	21.89 mm	68.8 mm	XL
12 3/4	Z+½	22.10 mm	69.4 mm	XL
13	Z+1	22.33 mm	70.2 mm	XL
13 1/2	Z+1.5	22.60 mm	71.0 mm	XL

⭐ Canadian 6½ = AU Size N (Most common women's)

⭐ Canadian 9 5/8 = AU Size T (Most common men's)

½ Half sizes included for precision

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Quick Reference — Popular Sizes

🇨🇦 Canada Size	🇦🇺 AU Size	Diameter (mm)	Best For
5 1/2	L	16.10 mm	Popular ♀
6	M	16.51 mm	Popular ♀
6 1/2 ⭐	N	16.92 mm	Most Common ♀
7	O	17.35 mm	Unisex
7 1/2	P	17.75 mm	Unisex
8	Q	18.19 mm	Men
8 5/8	R	18.61 mm	Men
9 1/8	S	19.10 mm	Men
9 5/8 ⭐	T	19.51 mm	Most Common ♂
10	T½	19.84 mm	Popular ♂

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How to Measure Your Ring Size at Home

Method 1 — Paper Strip (Most Accurate)

Cut a thin strip of paper

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

Wrap around your finger

Wrap snugly around the base of the finger, making sure it slides comfortably over the knuckle.

Mark the overlap point

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

Measure in millimetres

Lay the strip flat on a ruler and record the length. Enter it into the chart's Circumference column to find your AU size.

Convert to Canadian size

Find your AU letter size in the chart above and read the matching Canadian number size alongside it.

Method 2 — Measure an Existing Ring

Choose a well-fitting ring

Select a ring that sits comfortably on the intended finger — not too tight and not too loose.

Measure the inner diameter

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

Find your sizes in the chart

Match the diameter reading to the Diameter (mm) column above to find both your AU and Canadian ring size.

📐 Conversion Formulas

Diameter → Circumference

Circumference (mm) = Diameter (mm) × 3.14159

Example: 16.92 mm × 3.14159 = 53.2 mm → AU Size N → Canadian Size 6½

Inches → Millimetres

mm = inches × 25.4

Example: 0.666″ × 25.4 = 16.92 mm → AU Size N → Canadian Size 6½

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Understanding the Two Systems

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Canadian / US System

Uses numbers (e.g. 6, 6½, 7) in quarter and eighth increments. Canada and the US use the exact same ring sizing — no conversion needed between them.

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Australian / UK System

Uses letters A to Z+3, plus half sizes (e.g. G½, N½). Australia and the UK use the same lettering system, so this chart works for UK to Canadian conversions too.

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Why Half Sizes Matter

Canadian sizes use fine increments of ⅛ to ¼, so many AU letter sizes map to fractional Canadian sizes. Always cross-reference with diameter in mm for the most precise fit.

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Tips for Accurate Ring Sizing

🌡️Measure at room temperature: Fingers swell in heat and shrink in cold. Always measure indoors at normal room temperature for the most accurate result.
⏰Measure in the evening: Fingers are slightly larger in the evening due to daily fluid retention. This gives you a size that remains comfortable all day.
🔁Measure 3 times: Take three separate measurements and use the average. This reduces errors from inconsistent wrapping.
⬆️Go up if between sizes: If your measurement sits between two Canadian sizes, always choose the larger one for everyday comfort.
💎Wide bands fit tighter: Bands wider than 6 mm sit snugger on the finger. Order half a Canadian size up when buying a wide band style.
🇨🇦Canada = US sizing: If you know your US ring size, it is identical to your Canadian size. Simply use the same number in this chart to find your AU equivalent.

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Frequently Asked Questions

What is Canadian size 6½ in Australian sizing? ▼

Canadian size 6½ converts to Australian size N. This is the most common women's ring size in both Australia and Canada. It has a diameter of 16.92 mm and a circumference of approximately 53.2 mm.

What is Canadian size 9 5/8 in Australian sizing? ▼

Canadian size 9 5/8 converts to Australian size T — the most common men's ring size in Australia. It has a diameter of 19.51 mm and a circumference of 61.3 mm.

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. This chart works equally well for US to AU conversions.

Why do Canadian sizes have fractions like 4 5/8 or 8 7/8? ▼

The Canadian/US system uses very fine increments — typically ¼ or ⅛ of a size — to match the small physical differences between AU letter sizes. This is why many AU half-sizes (like G½ or R½) correspond to fractional Canadian numbers. Always use the diameter in mm to confirm accuracy.

Does this chart also work for UK to AU conversions? ▼

Yes. The AU (Australian) and UK ring size systems are identical — both use letters A to Z+3. So the AU sizes listed in this chart apply directly for UK sizing as well.

What if my size falls between two AU sizes? ▼

If your finger measurement lands between two AU sizes, always choose the larger size for comfort. Many AU half-sizes (e.g. N½, P½) exist precisely for this reason. A local Australian jeweller can size your finger with a professional ring mandrel for the most precise result.