Canadian ring size chart basics and why it mirrors the US scale
Canadian jewelers use the US numeric scale, and the measurements below come from the US/Canada column of our homepage conversion table. Each full size shifts about 0.4mm in diameter or 1.25mm in circumference, so a size 7 in Montreal matches the 17.3mm shown in our main tool.
That consistency makes it easy to translate your Canadian number to UK, EU, or Japanese standards.
US/Canada numeric scale explained
The Canadian system starts at size 0000 for children and moves through full and half sizes into the teens for larger men's bands. Most adults wear size 4 to 13, and the linear increments make it simple to translate the numbers into circumference or diameter when you only have a ruler.
How Canadian half sizes translate to millimeters
Half sizes increase the inside diameter by about 0.2mm and the circumference by about 0.65mm. For example, size 6 measures 16.5mm in diameter while size 6.5 measures 16.9mm. Jewelers across Calgary, Ottawa, and Halifax stock half sizes as standard inventory.
Using circumference vs diameter when ordering online
Most online Canadian jewelers publish both inside diameter and circumference. If you only have a flexible tape measure, circumference is faster; if you have an existing ring, diameter is more reliable.
Complete Canadian ring size chart and mm conversions
These measurements come straight from the US/Canada column of our homepage conversion chart. Use them to verify sizing before purchasing from Canadian or US retailers.
US & Canada ring size to millimeter conversion table
| US/Canada Size | Inside Diameter (mm) | Inside Diameter (inches) | Inside Circumference (mm) | Inside Circumference (inches) |
|---|---|---|---|---|
| 3 | 14.1 | 0.55 | 44.2 | 1.74 |
| 3.5 | 14.5 | 0.57 | 45.5 | 1.79 |
| 4 | 14.9 | 0.58 | 46.8 | 1.84 |
| 4.5 | 15.3 | 0.60 | 48.0 | 1.89 |
| 5 | 15.7 | 0.62 | 49.3 | 1.94 |
| 5.5 | 16.1 | 0.63 | 50.6 | 1.99 |
| 6 | 16.5 | 0.65 | 51.9 | 2.04 |
| 6.5 | 16.9 | 0.67 | 53.1 | 2.09 |
| 7 | 17.3 | 0.68 | 54.4 | 2.14 |
| 7.5 | 17.7 | 0.70 | 55.7 | 2.19 |
| 8 | 18.1 | 0.71 | 57.0 | 2.24 |
| 8.5 | 18.5 | 0.73 | 58.3 | 2.29 |
| 9 | 18.9 | 0.75 | 59.5 | 2.34 |
| 9.5 | 19.4 | 0.76 | 60.8 | 2.39 |
| 10 | 19.8 | 0.78 | 62.1 | 2.44 |
| 10.5 | 20.2 | 0.79 | 63.4 | 2.49 |
| 11 | 20.6 | 0.81 | 64.6 | 2.54 |
| 11.5 | 21.0 | 0.83 | 65.9 | 2.59 |
| 12 | 21.4 | 0.84 | 67.2 | 2.64 |
| 12.5 | 21.8 | 0.86 | 68.5 | 2.69 |
| 13 | 22.2 | 0.87 | 69.7 | 2.74 |
| 13.5 | 22.6 | 0.89 | 71.0 | 2.79 |
| 14 | 23.0 | 0.91 | 72.3 | 2.84 |
| 14.5 | 23.4 | 0.92 | 73.6 | 2.89 |
| 15 | 23.8 | 0.94 | 74.8 | 2.94 |
How to measure your ring size in Canada
Measure at normal body temperature, account for your knuckle, and use these quick steps that mirror Canadian jeweler guidance.
Professional measuring options
Local jewelers across Canada use calibrated mandrels and ring sizer sets marked in the US/Canada numeric system. Ask for both diameter and circumference so you can double-check the chart.
Jewelers' mandrel and calibrated ring sticks
A jeweler slides your ring onto a metal mandrel to read the exact Canadian size within seconds.
When to size up for cold-prone fingers
If your fingers shrink in sub-zero winters or with wide bands, choose the higher half size so the ring still passes the knuckle.
Metal-specific sizing advice for Canadian buyers
Platinum and titanium bands are harder to resize, so confirm your Canadian size twice—once in cooler weather and once indoors.
At-home measurement walkthrough
Size yourself with simple tools and compare to the millimeter numbers above. Repeat measurements at different times of day for accuracy.
String and paper wrap method for accurate mm readings
Wrap a paper strip around the base of your finger, mark the overlap, and measure the length in millimeters. Compare the value to the circumference column—for example, 55.7mm aligns with Canadian size 7.5. Print our printable ring sizer at 100% scale for an easy template.
Digital caliper check for existing rings
Measure the inside diameter of a ring that already fits. A 16.9mm diameter equals Canadian size 6.5, while 18.9mm equals size 9.
Glove-size cross-check for quick estimates
If you only know your glove size, use quick averages: women's small gloves often pair with size 6, medium with 7, and large with 8. Men's medium gloves often align with size 9 or 9.5.
Canadian ring fit tips for every province
From humid summers in Ontario to dry prairie winters, Canadian climates shift finger size. Use these quick checks to keep your ring comfortable year-round.
Climate and activity considerations
Cold snaps shrink fingers while humid heat can add up to a half size. Try on rings when you're hydrated and not right after a workout.
Winter glove sizing vs ring sizing
Thick winter gloves can make a perfect-fit ring feel tighter. If you wear insulated gloves often, lean toward the larger half size.
Outdoor sports and swelling management
Skiing, hockey, and climbing can all cause temporary swelling. Many athletes switch to silicone rings one half size larger for training days.
Travel between provinces and humidity shifts
Moving between dry Alberta and coastal British Columbia can change finger size slightly. Recheck your fit after a few days in a new climate.
Canadian ring size FAQ
Are Canadian ring sizes the same as US ring sizes?
Yes. Canada uses the identical numeric scale with whole and half sizes, so a size 7 in Toronto equals a size 7 in New York.
What is the average ring size in Canada?
Most Canadian women fall between size 6 and 7 (16.5–17.3mm diameter), while men usually wear size 9 to 10 (18.9–19.8mm).
How do I convert a Canadian ring size to UK or EU sizes?
Use our international conversion chart to cross-reference your Canadian number to UK letters or EU scales. Canadian size 6 equals UK size L and roughly EU size 52.
Should I measure my ring size in winter or summer?
Measure when your hands are at a normal temperature—ideally late afternoon. If you size during winter and are between two options, consider the larger half size.