Ring Size Chart for Canadian Buyers: How to Measure Your Ring Size at Home

Getting the ring size right matters more than most buyers realize until they get it wrong. Too small and the ring won't go past the knuckle. Too large and it spins. This guide gives you the complete Canadian ring size chart, three reliable ways to measure at home, the most common mistakes buyers make, and what to do if you're ordering for a partner whose size you don't know.

Canadian Ring Size Chart (US/Canada Sizing)

Canada uses the same ring size system as the United States — sizes run in half-integer increments (3, 3.5, 4, 4.5, etc.). Each size corresponds to a specific internal ring diameter and circumference. The circumference is the measurement you'll use if measuring with string or paper at home.

Ring Size (US/CA)	Internal Diameter (mm)	Circumference (mm)
3	14.1 mm	44.2 mm
3.5	14.5 mm	45.5 mm
4	14.9 mm	46.8 mm
4.5	15.3 mm	48.0 mm
5	15.7 mm	49.3 mm
5.5	16.1 mm	50.6 mm
6 (most common women’s size)	16.5 mm	51.9 mm
6.5	16.9 mm	53.1 mm
7	17.3 mm	54.4 mm
7.5	17.7 mm	55.7 mm
8	18.2 mm	57.2 mm
8.5	18.6 mm	58.3 mm
9	19.0 mm	59.7 mm
9.5	19.4 mm	61.0 mm
10	19.8 mm	62.2 mm

Most common ring sizes: The average women’s ring size in Canada is between 6 and 7, with size 6 being the single most common. If you’re ordering a surprise ring and have no size information at all, size 6 is the safest starting guess — but only a guess.

Method 1: String or Paper Strip (Most Accurate at Home)

This is the most reliable home measurement method and takes about two minutes.

1. Cut a thin strip of paper (about 6mm wide) or use a piece of string.
2. Wrap it snugly around the base of the finger you’re sizing — usually the ring finger on the left hand. Snug means it lies flat against the skin without cutting in.
3. Mark where the paper overlaps itself, or where the string meets.
4. Lay the paper or string flat and measure the length in millimetres from the end to your mark. This is your finger’s circumference.
5. Find your circumference in the chart above to identify your ring size.

Important: If your measurement falls between two sizes, round up to the larger size. A ring that’s slightly loose is easier to adjust than one that won’t clear the knuckle.

Method 2: Measure an Existing Ring

If you have a ring that fits the correct finger well, measure its internal diameter with a ruler or calipers and match it to the diameter column in the chart above. This is the fastest method and highly accurate if the existing ring fits properly.

When measuring: place the ring flat on a surface and measure straight across the inside of the band, not the outside.

Method 3: Ring Sizer Tool

Many jewelers — including Toronto Fine Jewelry — can provide or ship a ring sizer on request. This is a set of sample rings in each size that you try on to find your exact fit. It’s the most accurate method and eliminates all guesswork. Contact us at torontofine@gmail.com to arrange one if you’re preparing a surprise proposal and want certainty before ordering.

Common Measurement Mistakes to Avoid

• Measuring when fingers are cold. Fingers shrink in cold weather — sometimes by half a size or more. Measure at room temperature or when your hands are warm for the most accurate result.
• Measuring too tightly. The string or paper should sit comfortably on the finger, not compress the skin. Too tight a measurement produces a size that won’t go over the knuckle.
• Ignoring the knuckle. If your knuckle is noticeably larger than the base of your finger, measure both and choose a size between the two. A ring needs to clear the knuckle but shouldn’t spin on the base of the finger.
• Measuring the wrong finger. Ring sizes differ between fingers on the same hand, and between left and right hands. Measure the specific finger on the specific hand where the ring will be worn.
• Measuring only once. Take the measurement two or three times and compare results. If they’re consistent, you have your size. If they vary, try again with fresh paper or string.

Ordering a Surprise Engagement Ring Without Her Size

If you’re proposing and can’t measure directly, these approaches help:

• Borrow a ring she wears on her ring finger and measure its internal diameter
• Ask a close friend or family member who might know
• Look at rings she’s tried on or saved online — some may have a noted size
• If none of the above work, order a size 6 (the most common) and plan for a possible exchange

Toronto Fine Jewelry’s 30-day exchange policy covers unworn rings in original packaging. If the size isn’t right after the proposal, exchanging for the correct size is straightforward.

How Toronto Fine Jewelry Handles Sizing

Every ring in the TFJ engagement ring collection is made to order in your specified size — the full range from size 3 to 10 (in half increments) is available on every design. There’s no additional charge for non-standard sizes, and production to your exact measurement is standard, not an upgrade.

If you’re unsure about sizing or want to confirm before placing an order, reach out at torontofine@gmail.com or visit our Vaughan studio by appointment at 7777 Weston Road. Getting the size right from the start means a ring that’s ready to wear the moment it arrives.