TL;DR — The quick answer

In Canada, ring size is measured by the inside circumference of the band in millimetres. The most common women's sizes run from 6 to 7 (about 51.9–54.4 mm) and men's from 9 to 11 (about 59.0–64.0 mm). The most reliable way to find your size at home is to measure an existing ring with a ruler, or come into our Montréal store for a free fitting on a steel mandrel — it takes 60 seconds and removes all the guessing.

Table of contents

1. How ring sizing actually works
2. Canadian / US ring size chart (mm circumference)
3. Four ways to measure your ring size at home
4. Comfort fit vs standard fit — and why it matters
5. When to size up: knuckles, weather, dominant hand
6. Quebec winter swelling: real numbers
7. Same-day and urgent ring sizing in Montréal
8. When a ring can't be resized
9. Sizing after purchase — what to do
10. FAQ

1. How ring sizing actually works

A ring size is just a number that maps to the inside circumference of the band, expressed in millimetres. North America uses a numerical scale (3 to 13.5 with half and quarter sizes); the UK uses letters; Europe uses the circumference in mm directly. We use the North American system at Bijouterie Jamil because Canada follows the US scale.

Each whole size up adds about 2.55 mm of circumference, which is roughly 0.81 mm of diameter. A half size is small but real — most people can feel the difference, especially in a wide band.

Two things change your size: the finger (knuckle vs base, dominant vs non-dominant hand) and the ring itself (width, comfort fit profile, weight). A 2 mm wedding band and an 8 mm men's band on the same finger can need different sizes. We'll come back to that.

2. Canadian / US ring size chart (mm circumference)

This is the chart we use on the bench. Print it, save it, screenshot it.

Most-common ranges in our Montréal store: women 5.5–7, men 9–11. If you fall outside that, you're not unusual — we cut and forge sizes 3 to 15 every month.

Need a printable PDF? Download our free Bijouterie Jamil ring sizer at bjamil.com/ring-sizer — it's a calibrated paper strip you wrap around your finger. Print it at 100% scale (no "fit to page") for accuracy.

3. Four ways to measure your ring size at home

None of these beat a steel mandrel at the store, but they get you within a half size if you do them carefully. Measure at the end of the day when your fingers are at their largest, and never when your hands are cold.

Method 1 — Existing ring (most accurate)

Find a ring you already wear comfortably on the same finger. Place it flat on a ruler and measure the inside diameter in millimetres, edge to edge. Match the number to the chart above.

• Pros: most reliable home method, accurate within ¼ size
• Cons: only works if you already own a well-fitting ring on that exact finger

Method 2 — String or floss

Wrap a piece of non-stretch string or dental floss around the base of your finger. Mark where it overlaps with a pen, lay it flat, and measure the length in mm. That's your circumference — match it to the chart.

• Pros: works with anything in a kitchen drawer
• Cons: string stretches; people pull too tight or too loose. Expect a half-size margin of error.

Method 3 — Printable paper strip

Download a printable ring sizer (ours, or any reputable jeweller's). Print at 100% scale, cut out the strip, slide the pointed end through the slot, and pull it snug around your finger. Read the number where it meets the slot.

• Pros: free, designed for the job
• Cons: you must print at exact scale. Verify with the included calibration ruler before you measure.

Method 4 — Professional fitting (free at our store)

Come in. We slide a set of calibrated steel sizers onto your finger one at a time until we find the size that goes on with a slight resistance and comes off over the knuckle with a gentle pull. It takes 60 seconds, costs nothing, and is the only method I trust for an engagement ring or any custom build.

If you're surprising someone, bring one of their existing rings and we'll measure it on a steel mandrel — discreet, no questions asked.

4. Comfort fit vs standard fit — and why it matters

This is the part most people don't know about, and it matters more than the size itself for wide bands.

• Standard fit: the inside of the band is flat. The full width of the ring touches your finger.
• Comfort fit: the inside of the band is slightly domed. Less of the metal touches your finger, so it slides over the knuckle more easily.

A comfort fit ring usually wears a half size smaller than a standard fit of the same nominal size. So if you're a 7 in your everyday standard band and you order an 8 mm comfort-fit wedding ring, order it at 6.5.

Rule of thumb: any band 6 mm wide or wider, choose comfort fit. Any band 4 mm or narrower, standard fit is fine. In between, it's a preference call — a wider band naturally feels tighter because more metal is pressing on more skin.

5. When to size up: knuckles, weather, dominant hand

A ring needs to clear the knuckle on the way on and stay put on the base of the finger. These two demands fight each other if your knuckle is larger than your finger base — and most of us have that to some degree.

Size up by ¼ to ½ a size if: - Your knuckle is noticeably bigger than the base of your finger - The ring is going on your dominant hand (it's slightly larger from daily use) - The band is wide (6 mm or more) and not comfort fit - You're sizing in the morning (fingers are smaller after sleep) - You measured when your hands were cold

Don't size up if: - The ring is for an active or athletic finger that swells with grip work - It's a thin band (under 3 mm) — too loose and it'll spin - It's a solitaire engagement ring with a heavy stone — a loose ring tilts and the stone ends up sideways

If you're truly between sizes and the band is medium-width, go with the larger size. We can always size down by a quarter for $50–$90 CAD; a too-tight ring is a rescue job.

6. Quebec winter swelling: real numbers

Living in Montréal means your fingers are a different size in February than in July. We see this every week at the bench.

Cold weather (below 0°C): blood vessels constrict, fingers shrink. A ring that fits perfectly in summer can spin or even fall off when you're walking down rue Sainte-Catherine in January. Expect roughly ¼ to ½ size smaller in deep winter.

Hot, humid weather (July–August): fingers swell. The same ring can feel tight to the point of leaving an indentation. Expect roughly ¼ size larger in peak summer.

Salt, alcohol, exercise, pregnancy, hormonal cycles, long-haul flights — all of these push fingers up by a quarter size temporarily. None of them are reasons to permanently resize a ring. Just take it off if it's uncomfortable that day.

Our advice for Québec buyers: size your ring to fit comfortably in spring or fall (April or October). That's your true average. A winter measurement will be too small; a August measurement will be too big.

7. Same-day and urgent ring sizing in Montréal

Wedding tomorrow? Engagement tonight? Don't panic — call us first.

We offer urgent same-day ring sizing at our Montréal store for most plain bands and many setting types. Drop off in the morning, pick up by closing. Pricing typically runs $60–$150 CAD depending on metal, size change, and how complex the setting is. Add a rush fee of $40–$80 for same-day turnaround.

What we can usually do same-day: - Plain gold or platinum bands, up to ±1 full size - Simple solitaire engagement rings with a single centre stone in prongs - Most signet rings and class rings - Adding sizing beads or a sizing bar (a less invasive resize that we can do in 30–60 minutes)

What needs 2–5 business days: - Channel-set or pavé eternity styles (when sizing is even possible — see next section) - Heavily engraved bands where the engraving must be re-cut - Tension settings - Anything with stones near the bottom of the shank that need to be removed and reset

If you've just bought a ring and it doesn't fit, contact us right away — within the first few weeks, our standard sizing service is the same as for a ring we made ourselves. Bring the receipt or the original packaging if you have it.

8. When a ring can't be resized

This is the conversation I have at least three times a week. Some rings physically cannot be resized, or the resizing would destroy them. Know this before you buy.

Cannot be resized (or shouldn't be): - Full eternity bands — stones go all the way around the shank. There's no plain metal to cut and stretch. The only option is to remake the ring at the new size, often at full or near-full cost. - Tension-set rings — the stone is held in place by the spring tension of the band itself. Cutting the band releases that tension and the stone falls out. Some can be remade; most cannot. - Inlaid rings (wood, meteorite, ceramic, carbon fibre, opal inlay) — the inlay can't survive the heat or the stretching. Remake only. - Titanium and tungsten rings — too hard to cut and re-weld with normal jewellery tools. We don't resize them; we replace them. - Certain heat-sensitive stones near the shank — emerald, opal, tanzanite, and pearls can crack from the torch heat used during a traditional resize. With laser welding, we can sometimes work around this — ask us.

Can usually be resized (with limits): - Plain gold bands (10K, 14K, 18K): up to ±2 full sizes is routine - Platinum bands: up to ±1.5 sizes; harder metal, longer bench time - Solitaire prong settings: up to ±1 size without disturbing the stone - Half-eternity bands (stones across the top half only): up to ±½ size

Always ask before you buy, especially for an eternity band or tension setting. We tell every Bijouterie Jamil customer this upfront because nothing breaks a couple's heart faster than learning their wedding band can't be made to fit.

9. Sizing after purchase — what to do

You bought a ring, it doesn't fit, it's panicking you. Here's the order of operations:

1. Don't wear it more than you need to. A too-tight ring on a swollen knuckle becomes a 911 call. A too-loose ring goes down a drain.
2. Confirm the current marked size. Look inside the band — most rings are stamped with the size next to the metal stamp (14K, 18K, PT950).
3. Re-measure your finger at the end of the day, in moderate weather, using one of the four methods above.
4. Contact the seller first — many jewellers, including us, offer a first sizing free or at cost within 30 days of purchase.
5. Bring it in. We'll size it on a mandrel, confirm what you actually need, and quote the resize before we touch a tool.

If you bought from another store and they won't help, we resize rings made anywhere — we just need to inspect the metal, the stones, and the construction first. Most resizes from other shops are completed in 3–5 business days for $60–$180 CAD.

FAQ

How do I find my ring size at home without a sizing tool? The most accurate home method is to measure an existing ring you already wear comfortably. Lay it flat, measure the inside diameter in millimetres with a ruler, and match it to a Canadian/US ring size chart. A size 6 is 16.5 mm; a size 7 is 17.3 mm; each whole size adds about 0.8 mm of diameter.

What is the average ring size in Canada? Across our Montréal customers, women average a size 6 to 7 and men a size 9 to 11. Anything from a size 3 to a size 15 is normal — we forge custom shanks across that whole range every month.

Does ring width change the size I need? Yes. A wider band feels tighter because more metal contacts your skin. For any band 6 mm or wider, choose a comfort-fit profile and order a half size smaller than your standard-fit size.

Can my engagement ring be resized after I buy it? A traditional solitaire with a single prong-set stone can usually be resized up or down by one full size with no risk. Eternity bands, tension settings, and rings with stones set into the shank often cannot be resized at all and must be remade. Always ask before purchase.

Do you offer urgent or same-day ring resizing in Montréal? Yes. For plain bands and most simple settings we offer same-day sizing if you drop off by mid-morning. Pricing is typically $60–$150 CAD plus a $40–$80 rush fee. Call ahead so we can hold a bench slot.

How much does it cost to resize a ring in Montréal? A standard resize on a 14K or 18K gold band runs $60–$120 CAD. Platinum is $90–$180. Sizing with stones, engraving, or laser welding can run $150–$300. We always quote before we start.

Why does my ring fit in summer but not in winter? Cold weather constricts blood vessels and shrinks your fingers by roughly a quarter to a half size. Heat and humidity expand them by about a quarter size. We recommend sizing your ring in spring or fall to land on your true average.

Should I size up if my knuckle is bigger than my finger base? Yes — by a quarter to a half size, so the ring clears the knuckle on the way on. If the ring then spins too freely on the finger base, we can add tiny sizing beads inside the band: a 30-minute, reversible fix that costs $40–$80 CAD.

Come in for a free fitting

The fastest, most accurate way to find your ring size is to walk into our Montréal store on rue Saint-Hubert and put your finger on a steel mandrel. It takes a minute, it's free, and there's no obligation. We'll also size any ring you already own at no charge.

If you're shopping for an engagement ring and want to be discreet, bring one of her existing rings — we'll measure it without a word and keep it on file for when you're ready.

Book a private consultation at bjamil.com or visit us in person. Related reading: our custom engagement ring process, jewellery repair services, and laser welding and soldering guide all touch on the bench-side of this work.

Nader Khazzoum is the master jeweller and co-owner at Bijouterie Jamil, the family-run Montréal jewellery house his family has operated for over 60 years. He specializes in custom fabrication, stone setting, and laser welding, and he sizes between 30 and 60 rings every week at the bench.