Canada Bra Size Calculator & Converter
Calculate your Canadian bra size in inches or centimetres, convert instantly to UK, EU, AU & FR — with sister sizes and Knix, La Vie en Rose, Aerie Canada & ThirdLove fit notes.
How to measure correctly
- Wear a non-padded bra or no bra for accurate readings.
- Underbust: wrap tape snugly around your ribcage directly under the bust. Keep tape parallel to the floor. Exhale fully and measure in inches or cm.
- Overbust: measure around the fullest part of your bust. Tape should be loose enough to slide a finger underneath.
- Stand naturally — don’t lift arms or lean forward. Both measurements in the same posture.
- Round to the nearest ½ inch (or 0.5 cm) for best accuracy.
International Size Conversions
Your Sister Sizes (Same Cup Volume)
Recommended Bras for Canadian Shoppers
Top-rated bras available on Amazon — ships to Canada and uses CA/US sizing.
- CA/US bands 30–46, cups A–DDD
- Wire-free comfort for all-day wear
- Knix, Wacoal, ThirdLove styles
- CA/US bands 32–46, cups DD–G
- Three-section cup, side support
- Elomi, Goddess, Wacoal styles
Measure in inches or centimetres to get your accurate Canadian bra size
What Is the Canadian Bra Sizing System?
Canadian bra sizing is identical to the US sizing system: inch-based band numbers (28, 30, 32, 34, 36, 38…) paired with doubled-letter cup sizes (A, B, C, D, DD, DDD, DDDD). Band size is calculated from your underbust measurement in inches, rounded to the nearest even number. Cup size is the difference between overbust and underbust in inches — each inch equals one cup step. Canadian brands including Knix, La Vie en Rose, and Aerie Canada all follow US-style sizing. If you know your US size, your Canadian size is identical — no conversion needed.
Canada’s lingerie market is deeply integrated with the US market, meaning Canadian consumers shop extensively from American brands like Victoria’s Secret, ThirdLove, and Aerie that ship across the border. Because both countries use the same sizing system, a Canadian 34C purchased from Knix is exactly the same as a US 34C purchased from ThirdLove — the same band measurement, the same cup volume, the same label.
Where Canadian sizing creates complexity is at the interface with UK and European brands. An increasing number of Canadians shop from international platforms like ASOS (UK), Zalando (EU), and Bravissimo (UK), where the cup letters diverge above D cup. A Canadian or American shopper wearing 34DDD will need to look for UK 34E or EU 75F when shopping from European retailers. Without understanding this conversion, most shoppers either order incorrectly or avoid D+ cups from international sources entirely.
Canada also has a strong French-speaking market in Quebec, where shoppers sometimes encounter French-labelled bras from brands like Chantelle or Simone Pérèle sold through department stores. These brands use French sizing (EU + 15), meaning a Chantelle FR 90B sold in a Montreal department store has the same underbust as an American 34B — not a 90-inch or 90-centimetre underbust.
Canadian bands are inch-based — identical to US bands, rounded to the nearest even number.
Canadian cup letters match US — doubled letters (DD, DDD, DDDD) above D cup.
- Canadian bra sizing is identical to US sizing — same band numbers, same cup letters, zero conversion needed
- CA/US 34C = UK 34C = AU 12C — cup letters through D are the same across all three systems
- CA/US DDD = UK E = EU F — the most important conversion when buying from European brands
- Canadian brands Knix, La Vie en Rose, Aerie Canada all follow US-style sizing
- French-labelled bras sold in Canada (Chantelle, Simone Pérèle) use FR bands — subtract 15 to get EU equivalent
How to Measure Your Canadian Bra Size
You need two measurements: your underbust (ribcage below the bust) and your overbust (fullest part of the bust). Both in inches. A soft tape measure is all you need.
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Prepare correctly
Wear a non-padded bra or no bra. Padded bras add 1–2 inches to your overbust reading, shifting your cup calculation. Stand naturally with arms relaxed at your sides.
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Measure your underbust in inches
Wrap the tape snugly around your ribcage directly beneath your bust. Keep it parallel to the floor all the way around. Exhale fully and read to the nearest half inch. Round to the nearest even number — this gives your Canadian band size: 29.5 in rounds to 30, 31 in rounds to 32, 33 in rounds to 34.
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Measure your overbust in inches
Measure around the fullest point of your bust. Keep the tape horizontal and loose enough to slide one finger underneath. Record to the nearest half inch.
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Calculate your Canadian band
Round your underbust to the nearest even number: 27–28 in = 28, 29–30 in = 30, 31–32 in = 32, 33–34 in = 34, 35–36 in = 36, 37–38 in = 38, 39–40 in = 40. If your measurement is odd (e.g., 31 in), try both 30 and 32.
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Calculate your cup letter
Subtract underbust from overbust in inches: 1 in = A, 2 in = B, 3 in = C, 4 in = D, 5 in = DD, 6 in = DDD, 7 in = DDDD/G, 8 in = H. Each inch of difference equals one cup step — identical to the US system.
Remeasure every six months, or after any weight change of 5 lb (2.5 kg) or more, pregnancy, or breastfeeding. Knix’s online fitting service and La Vie en Rose’s in-store fitting teams both report that the majority of Canadian women wearing the wrong size are in a band 2–4 sizes too large with a cup 1–2 sizes too small. A two-minute home measurement prevents this entirely.
Skip the calculation — use the calculator
Enter your measurements once and get your exact Canadian size plus conversions to UK, EU, AU, FR instantly.
Open the Canada Bra Size Calculator →Canadian Bra Size Chart (Underbust Inch Reference)
This chart is the sizing reference used by Knix, La Vie en Rose, Aerie Canada, Walmart Canada, and all US brands shipping to Canada. Canadian band sizes are identical to US band sizes.
Canadian sizes compared with US, UK, AU, and EU systems
| CA / US Band | Underbust (in) | Underbust (cm) | UK Band | AU Band | EU Band | FR Band |
|---|---|---|---|---|---|---|
| 28 | 25–27 | 63–67 | 28 | AU 6 | 65 | 80 |
| 30 | 27–29 | 68–72 | 30 | AU 8 | 70 | 85 |
| 32 | 29–31 | 73–77 | 32 | AU 10 | 75 | 90 |
| 34 | 31–33 | 78–82 | 34 | AU 12 | 80 | 95 |
| 36 | 33–35 | 83–87 | 36 | AU 14 | 85 | 100 |
| 38 | 35–37 | 88–92 | 38 | AU 16 | 90 | 105 |
| 40 | 37–39 | 93–97 | 40 | AU 18 | 95 | 110 |
| 42 | 39–41 | 98–102 | 42 | AU 20 | 100 | 115 |
| 44 | 41–43 | 103–107 | 44 | AU 22 | 105 | 120 |
| 46 | 43–45 | 108–112 | 46 | AU 24 | 110 | 125 |
Canadian Cup to UK, EU, AU Cup Conversion
Canadian cup letters are identical to US cup letters. The conversion issues arise when Canadian shoppers buy from UK or EU retailers, where cup letters diverge above D cup. The table below maps every CA/US cup to its international equivalents.
| CA / US Cup | UK / AU / IN Cup | EU Cup | JP / KR Cup | Difference (inches) |
|---|---|---|---|---|
| AA | AA | AA | AA | ~0.5 in |
| A | A | A | A | 1 in |
| B | B | B | B | 2 in |
| C | C | C | C | 3 in |
| D | D | D | D | 4 in |
| DD | DD | E | E | 5 in |
| DDD | E | F | F | 6 in |
| DDDD / G | F | G | G | 7 in |
| G / H | FF | H | H | 8 in |
| H / I | G | I | — | 9 in |
| I / J | GG | J | — | 10 in |
Many Canadian shoppers believe that D cup or DD cup is a large size. In the global context, CA/US DD is the fifth cup letter — equivalent to UK DD, EU E — a mid-range size stocked by every major UK, EU, and Australian specialist. CA/US DDD, which many Canadian shoppers avoid as it sounds extreme, is simply UK E or EU F — a very common size at Bravissimo and Hunkemöller. The doubled-letter notation makes sizes sound larger than they are.
What Are Sister Sizes in Canadian Bras?
Sister sizes are bra sizes with identical cup volume but different band widths. They are your most useful shopping tool when your exact size is out of stock — especially at La Vie en Rose, where popular sizes like 34C and 36B sell out quickly.
The sister size rule
- Smaller band, larger cup letter: If your 34C band rides up, try 32D. Same volume, tighter band.
- Larger band, smaller cup letter: If your 34C band digs in, try 36B. Same volume, looser band.
| Size | Band Feel | Cup Volume | When to Try It |
|---|---|---|---|
| CA 32D | Tighter | Same | Your 34C band rides up or feels loose |
| CA 34C | Standard | Same | Your primary size |
| CA 36B | Looser | Same | Your 34C band digs in or feels tight |
Different fits across major Canadian and cross-border US bra brands
Canadian Bra Brand Sizing Differences
Canadian and US brands both use the same sizing system, but construction varies meaningfully between labels — and between domestic Canadian brands and US imports.
Knix CA
Canadian-founded brand known for leak-proof and wireless styles. Knix uses US-style sizing across bands 30–46 and cups A–G. Their sizing is generally true to the CA/US standard, with bands running slightly firm in their structured styles and true in wireless options.
Fit: True to CA/US size in wireless styles. Structured bras run firm in the band — size up one band if between sizes. Knix’s online size quiz provides strong personalized guidance.
La Vie en Rose CA
Quebec-founded Canadian lingerie retailer with stores nationwide. Uses US-style sizing. La Vie en Rose stocks bands 30–44 and cups A–DDD. Their bands tend to run true and cups tend to run slightly shallow, particularly in moulded-cup styles.
Fit: True to CA band. Cups run slightly shallow in moulded styles — size up one cup if you’re between sizes or have a fuller shape. Wire styles are more consistent.
Aerie Canada (American Eagle)
US-brand with a strong Canadian retail and online presence. Uses identical US/CA sizing. Known for soft-cup and wireless styles. Aerie bands run loose compared to the US standard — particularly in their bralette range.
Fit: Bands run loose — size down one band from your measured size. Cups are true to CA/US standard. Bralettes follow XS–XXL sizing separate from the band/cup system.
ThirdLove US → CA
Ships to Canada from the US. Uses US sizing with half-cup sizes (e.g., 34C½). ThirdLove bands run true to the US standard. Half-cup sizes help Canadian shoppers who fall between standard letters. Ships duty-free over CAD $150 threshold.
Fit: True to CA/US band. If your cup gapes slightly, try the half-size down. If it overflows slightly, try the half-size up. No conversion needed — identical to your CA size.
Victoria’s Secret US → CA
Ships to Canada and has Canadian stores. Uses US sizing — identical to CA sizing. VS bands run small and cups run generous relative to the label. Stock extends to DDD in most styles, with G cup in selected lines.
Fit: Bands run small — size up one band if your measurement is borderline. Cups run generous — your true CA size may be one cup smaller than VS recommends.
Walmart Canada
Wide range of budget bras in CA/US sizing across bands 32–48 and cups A–DDD. Private-label and branded options. Sizing varies by brand but generally follows the CA/US standard. Limited D+ cup range above DDD.
Fit: Varies by brand. Own-label sizes run approximately true. For D+ cups above DDD, Walmart Canada has limited options — consider Knix, Amazon CA, or cross-border US brands.
Bravissimo UK (buying from Canada)
UK specialist for D+ cups. Ships internationally including Canada. Uses UK cup letters — one behind CA/US above DD. CA 34DDD → UK 34E. CA 34DDDD → UK 34F. Band numbers are identical: CA 34 = UK 34.
Fit tip: Keep your CA band number. Convert the cup: CA DDD → UK E, CA DDDD → UK F. Bravissimo’s range starts where most Canadian retailers stop — excellent for DDD+ shoppers.
Chantelle FR (sold in Canada)
Sold in Canadian department stores using French sizing. FR band = EU band + 15. FR 90B sold in Montreal equals a CA/US 34B — not a 90-inch or 90-cm band. Cup letters are identical to EU and run one ahead of CA/US above D.
Fit tip: Subtract 15 from the FR band to get EU band, then convert: FR 90 → EU 75 → CA 34. Cup: FR B = CA B (through D). Above D: FR E = CA DD, FR F = CA DDD.
Signs Your Canadian Bra Size Is Wrong
Band size problems
- Band rides up at the back: band too big. Try one band down, one cup up (e.g., CA 36B → 34C).
- Band leaves deep red marks or digs in: band too small. Try one band up, one cup down (e.g., CA 34C → 36B).
- Band pulls forward when arms are raised: band too loose. Tighten hooks or go down one band.
Cup size problems
- Spillover at top or sides: cup too small. Size up one letter (CA 34C → 34D).
- Gaping or wrinkling fabric: cup too big. Size down one letter (CA 34C → 34B).
- Underwire sitting on breast tissue: cup too small. Size up one letter immediately.
- Centre gore not lying flat: cup too small or wire width wrong for your breast spacing.
Canadian bra fit research mirrors US findings — approximately 80% of women are wearing an incorrectly sized bra, most in a band that is too large and a cup that is too small. This is partly a legacy of the outdated “add 4 inches” formula historically used in North American bra fitting. If you have not measured using the direct underbust method in the last 12 months, your current size is likely incorrect.
Why Canadian Bra Sizing Confuses Shoppers
The cross-border shopping problem
Canada’s geographic and cultural proximity to the US — and its proximity in French Quebec to European fashion — means Canadian consumers regularly encounter three different sizing systems in a single shopping trip. Buying Knix online (CA/US sizing), browsing La Vie en Rose in-store (CA/US sizing), then adding a Chantelle bra at Hudson’s Bay (French sizing) leaves many shoppers with three different size labels for the same body.
The French-label issue in Quebec
Quebec’s French-speaking market creates a specific sizing confusion: European and French brands sold through Quebec department stores and boutiques use French sizing (EU + 15 on the band number). A shopper who sees FR 90C at Simons assumes this means a 90 cm or 90-inch underbust — it means neither. FR 90 corresponds to an EU 75 band and a CA/US 34 band. Subtracting 15 from any French band number gives the EU equivalent, which then converts to CA/US using the standard band chart.
The UK-brand cup letter shift
As Canadian consumers increasingly shop from Bravissimo, ASOS, Marks & Spencer, and other UK retailers shipping to Canada, the cup letter shift above DD becomes the primary conversion error. A Canadian 34DDD shopper is a UK 34E — not a 34DDD. Most UK retailers do not carry CA/US cup notation at all, so Canadian D+ cup shoppers must know their UK equivalent to shop effectively from British brands.
Our approach treats Canadian sizing as fully equivalent to US sizing — the same band rounding (underbust in inches to nearest even number), the same cup calculation (1 inch per cup step), and the same doubled-letter notation. We then apply CA/US-to-UK cup conversion, EU band calculation from cm, and the French +15 offset to produce accurate international conversions for the three sizing systems most commonly encountered by Canadian shoppers.
Shopping International Brands as a Canadian Shopper
Buying from US retailers
No conversion needed. CA and US sizing are identical. CA 34C = US 34C. Your Canadian size is your US size. Canadian shoppers buying from Victoria’s Secret, ThirdLove, Aerie, or Wacoal online use their exact Canadian size with no adjustment. The only practical consideration is import duties on orders below the CAD $150 de minimis threshold — most major US retailers now handle this at checkout for Canadian addresses.
Buying from UK retailers
Keep your CA band number. Convert your cup: CA A–D = UK A–D (identical). Above D: CA DD = UK DD, CA DDD = UK E, CA DDDD = UK F, CA G = UK FF, CA H = UK G. So CA 34DDD = UK 34E at Bravissimo, ASOS, or Marks & Spencer. Band numbers stay the same across CA and UK.
Buying from EU retailers
Convert your CA band using underbust cm: CA 34 (78–82 cm underbust) = EU 80. CA 36 = EU 85. Convert your cup: CA DD = EU E, CA DDD = EU F, CA DDDD = EU G. So CA 34DDD = EU 80F at Triumph or Hunkemöller. French brands (Chantelle, Zalando FR) add 15 to EU band: CA 34 = EU 80 = FR 95.
Buying from Australian retailers
CA band converts to AU via cm: CA 34 (78–82 cm) = AU 12. CA 36 = AU 14. Cup letters are identical to UK letters and match CA through DD: CA DD = AU DD, CA DDD = AU E, CA DDDD = AU F. So CA 34DDD = AU 12E at Berlei or Bonds.
When buying from ASOS Canada (which lists both US and UK brands), check the brand’s country of origin before ordering. US-brand listings use CA/US sizing. UK-brand listings use UK sizing. ASOS’s own-label follows UK sizing. The size system is determined by the brand, not by ASOS’s Canadian platform — so filtering by “34C” will return some 34C in US notation and some 34C in UK notation, which are the same size through D cup but diverge above it.
Recommended Bras for Canadian Shoppers
As an Amazon Associate, Bra-Calculator.com earns from qualifying purchases at no extra cost to you.
- CA/US bands 30–46, cups A–DDD
- Wire-free all-day comfort
- Knix, Wacoal, Warners styles
- Smooth finish under any fabric
- CA/US bands 30–42, cups A–DDD
- Maidenform, Wacoal, Natori
- CA/US bands 32–46, cups DD–G
- Underwire, three-section cup
- Elomi, Goddess, Wacoal Plus
- Encapsulation for D+ cups
- CA/US bands 30–44
- Moving Comfort, Panache Sport
Frequently Asked Questions
Canadian bra sizing is identical to the US system: inch-based band numbers (28, 30, 32, 34, 36, 38…) and doubled-letter cup sizes (A, B, C, D, DD, DDD, DDDD). Band size is your underbust in inches rounded to the nearest even number. Cup size is the difference between overbust and underbust in inches: 1 in = A, 2 in = B, 3 in = C, 4 in = D, 5 in = DD, 6 in = DDD. Canadian brands including Knix, La Vie en Rose, Aerie Canada, and Walmart Canada all follow this system.
Yes — they are completely identical. Canadian and US bra sizing use the same band numbers, the same cup letters, and the same measurement logic. A Canadian 34C is exactly the same as a US 34C. When shopping from American brands like Victoria’s Secret, ThirdLove, Aerie, or Wacoal, Canadian shoppers use their exact Canadian size with no adjustment needed. The same applies in reverse — Americans shopping from Knix or La Vie en Rose use their US size directly.
CA and UK band numbers are identical — CA 34 equals UK 34. Cup letters match through D: CA A = UK A, CA D = UK D. Above D the systems diverge: CA DD = UK DD, CA DDD = UK E, CA DDDD = UK F, CA G = UK FF, CA H = UK G. Keep your band number and convert only the cup letter. A Canadian shopper wearing CA 34DDD would look for UK 34E at Bravissimo, ASOS, or Marks and Spencer.
Canadian DDD equals UK E and EU F. All three describe the same cup volume — approximately 6 inches (15 cm) of bust-to-underbust difference. On a 34-inch band: CA 34DDD = UK 34E = EU 75F = FR 90F = AU 12E. The physical cup volume is identical regardless of label. CA DDD sounds extreme but it is a mid-range size stocked by every major UK and European specialist retailer.
Both use CA/US sizing but differ in construction. La Vie en Rose cups in moulded styles tend to run slightly shallow — many shoppers with a fuller shape find they need one cup size up compared to Knix. Knix’s wireless bands tend to be firmer than La Vie en Rose’s soft-cup constructions. The most reliable Canadian reference brand for true-to-size fit is Knix’s structured styles — use these as a benchmark when testing other Canadian or US brands.
Sister sizes are CA bra sizes with the same cup volume but different band widths. From CA 34C, the sister sizes are CA 32D (tighter band, same volume) and CA 36B (looser band, same volume). To find your CA sister sizes, go up one band and down one cup letter, or down one band and up one cup. Sister sizes are particularly useful at La Vie en Rose and Aerie Canada where popular sizes like 34C and 36B sell out during sales.
Published data from Canadian retailers suggests 34B and 34C are the most commonly sold sizes, mirroring US patterns. However, Knix’s customer fitting data indicates the true average Canadian size when accurately measured is closer to 34DD or 36C — larger than the most commonly purchased size. The discrepancy reflects the historical prevalence of the inaccurate add-4 formula, which pushed millions of Canadian women into larger bands and smaller cups than their measurements indicate.
Measure your underbust in inches snugly under your bust and round to the nearest even number — this is your CA band. Measure your overbust loosely at the fullest point. Subtract underbust from overbust in inches: 1 in = A, 2 in = B, 3 in = C, 4 in = D, 5 in = DD, 6 in = DDD. Home measuring is accurate within one sister size for approximately 85% of women when done without a padded bra. Our Canada calculator accepts both inches and centimetres.
Every six months at minimum, or after any weight change of 5 lb (2.5 kg) or more, pregnancy, breastfeeding, or starting or stopping hormonal contraception. Knix’s fitting team recommends remeasuring annually as a minimum. Most Canadian women who have not measured in over a year will find their size has shifted by at least one band or cup step — particularly following the weight fluctuations that are common across Canadian seasonal lifestyle changes.
If your underbust rounds to an odd number — for example, 33 inches falls between CA 32 and CA 34 — try the smaller band first. Canadian bra bands stretch with wear, particularly the elastane blends used by Knix and La Vie en Rose. A band that feels snug when new will relax to a comfortable fit within a week. If it still feels genuinely restrictive when breathing deeply after several days of wear, size up to the next even-number band.
Canadian bra band sizes are labelled in inch-based numbers (30, 32, 34, 36) derived from underbust measurement in inches. Most Canadian bra fitting guides from Knix, La Vie en Rose, and Victoria’s Secret Canada use inches for measurement instructions. Our Canada calculator accepts both inches and centimetres — if you measure in cm, the calculator converts internally to produce your CA band and cup using the same inch-equivalent logic.
Most Canadian retailers stock bands 30–44 and cups A through DDD. Knix extends to G cup in selected styles. For sizes above DDD — which corresponds to UK E and EU F — Canadian shoppers are best served by UK specialist retailers like Bravissimo or Figleaves that ship internationally to Canada, or by US extended-range retailers like Bare Necessities and HerRoom that ship cross-border. These retailers stock through K or L cup equivalent in UK terms.
French brands sold in Canada (Chantelle, Simone Pérèle, Aubade) use French sizing on their labels — which adds 15 to the EU band number. A Chantelle FR 90B sold at Hudson’s Bay corresponds to a CA/US 34B — not a 90-inch underbust. To convert: subtract 15 from the FR band to get the EU band (FR 90 = EU 75), then use the band conversion table to find your CA equivalent (EU 75 = CA 34). The cup letters in French sizing are EU cup letters — above D, FR E = CA DD, FR F = CA DDD.
Related Calculators & Guides
- US Bra Size Calculator
- UK Bra Size Calculator
- Australian Bra Size Calculator
- EU Bra Size Calculator
- India Bra Size Calculator
- Japan Bra Size Calculator
- France Bra Size Calculator
- All Country Calculators
- Global Bra Size Converter
- Free Bra Size Calculator
- Sister Size Calculator
- Cup Size Calculator
- Complete Bra Size Chart
- How to Measure Bra Size
- Common Bra Fit Problems
- Breast Shape Identifier
- AI Smart Fit Bra Calculator
- Cup Size Visual Guide
- Bra Fit Problem Solver
- How to Know If Your Bra Fits
- 34B Bra Size Guide
- 36C Bra Size Guide
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