Women's Bra Size Chart: A Simple Guide to Finding Your Perfect Fit (2026)
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| Women's bra size chart converting US UK and EU sizes with cup measurement guide |
Women's Bra Size Chart: A Simple Guide to Finding Your Perfect Fit (2026)
Understanding bra sizes can feel confusing due to differing regional measurement standards (US, UK, EU) and brand-specific sizing systems. However, finding your exact bra fit is straightforward once you understand how band size and cup volume work together.
This ultimate guide provides an international bra size conversion chart, step-by-step home measurement rules, a breakdown of sister sizes, and essential online shopping tips for 2026.
International Bra Size Conversion Matrix (US, UK, EU)
Bra sizing standards differ internationally. Use this comprehensive conversion table to match your band and cup sizes across US, UK, and European standards.
| Band (Inches) | EU Band (cm) | US Cup Size | UK Cup Size | EU Cup Size | Recommended Bra Style |
| 30 Inches | 65 cm | A / B / C / D | A / B / C / D | A / B / C / D | Petite Contour / Bralette |
| 32 Inches | 70 cm | B / C / D / DD | B / C / D / DD | B / C / D / E | Everyday T-Shirt / Wireless |
| 34 Inches | 75 cm | C / D / DD / DDD | C / D / DD / E | C / D / E / F | Balconette / Plunge Bra |
| 36 Inches | 80 cm | D / DD / DDD / G | D / DD / E / F | D / E / F / G | Full Coverage / Side Support |
| 38 Inches | 85 cm | DD / DDD / G / H | DD / E / F / FF | E / F / G / H | High-Support / Wide Strap |
| 40 Inches | 90 cm | DDD / G / H / I | E / F / FF / G | F / G / H / I | Plus Size Side Support Minimizer |
| 42 Inches | 95 cm | G / H / I / J | F / FF / G / GG | G / H / I / J | Maximum Support Everyday Bra |
How to Measure Your Bra Size Accurately
Step 1: Measure Your Underbust (Band Size)
- Wrap a flexible measuring tape directly underneath your breasts around your ribcage.
- Ensure the tape is level across your back and fits snug against your body without compressing your skin.
- Record the measurement in inches. If it is an odd number, round up to the nearest even number.
Step 2: Measure Your Bust (Cup Size)
- Measure around the fullest part of your bust while standing naturally.
- Keep the tape comfortably loose and parallel to the floor.
Step 3: Calculate the Cup Volume Difference
Subtract your underbust (band) measurement from your bust measurement:
- 1 Inch Difference: A Cup
- 2 Inches Difference: B Cup
- 3 Inches Difference: C Cup
- 4 Inches Difference: D Cup
- 5 Inches Difference: DD (US) / E (UK)
Understanding "Sister Sizes" for a Better Fit
Sister sizes share the same cup volume despite having different band measurements. Understanding sister sizes helps when a bra band feels slightly too tight or too loose, but the cup volume feels perfect.
- Up a Band, Down a Cup: If a 34C band feels too tight, try a 36B. The cup volume remains identical while giving your ribcage more room.
- Down a Band, Up a Cup: If a 36C band feels too loose and rides up your back, try a 34D.
Detailed Pros & Cons of Using a Bra Size Chart
Pros:
- Eliminates Online Shopping Guesswork: Reduces product returns and exchanges when ordering from global stores like Amazon.
- Prevents Physical Discomfort: Wearing the correct size prevents strap digging, back pain, and underwire irritation.
- Enhances Clothing Silhouette: Proper support ensures clothes drape smoothly over the bust line.
Cons:
- Brand Inconsistencies: Sizing can vary slightly depending on fabric elasticity, padding level, and seam construction.
- Requires Regular Re-Measurement: Weight shifts, hormonal changes, and age affect tissue distribution, requiring periodic checks.
Frequently Asked Questions (FAQs)
What is the difference between US and UK bra cup sizes?
US and UK sizing are identical up to DD. Above DD, UK sizing uses double letters (DD, E, F, FF, G), whereas US sizing progresses as DD, DDD/F, G, H, I.
Why does my bra size feel different in a sports bra versus an underwire bra?
Sports bras use high-compression fabric to limit bounce, which often makes the band feel firmer than a standard lace or cotton T-shirt bra in the same labeled size.