Why do bra sizes differ by country?

Different countries developed their own sizing systems over time. US and UK use similar band measurements but may have slight cup differences. EU uses a different band numbering system (adding 10-15 to US sizes), while FR and JP have their own unique approaches based on local preferences.

How accurate are international bra conversions?

Our conversions are based on industry standards and are generally accurate for most brands. However, some brands may have slight variations, so it's always recommended to try on bras when possible or check the specific brand's size chart for the most accurate fit.

What's the difference between band and cup size?

The band size is the measurement around your ribcage (in inches or centimeters), while the cup size represents the difference between your bust and band measurements. For example, a 34B means a 34-inch band with a B cup (2-inch difference between bust and band).

International Bra Size Converter - Global Bra Size Conversion

International Bra Size Converter

Convert bra sizes between all major international regions including US, UK, Europe, France, Japan, Australia, Italy, and Spain.

Size Converter

Select your current size and system

Region

Band Size

Enter band (28-50)

Cup Size

Enter cup letter (A-Z)

Converted Sizes

International Sizes

Reference Table

Complete size conversion chart

US	UK	EU	FR	JP	AU	IT	ES
26A	26A	55A	70A	A55	4A	0A	70A
26B	26B	55B	70B	B55	4B	0B	70B
26C	26C	55C	70C	C55	4C	0C	70C
26D	26D	55D	70D	D55	4D	0D	70D
26DD	26DD	55DD	70DD	DD55	4DD	0DD	70DD
28A	28A	60A	75A	A60	6A	0.5A	75A
28B	28B	60B	75B	B60	6B	0.5B	75B
28C	28C	60C	75C	C60	6C	0.5C	75C
28D	28D	60D	75D	D60	6D	0.5D	75D
28DD	28DD	60DD	75DD	DD60	6DD	0.5DD	75DD
30A	30A	65A	80A	A65	8A	1A	80A
30B	30B	65B	80B	B65	8B	1B	80B
30C	30C	65C	80C	C65	8C	1C	80C
30D	30D	65D	80D	D65	8D	1D	80D
32A	32A	70A	85A	A70	10A	2A	85A
32B	32B	70B	85B	B70	10B	2B	85B
32C	32C	70C	85C	C70	10C	2C	85C
32D	32D	70D	85D	D70	10D	2D	85D
32DD	32DD	70E	85E	E70	10DD	2DD	85E
34A	34A	75A	90A	A75	12A	3A	90A
34B	34B	75B	90B	B75	12B	3B	90B
34C	34C	75C	90C	C75	12C	3C	90C
34D	34D	75D	90D	D75	12D	3D	90D
34DD	34DD	75E	90E	E75	12DD	3DD	90E
36A	36A	80A	95A	A80	14A	4A	95A
36B	36B	80B	95B	B80	14B	4B	95B
36C	36C	80C	95C	C80	14C	4C	95C
36D	36D	80D	95D	D80	14D	4D	95D
36DD	36DD	80E	95E	E80	14DD	4DD	95E
38B	38B	85B	100B	B85	16B	5B	100B
38C	38C	85C	100C	C85	16C	5C	100C
38D	38D	85D	100D	D85	16D	5D	100D
38DD	38DD	85E	100E	E85	16DD	5DD	100E
40B	40B	90B	105B	B90	18B	6B	105B
40C	40C	90C	105C	C90	18C	6C	105C
40D	40D	90D	105D	D90	18D	6D	105D
40DD	40DD	90E	105E	E90	18DD	6DD	105E

Frequently Asked Questions

👙 How to Measure Your Bra Size

Finding the perfect fit starts with accurate measurements. Wear a non-padded bra (or no bra) and use a soft measuring tape. Stand straight and breathe normally.

1. Measure Band Size

How to measure bra band size - measuring tape snug around ribcage under bust

Wear a non-padded bra or go braless.
Wrap the measuring tape snugly around your ribcage, directly under your bust.
Ensure the tape is level and parallel to the floor.
Round to the nearest whole number (e.g., 34 inches).

2. Bust Measurement

Measure around the fullest part of your bust.
Keep the tape parallel to the floor.
Don't pull too tight – just snug enough to stay in place.

🧮 3. Calculate Cup Size

Subtract Band Size from Bust Size

1 inch

A Cup

2 inches

B Cup

3 inches

C Cup

4 inches

D Cup

Fit Check: Is it the Right Size?

✅ Band

Should sit level on your back and fit 2 fingers underneath.

✅ Cups

No spilling over (quad-boob) or gaping empty space.

✅ Straps

Should stay put without digging into your shoulders.

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🛡️ Our Methodology & Sizing Accuracy

Standardized Data: Our browser-based calculator uses the +0" vs +4" logic adaptation to ensure modern fit accuracy. We verify international cross-grade charts against major lingerie manufacturers including Victoria's Secret, Triumph, and Marks & Spencer.

Regional Logic: We explicitly differentiate between EU (centimeters) and FR/ES sizing (which adds a 15cm offset). Australian sizes are mapped to their UK equivalents for cup depth correctness.

Sister Size Algorithm: Our tool understands cup volume continuity. When calculating, we prioritize the "Sister Size" relationship to help you find a comfortable band fit without losing cup volume.

Regular Updates: Sizing standards evolve. We review our conversion logic quarterly to align with changes in global manufacturing tolerances.

💡Quick Answer

Bra sizing systems vary globally. While US and UK use inches, Europe and Japan use centimeters. Cup progressions also differ (e.g., US uses DDD, UK uses E). Use our converter to navigate these differences.