How do I convert bra size from UK to US?

Band sizes are typically the same (e.g., 34 UK ≈ 34 US). Cups align up to D. Above that, UK uses DD, E, F while US may use DD (E), DDD (F). This tool aligns common brand equivalences.

How do I convert EU bra size to US/UK?

EU band sizes are in centimeters (e.g., 75 EU ≈ 34 US/UK; 80 EU ≈ 36 US/UK). Cups map A, B, C, D, E(F), F(G) depending on brand. Use the converter for exact mapping.

How do I measure my bra size at home?

Measure snug underbust for band (inches → round to even), and fullest bust for cup. Cup size = difference between bust and band (1"=A, 2"=B, 3"=C, 4"=D as a general US guide). Brands vary.

In many US brands, DD is equivalent to E. UK often uses letters without double letters after D (DD, E, F). Always check brand charts; this tool shows typical equivalences.

What is 34D in EU sizing?

Typically 34D (US/UK) ≈ 75D (EU). 36D ≈ 80D; 32D ≈ 70D. Use the converter for other bands and cups.

Bra Size Converter (US, UK, EU, AU) – 2025 Instant Chart + Guide

International Bra Size Converter

Region

Band

Cup

Tips

EU/JP bands are centimeters (e.g., 75 EU ≈ 34 US/UK).
DD ≈ E in many US brands. DDD ≈ F.

US

34D

UK

34D

EU

75D

FR

90D

AU

34D

JP

75D

Equivalences are typical for many brands. Always check brand-specific charts.

Quick Examples

International Bra Size Chart (Quick Reference)

Band	Cup	US	UK	EU	FR	AU	JP
32	A	32A	32A	70A	85A	32A	70A
32	B	32B	32B	70B	85B	32B	70B
32	C	32C	32C	70C	85C	32C	70C
32	D	32D	32D	70D	85D	32D	70D
32	DD	32DD	32DD	70E	85E	32DD	70E
32	DDD	32DDD	32E	70F	85F	32E/F	70F
34	A	34A	34A	75A	90A	34A	75A
34	B	34B	34B	75B	90B	34B	75B
34	C	34C	34C	75C	90C	34C	75C
34	D	34D	34D	75D	90D	34D	75D
34	DD	34DD	34DD	75E	90E	34DD	75E
34	DDD	34DDD	34E	75F	90F	34E/F	75F
36	A	36A	36A	80A	95A	36A	80A
36	B	36B	36B	80B	95B	36B	80B
36	C	36C	36C	80C	95C	36C	80C
36	D	36D	36D	80D	95D	36D	80D
36	DD	36DD	36DD	80E	95E	36DD	80E
36	DDD	36DDD	36E	80F	95F	36E/F	80F
38	A	38A	38A	85A	100A	38A	85A
38	B	38B	38B	85B	100B	38B	85B
38	C	38C	38C	85C	100C	38C	85C
38	D	38D	38D	85D	100D	38D	85D
38	DD	38DD	38DD	85E	100E	38DD	85E
38	DDD	38DDD	38E	85F	100F	38E/F	85F

Typical equivalences; brands/styles vary. Use this as a starting point and verify with brand charts.

Complete Guide: How to Convert and Measure Bra Size

Measuring at home

Band: Measure snug under the bust. Round to the nearest even number (US/UK).
Bust: Measure at the fullest point without compressing.
US cup estimate: difference (inches) ≈ cup steps (1"=A, 2"=B, 3"=C, 4"=D).

International band translation

34 (US/UK/AU) ≈ 75 (EU/JP) ≈ 90 (FR)
32 (US/UK/AU) ≈ 70 (EU/JP) ≈ 85 (FR)
36 (US/UK/AU) ≈ 80 (EU/JP) ≈ 95 (FR)

Cup translation (typical)

US: D → UK: D, EU: D, FR: D, AU: D, JP: D
US: DD → UK: DD, EU: E, FR: E, AU: DD
US: DDD → UK: F, EU: F, FR: F, AU: E/F

Fit tips

Band should feel snug on the loosest hook when new.
Cup wrinkles → too large; spillage → too small.
Straps provide support but should not dig in.

Measuring nuances (accurate results)

Tape tension: For the band, the tape should be snug (not loose). For the bust, keep it parallel to the floor.
Posture: Stand straight with normal breathing; avoid measuring after a heavy meal or deep inhale.
Clothing: Measure over a thin, non‑padded bra (or bralette) for best accuracy.

Sister sizes with examples

"Sister sizes" share a similar cup volume but have different band lengths. When the band is too tight/loose, move horizontally:

34D → sister sizes: 32DD (tighter band), 36C (looser band)
32DD → sister sizes: 30DDD/F, 34D
36C → sister sizes: 34D, 38B

Country differences & caveats

EU vs FR: FR bands are EU + 15 (e.g., EU 75 ≈ FR 90).
UK vs US cups: Above D, letter progressions diverge (UK uses DD, E, F; US often DD[E], DDD[F]).
JP bands: Usually mirror EU band numbers; cups follow EU lettering.

Brand & style fit notes

T‑shirt bras run more forgiving in cup shape.
Balconette styles can feel tighter in the band; consider a sister size if in between.
Sports bras may compress; you might prefer one band up, same cup index.

Cup shape considerations

Full on top (FOT): Look for open‑top cups or stretch lace to avoid cutting in.
Full on bottom (FOB): Consider cups with more lower‑cup depth to avoid gaping at the top.
Wide vs narrow wires: Match underwire width to root width for comfort and support.

Troubleshooting common fit issues

Band rides up: Band too loose → go down one band (and up one cup for volume).
Straps dig in: Band is doing too little → try tighter band (sister size) so straps carry less load.
Gore doesn’t tack: Cup too small or too shallow → go up one cup index or try deeper cup styles.

Care & longevity

Hand‑wash or use a lingerie bag on gentle cycle; air dry only.
Rotate bras to allow elastic to recover; expect ~6–12 months of regular wear.

SmartUnitConvert

Bra Size Converter (US, UK, EU, FR, AU, JP)