Bra Measurement Chart – Complete Sizing Reference
Find your perfect fit with our comprehensive bra size charts. Compare US, UK, EU, AU, and FR sizing – plus band conversion, cup comparison, and sister size guide.
Band Size Conversion Chart
Band sizes vary by region. Use this chart to convert your band size across US, UK, EU, AU, and FR systems.
| Underbust (in) | Underbust (cm) | US / UK | EU | AU / NZ | FR / ES |
|---|---|---|---|---|---|
| 26.5 – 28.5 | 67 – 72 | 28 | 60 | 6 | 75 |
| 28.5 – 30.5 | 72 – 77 | 30 | 65 | 8 | 80 |
| 30.5 – 32.5 | 77 – 82 | 32 | 70 | 10 | 85 |
| 32.5 – 34.5 | 82 – 87 | 34 | 75 | 12 | 90 |
| 34.5 – 36.5 | 87 – 92 | 36 | 80 | 14 | 95 |
| 36.5 – 38.5 | 92 – 97 | 38 | 85 | 16 | 100 |
| 38.5 – 40.5 | 97 – 102 | 40 | 90 | 18 | 105 |
| 40.5 – 42.5 | 102 – 107 | 42 | 95 | 20 | 110 |
| 42.5 – 44.5 | 107 – 112 | 44 | 100 | 22 | 115 |
| 44.5 – 46.5 | 112 – 117 | 46 | 105 | 24 | 120 |
| 46.5 – 48.5 | 117 – 122 | 48 | 110 | 26 | 125 |
| 48.5 – 50.5 | 122 – 127 | 50 | 115 | 28 | 130 |
| 50.5 – 52.5 | 127 – 132 | 52 | 120 | 30 | 135 |
| 52.5 – 54.5 | 132 – 137 | 54 | 125 | 32 | 140 |
| 54.5 – 56.5 | 137 – 142 | 56 | 130 | 34 | 145 |
* EU bands are measured in centimetres. FR bands are typically EU band + 15.
Cup Size Conversion Chart
Cup letters vary by region, especially from DD upward. Use this chart to convert your cup size across systems.
| Diff (in) | Diff (cm) | US | UK | EU | AU / NZ | FR |
|---|---|---|---|---|---|---|
| 0 – ½ | 0 – 1.3 | AA | AA | AA | AA | AA |
| 1 | 2.5 | A | A | A | A | A |
| 2 | 5.0 | B | B | B | B | B |
| 3 | 7.6 | C | C | C | C | C |
| 4 | 10.0 | D | D | D | D | D |
| 5 | 12.7 | DD / E | DD | E | DD | E |
| 6 | 15.2 | DDD / F | E | F | E | F |
| 7 | 17.8 | G | F | G | F | G |
| 8 | 20.3 | H | FF | H | FF | H |
| 9 | 22.9 | I | G | I | G | I |
| 10 | 25.4 | J | GG | J | GG | J |
| 11 | 27.9 | K | H | K | H | K |
| 12 | 30.5 | L | HH | L | HH | L |
| 13 | 33.0 | M | J | M | J | M |
| 14 | 35.6 | N | JJ | N | JJ | N |
* US and UK cups match up to D. From DD upward, they diverge.
Complete Bra Size Chart (US)
Find your band in the left column and your cup in the top row. The intersection shows your complete US bra size.
| Cup / Band | 28 | 30 | 32 | 34 | 36 | 38 | 40 | 42 | 44 | 46 |
|---|---|---|---|---|---|---|---|---|---|---|
| AA | 28AA | 30AA | 32AA | 34AA | 36AA | 38AA | 40AA | 42AA | 44AA | 46AA |
| A | 28A | 30A | 32A | 34A | 36A | 38A | 40A | 42A | 44A | 46A |
| B | 28B | 30B | 32B | 34B | 36B | 38B | 40B | 42B | 44B | 46B |
| C | 28C | 30C | 32C | 34C | 36C | 38C | 40C | 42C | 44C | 46C |
| D | 28D | 30D | 32D | 34D | 36D | 38D | 40D | 42D | 44D | 46D |
| DD / E | 28DD | 30DD | 32DD | 34DD | 36DD | 38DD | 40DD | 42DD | 44DD | 46DD |
| DDD / F | 28DDD | 30DDD | 32DDD | 34DDD | 36DDD | 38DDD | 40DDD | 42DDD | 44DDD | 46DDD |
| G | 28G | 30G | 32G | 34G | 36G | 38G | 40G | 42G | 44G | 46G |
| H | 28H | 30H | 32H | 34H | 36H | 38H | 40H | 42H | 44H | 46H |
* Chart shows US sizing. UK cups differ from DD upward – see cup conversion chart above.
Sister Size Chart
Sister sizes have the same cup volume but different band and cup letter combinations. If your size is unavailable, try a sister size.
| Your Size | Sister (Tighter Band) | Sister (Looser Band) |
|---|---|---|
| 28A | — | 30AA |
| 28B | — | 30A |
| 28C | — | 30B |
| 28D | — | 30C |
| 30A | 28B | 32AA |
| 30B | 28C | 32A |
| 30C | 28D | 32B |
| 30D | 28DD | 32C |
| 32A | 30B | 34AA |
| 32B | 30C | 34A |
| 32C | 30D | 34B |
| 32D | 30DD | 34C |
| 32DD | 30DDD | 34D |
| 34A | 32B | 36AA |
| 34B | 32C | 36A |
| 34C | 32D | 36B |
| 34D | 32DD | 36C |
| 34DD | 32DDD | 36D |
| 36A | 34B | 38AA |
| 36B | 34C | 38A |
| 36C | 34D | 38B |
| 36D | 34DD | 38C |
| 36DD | 34DDD | 38D |
| 38A | 36B | 40AA |
| 38B | 36C | 40A |
| 38C | 36D | 40B |
| 38D | 36DD | 40C |
| 38DD | 36DDD | 40D |
| 40A | 38B | 42AA |
| 40B | 38C | 42A |
| 40C | 38D | 42B |
| 40D | 38DD | 42C |
| 42A | 40B | 44AA |
| 42B | 40C | 44A |
| 42C | 40D | 44B |
| 42D | 40DD | 44C |
| 44A | 42B | 46AA |
| 44B | 42C | 46A |
| 44C | 42D | 46B |
| 44D | 42DD | 46C |
| 46A | 44B | 48AA |
| 46B | 44C | 48A |
| 46C | 44D | 48B |
| 46D | 44DD | 48C |
* Sister size rule: Band – 2 = Cup + 1 (tighter band). Band + 2 = Cup – 1 (looser band).
How to Measure Your Bra Size
Follow these simple steps to get accurate measurements for the charts above.
📏 1. Measure Your Underbust (Band)
Wrap a soft tape measure snugly around your ribcage, directly under your bust. Keep the tape level and parallel to the floor. Take the measurement after exhaling normally.
Tip: Round to the nearest even number – e.g., 31" → 32 band.
📐 2. Measure Your Bust (Cup)
Measure around the fullest part of your bust – usually across the nipples. Keep the tape level and don't pull it tight. The tape should sit gently against your skin.
Tip: Take two or three measurements and average them for accuracy.
💡 Formula: Cup Size = Bust Measurement – Band Measurement
1" difference = A cup · 2" = B · 3" = C · 4" = D · 5" = DD · 6" = DDD · 7" = G · and so on.
Quick Reference – Common Conversions
Use this quick reference to convert your size across systems.
| US | UK | EU | FR | AU / NZ |
|---|---|---|---|---|
| 30A | 30A | 65A | 80A | 8A |
| 30B | 30B | 65B | 80B | 8B |
| 30C | 30C | 65C | 80C | 8C |
| 30D | 30D | 65D | 80D | 8D |
| 32A | 32A | 70A | 85A | 10A |
| 32B | 32B | 70B | 85B | 10B |
| 32C | 32C | 70C | 85C | 10C |
| 32D | 32D | 70D | 85D | 10D |
| 34A | 34A | 75A | 90A | 12A |
| 34B | 34B | 75B | 90B | 12B |
| 34C | 34C | 75C | 90C | 12C |
| 34D | 34D | 75D | 90D | 12D |
| 34DD | 34DD | 75E | 90E | 12DD |
| 34DDD | 34E | 75F | 90F | 12E |
| 34G | 34F | 75G | 90G | 12F |
| 36A | 36A | 80A | 95A | 14A |
| 36B | 36B | 80B | 95B | 14B |
| 36C | 36C | 80C | 95C | 14C |
| 36D | 36D | 80D | 95D | 14D |
| 36DD | 36DD | 80E | 95E | 14DD |
| 36DDD | 36E | 80F | 95F | 14E |
| 36G | 36F | 80G | 95G | 14F |
* Quick reference only. Use the full charts above for complete conversions.
Frequently Asked Questions
What is the difference between US and UK bra sizes?
US and UK bands use the same inch numbers (e.g., 34 is 34 in both). However, cup letters differ from DD upward. US DDD = UK E, US G = UK F, US H = UK FF.
How do I convert EU band size to US?
EU bands are measured in centimetres. Subtract 4 from the US band and multiply by 2.54 to get the EU band. For example, US 34 → (34-4) × 2.54 = 76 cm → EU 75.
What are sister sizes?
Sister sizes have the same cup volume but different band and cup letter combinations. If you go down one band size, go up one cup size. If you go up one band size, go down one cup size. For example, 34C → 32D (tighter band) or 36B (looser band).
How is cup size calculated?
Cup size is the difference between your bust measurement and your band measurement. Each inch of difference equals one cup letter: 1" = A, 2" = B, 3" = C, 4" = D, 5" = DD, 6" = DDD, 7" = G, and so on.
Why is my size different in different brands?
Different brands use different fit models, fabric, and construction. Your size may vary by brand – that's why sister sizing and trying on multiple sizes is recommended.
Does IMRango store my measurements?
No. Everything runs locally in your browser. We do not collect, store, or share any of your personal data or measurements.
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Last Updated: August 2026