Wrap the tape directly under the bust where the band sits. Keep it snug and level all the way around.
This anchors the band size in most systems.Best for understanding how band and cup references work together.
Bra Size Chart
Compare band and cup references with a practical measurement guide. The page uses professional sizing language and avoids body-shape claims.
Measure and get a size suggestion
Use your own measurements to find the closest reference row, then confirm with the brand chart.
How to measure
Bra- Measure underbust level and snug.
- Measure bust at the fullest point.
- Use the difference for cup reference, then check the brand method.
Your measurements
Closest reference
Enter the measurements you have. A partial result is okay, but more fields give a better match.
Reference only. Product cut, ease, width, material, and brand rules can change the final size.Measurement details
Use a soft tape and a non-padded or lightly padded bra. Keep the tape level and breathe normally.
Measure around the fullest part of the bust without flattening the tissue.
A mirror helps keep the tape from dipping in the back.Use the difference between bust and underbust as the cup reference, then check the regional cup system.
Cup letters are not absolute volumes by themselves.The band should support, cups should not gap or spill, and straps should not carry all the weight.
Sister sizing can help when the band fits but cup volume feels off.| Underbust | Underbust (cm) | US band | UK band | EU band | FR band |
|---|---|---|---|---|---|
| 21-22 in | 53-57 cm | 26 | 26 | 55 | 70 |
| 23-24 in | 58-62 cm | 28 | 28 | 60 | 75 |
| 25-26 in | 63-67 cm | 30 | 30 | 65 | 80 |
| 27-28 in | 68-72 cm | 32 | 32 | 70 | 85 |
| 29-30 in | 73-77 cm | 34 | 34 | 75 | 90 |
| 31-32 in | 78-82 cm | 36 | 36 | 80 | 95 |
| 33-34 in | 83-87 cm | 38 | 38 | 85 | 100 |
| 35-36 in | 88-92 cm | 40 | 40 | 90 | 105 |
| 37-38 in | 93-97 cm | 42 | 42 | 95 | 110 |
| 39-40 in | 98-102 cm | 44 | 44 | 100 | 115 |
| 41-42 in | 103-107 cm | 46 | 46 | 105 | 120 |
| 43-44 in | 108-112 cm | 48 | 48 | 110 | 125 |
| 45-46 in | 113-117 cm | 50 | 50 | 115 | 130 |
| 47-48 in | 118-122 cm | 52 | 52 | 120 | 135 |
| 49-50 in | 123-127 cm | 54 | 54 | 125 | 140 |
| 51-52 in | 128-132 cm | 56 | 56 | 130 | 145 |
How to Measure Band Size
Measure the underbust area with a soft tape held level around the body. The tape should be snug without digging in. Different brands and countries use different rounding methods, so the chart is a starting reference rather than a medical or body-shape recommendation.
How Cup Size Relates to Band Size
Cup letters are not absolute volumes by themselves. A cup label changes with the band size, which is why sister sizing exists. Use the cup reference together with the band row, then compare the result with the brand's own sizing method and product fit notes.
International Bra Size Differences
US, UK, EU, and FR band systems can use different labels and rounding rules. Cup progressions also differ after D in many markets. If you are buying from an international retailer, compare both band and cup systems and review the store's own conversion guidance.
Fit Signs to Review
Sizing charts cannot evaluate comfort on their own. Review whether the band stays level, straps feel supportive without carrying all weight, and the cup edge sits smoothly with the specific garment. For medical, post-surgery, pregnancy, or pain-related concerns, consult a qualified professional.
Band and Cup Need to Stay Together
Bra sizing is often misunderstood because the cup letter is not an absolute volume. A 34D and a 38D do not represent the same cup volume, and sister sizing changes both band and cup together. This chart keeps band systems visible and uses the bust-to-underbust difference as a practical cup reference. It should be paired with a fit check because brands vary in wire shape, cup depth, stretch, and strap placement.
Professional Fit Signals to Watch
A good bra fit is not just a calculated label. The band should sit level and provide most of the support. Cups should not gap at the top, spill at the edge, or flatten the bust. The center gore should sit comfortably for wired styles, and straps should guide rather than carry the full weight. These signals help users understand why a chart result may still need a nearby sister size.
Related Size Tools
Continue with closely related tools instead of jumping through an unrelated directory.
Cup Size Chart
Best for comparing cup letter systems after a band size is already known.
Clothing Size Chart
Best for explaining the difference between body measurements and apparel labels.
Size Chart Generator
Best for merchants who need a product-page size chart quickly.
Shoe Size Chart
Best for using measured foot length as the anchor for international shoe sizes.
FAQ
Is bra size the same in every country?
No. Band labels and cup progression can differ across US, UK, EU, and FR systems.
What is sister sizing?
Sister sizing compares nearby band and cup combinations that can feel similar in volume.
Should I use this chart instead of a brand chart?
Use this as a reference, then follow the brand chart for the exact product.
Does this page provide medical advice?
No. It is a general sizing reference and not medical or body-shape advice.