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30B Bra Size - UK, EU and Sister Size Conversions
Everything about the 30B bra size: international conversions, sister sizes, and how to check your fit.
Underbust
29-31 in / 74-79 cm
Bust
31.5-32.5 in / 80-83 cm
These are the body measurements that typically map to 30B. Measure to confirm because brands vary.
Last updated: July 9, 2026
US bra size
30B
- UK
- 30B
- EU
- 65B
- FR
- 80B
- AU
- 8B
Snugger band
Outside the active MVP range.
Is 30B big or small?
30B combines a 30 band, which is on the smaller end of this MVP band range, with B, which is a lower cup step. Cup letters are relative to band size, so fit can still vary by brand and style.
People often search "is 30B big" or "is 30B small", but the answer depends on both the 30 band and B cup step. Use the size label as a starting point, then confirm it with a real fit check.
What does 30B mean?
In 30B, the 30 is the band size: it describes the measurement around your ribcage under the bust. The B is the cup step, and cup volume changes with the band, so B on a 30 band is not the same volume as B on every other band.
For this dataset, 30B sits at a smaller cup step in this size range. Use that as context, not as a judgment about your body or shape.
How to tell if your 30B fits
- The band should stay level across your back when you move.
- Cups should hold breast tissue without spilling, gapping, or wrinkling.
- The center gore should sit close to your body if the style has wires.
- Straps should help shape the fit, not carry most of the support.
30B sister sizes explained
Sister sizes adjust the band and cup in opposite directions, which can keep the cup volume close while changing how firm the band feels. For 30B, nearby sister sizes include 32A.
Use the sister size finder when the cup feels close but the band needs a better fit, or read sister sizes explained for when the idea helps and where it stops.
Bra styles by breast shape
The same 30B can look and fit differently depending on breast shape. Round, teardrop, east-west, and other shapes suit different bra styles.
Common fit problems in 30B
Band rides up
If a 30B band rides up, use the sister-size finder to look for a snugger band.
Cup gaps
If the cup has empty space, compare 30A or a shallower bra shape before changing the band.
Cup spills
If tissue spills over the edge, compare 30C or a fuller-cup style.
Band feels too tight
If the cup volume feels close but the band feels too firm, compare 32A.
Convert 30B to another system
Bra size charts for 30B
Use the chart pages when you want to compare 30B against full country size tables instead of opening one conversion at a time.
Popular 30B searches
Related sizes
Bra styles that work well for 30B
- For 30B, a firmer adjustable band can help small-band sizes feel secure.
- Because B is relative to the 30 band, shallow or lightly lined cups may reduce extra space.
- If the cup edge gaps or cuts in, compare the shape as well as the size label.
- If the band feels right but cup space is off, compare 30C as a nearby cup step.
FAQ
Is 30B a big or small bra size?
30B depends on both the 30 band and the B cup step. Cup letters are relative to band size, so it is more useful to focus on fit than on whether a size sounds large or small.
What does 30B convert to in UK sizing?
In this sizing table, 30B converts to UK 30B. Brand charts can still differ, so check the retailer's chart before buying.
What sister size should I try from 30B?
If the band feels tight, try 32A. If the band rides up, try the next snugger band with a larger cup step.
What measurements usually make 30B?
30B usually maps to an underbust around 29-31 in / 74-79 cm and a bust around 31.5-32.5 in / 80-83 cm. Use these as calculator-aligned starting measurements, then confirm the fit because brands vary.
Why is my UK bra size different from my US size?
US and UK cup labels do not always move in the same sequence, especially after D. A conversion is a guide, not a replacement for trying the bra on.
How accurate is an online bra size calculator?
It can give you a sensible starting point from your measurements. Shape, style, fabric, and brand sizing still decide whether the bra actually fits.
Bras in your size
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