Understanding 48B Bra Size
A 48B bra size is considered a large band size with a moderate cup size. This size is perfect for people with a fuller frame and moderate breast volume. Let's explore what makes this size unique and how to find the perfect fit.
Is 48B considered big or small?
Fast facts about 48B
- Snug 48 band with a 2-inch cup jump.
- Standing bust around 49.5–50.5 in keeps the cup filled.
- Share cup volume with 46C, 50A for band tweaks.
- Always scoop-and-swoop and check the gore for a flat anchor.
How 48B is measured
Band fit
Aim for a snug 46.5–47.5 in underbust so the 48 band stays level without digging.
Cup depth
Standing bust in the 49.5–50.5 in range keeps roughly a 2-inch cup difference.
Support focus
Choose firm wings, fully adjustable straps, and swap sister sizes if the band shifts during wear.
48B bust size in inches
| Measurement | Typical inches | How to capture it |
|---|---|---|
| Snug band (ribcage) | 46.5–47.5 in | Measure firmly under the bust on an exhale, then round to the band label. |
| Standing bust | 49.5–50.5 in | Keep the tape level across the fullest point while standing tall. |
| Band-to-bust difference | ≈2 in | Subtract your snug band from the standing bust to confirm cup depth. |
| Approx. cup depth | 3.5–4.5 in | Measure from the underwire root to the apex on a well-fitting bra. |
48B bust size in centimeters
| Measurement | Typical cm | How to capture it |
|---|---|---|
| Snug band (ribcage) | 118.1–120.7 cm | Measure firmly beneath the bust, then map it to EU/FR/JP band labels. |
| Standing bust | 125.7–128.3 cm | Keep the tape level across the fullest point without compressing tissue. |
| Band-to-bust difference | ≈5.1 cm | Use the difference to double-check your metric cup depth. |
| Approx. cup depth | 8.9–11.4 cm | Trace from underbust to apex on a supportive bra to check projection. |
- Uses a wider band to distribute support across a fuller torso, which can make cups appear more proportionate.
- Close to the statistical average, so it rarely stands out as especially large or small.
- Monitor posture and band tension—small shifts change how the size looks.
- Try sister sizes 46C, 50A to fine-tune band tension.
Quick reference for 48B
- 48B ≈ band 48 label with a 2-inch cup step.
- Projected bust lands around 49.5–50.5 in.
- Use the calculator to convert this size across US/UK/EU/JP systems.
Ranges are approximations—double-check your own measurements for precision.
48B across popular sizing systems
Match US 48B to the most searched regional labels without leaving this guide.
Currently showing the United States (US) label — copy 48B to match tags instantly.
United States (US)
48B
United Kingdom (UK)
48B
Europe (EU)
110B
France (FR)
125B
Japan (JP)
115B
Australia (AU)
26B
Quick converter
Switch systems and copy the exact label for checkout forms or bra tags.
Need step-by-step help? Jump into the dedicated guides below for measurement nuances and shopping tips.
Perfect For
- Fuller frames
- Larger ribcages
- Moderate breast volume
- Balanced proportions
Recommended Styles
T-Shirt Bras
Perfect for everyday wear under fitted clothing
- Seamless
- Molded cups
- Comfortable
Balconette Bras
Great for creating a natural lift and shape
- Wide-set straps
- Lower cut cups
- Enhancing
Plunge Bras
Ideal for low-cut tops and dresses
- Deep V-neck
- Minimal coverage
- Versatile
How 48B tends to look
48B pairs a 48-band with a 2-inch cup jump, so the silhouette changes with your frame and bra style.
- Keep 46C, 50A in mind—they share cup volume while tweaking the band.
- Shape, strap placement, and fabric choice all influence whether the size looks subtle or bold.
48B compared with nearby sizes
Quick reference when you’re deciding whether to change the band, the cup, or both.
- 48A is one cup shallower—switch when 48B wrinkles along the neckline.
- 48C adds depth while keeping the band snug if you spill out of 48B.
- 46C / 50A keep the same cup volume but tweak band tightness for comfort.
Sister size playbook
- Try 46C when you need tighter or looser band support.
- Try 50A when you need tighter or looser band support.
Fit checks before you buy
When trying on 48B bras, look for these key fit indicators:
- The band should fit snugly around your ribcage
- Cups should fully contain your breasts without spillage
- Straps should stay in place without digging in
- The center gore should lie flat against your chest
- Keep the band parallel to the floor on the middle hook.
- Scoop and swoop tissue into the cups before checking the gore.
- Adjust straps for lift, then reassess comfort after an hour of wear.
Remember that fit can vary between brands and styles. Always try on bras before purchasing to ensure the perfect fit.
Common 48B questions
What size is 48B in other systems?
48B converts to 48B in UK sizes, 110B in EU, 125B in FR, 115B in JP, and 26B in AU.
What does 48B mean?
48B pairs a 48 band with a cup that is roughly 2 inches deeper than the band measurement.
Which sister sizes match 48B?
48B shares cup volume with 46C, 50A. Use them to tighten or relax the band.
How can I confirm this is my best fit?
Measure snug and standing bust, check for smooth cup edges, and ensure the band stays level after a few minutes of wear.
Check 48B with our tools
Measure with the calculator, compare sister sizes, and review the perception guide for styling tips.