Understanding 30C Bra Size
A 30C bra size is considered a small band size with a full cup size. This size is perfect for people with a petite frame and fuller breast volume. Let's explore what makes this size unique and how to find the perfect fit.
Is 30C considered big or small?
Fast facts about 30C
- Snug 30 band with a 3-inch cup jump.
- Standing bust around 32.5–33.5 in keeps the cup filled.
- Share cup volume with 28D, 32B for band tweaks.
- Always scoop-and-swoop and check the gore for a flat anchor.
How 30C is measured
Band fit
Aim for a snug 28.5–29.5 in underbust so the 30 band stays level without digging.
Cup depth
Standing bust in the 32.5–33.5 in range keeps roughly a 3-inch cup difference.
Support focus
Choose firm wings, fully adjustable straps, and swap sister sizes if the band shifts during wear.
30C bust size in inches
| Measurement | Typical inches | How to capture it |
|---|---|---|
| Snug band (ribcage) | 28.5–29.5 in | Measure firmly under the bust on an exhale, then round to the band label. |
| Standing bust | 32.5–33.5 in | Keep the tape level across the fullest point while standing tall. |
| Band-to-bust difference | ≈3 in | Subtract your snug band from the standing bust to confirm cup depth. |
| Approx. cup depth | 4.5–5.5 in | Measure from the underwire root to the apex on a well-fitting bra. |
30C bust size in centimeters
| Measurement | Typical cm | How to capture it |
|---|---|---|
| Snug band (ribcage) | 72.4–74.9 cm | Measure firmly beneath the bust, then map it to EU/FR/JP band labels. |
| Standing bust | 82.6–85.1 cm | Keep the tape level across the fullest point without compressing tissue. |
| Band-to-bust difference | ≈7.6 cm | Use the difference to double-check your metric cup depth. |
| Approx. cup depth | 11.4–14 cm | Trace from underbust to apex on a supportive bra to check projection. |
- Sits below the most common band range of 32-36, so the cups rest on a petite frame.
- Adds more projection than A-B cups, particularly noticeable on narrow bands.
- Monitor posture and band tension—small shifts change how the size looks.
- Try sister sizes 28D, 32B to fine-tune band tension.
Quick reference for 30C
- 30C ≈ band 30 label with a 3-inch cup step.
- Projected bust lands around 32.5–33.5 in.
- Use the calculator to convert this size across US/UK/EU/JP systems.
Ranges are approximations—double-check your own measurements for precision.
30C across popular sizing systems
Match US 30C to the most searched regional labels without leaving this guide.
Currently showing the United States (US) label — copy 30C to match tags instantly.
United States (US)
30C
United Kingdom (UK)
30C
Europe (EU)
65C
France (FR)
80C
Japan (JP)
70C
Australia (AU)
8C
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
- Petite frames
- Smaller ribcages
- Fuller breast volume
- Enhanced support needs
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 30C tends to look
30C pairs a 30-band with a 3-inch cup jump, so the silhouette changes with your frame and bra style.
- Keep 28D, 32B 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.
30C compared with nearby sizes
Quick reference when you’re deciding whether to change the band, the cup, or both.
- 30B is one cup shallower—switch when 30C wrinkles along the neckline.
- 30D adds depth while keeping the band snug if you spill out of 30C.
- 28D / 32B keep the same cup volume but tweak band tightness for comfort.
Sister size playbook
- Try 28D when you need tighter or looser band support.
- Try 32B when you need tighter or looser band support.
Fit checks before you buy
When trying on 30C 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 30C questions
What size is 30C in other systems?
30C converts to 30C in UK sizes, 65C in EU, 80C in FR, 70C in JP, and 8C in AU.
What does 30C mean?
30C pairs a 30 band with a cup that is roughly 3 inches deeper than the band measurement.
Which sister sizes match 30C?
30C shares cup volume with 28D, 32B. 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 30C with our tools
Measure with the calculator, compare sister sizes, and review the perception guide for styling tips.