Bra Size Guide: What 34B/36C & 75B/80C Mean

Quick Answer (Summary)

If you see sizes like 34B, 36C, 75B, 80C, here’s what they mean in a simple way:

• The number is your band size (your ribcage measurement under the bust).

• The letter is your cup size, guided by the difference between over bust and underbust.

• In VEIMIA’s reference chart:

  • 34 = underbust 72.5–77.5 cm (often labeled 75 in cm-based systems)

  • 36 = underbust 77.5–82.5 cm (often labeled 80 in cm-based systems)

If you’re between two sizes, prioritize band comfort and stability first, then adjust cup.

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What do bra sizes mean?

A bra size has two parts:

• Band size (number): how wide your band is (measured under the bust).

• Cup size (letter): based on how much larger your over bust is compared to your underbust.

Important: Cup letters are not “absolute.” A “C cup” changes volume when the band changes.

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How to measure your bra size at home (3 steps)

You only need a soft measuring tape.

Step 1 — Measure underbust (band)

Stand straight. Wrap the tape snugly around your ribcage right under the bust. Keep the tape level.

Step 2 — Measure over bust (VEIMIA method)

Lean forward slightly (about 45°). Wrap the tape around the fullest part of the bust, surrounding the nipple area in a circle. Keep the tape level and avoid pulling too tight.

Step 3 — Use underbust + difference to find your size

1. Match your underbust to the correct band range

2. Calculate (over bust − underbust) to find your cup difference

3. Use both to choose your recommended size

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Band conversion: 34/36 vs 75/80 (VEIMIA reference)

VEIMIA’s band labels follow these underbust ranges:

Quick takeaway:

• Underbust 72.5–77.5 cm → band 34 (often labeled 75)

• Underbust 77.5–82.5 cm → band 36 (often labeled 80)

 

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Cup guide: over bust–underbust difference (VEIMIA reference)

VEIMIA’s chart uses the difference between over bust and underbust to guide cup letters:

How to use this:

• Find your band from your underbust range

• Calculate your difference (over bust − underbust)

• Match the difference to the cup letter

Example: If your underbust falls into the 34 band range and your difference is 15 cm, you can start with 34C (often labeled 75C).

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Sister sizes: fix band comfort without changing cup volume

If your cups feel right but the band doesn’t, use sister sizing:

• Band too tight → band up + cup down
  Example: 34C → 36B

• Band too loose → band down + cup up
  Example: 36B → 34C

This helps you keep a similar cup volume while improving comfort.

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Fit troubleshooting: why the “right size” can still feel wrong

Even when measurements look correct, fit can vary because of:

• Different bra styles (plunge, full coverage, minimizer)

• Band stretch and fabric

• Cup shape (shallow vs projected)

• Body changes (cycle, posture, daily swelling)

If something feels off, troubleshoot in this order:

1. Band stability (does it ride up?)

2. Cup containment (spillage or gapping?)

3. Straps (should support, not carry all weight)

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FAQ (Most asked questions)

1) Is 75C the same as 34C?

In VEIMIA’s reference chart, 34 corresponds to underbust 72.5–77.5 cm, which is commonly labeled 75 in cm-based systems. So 75C and 34C are often treated as equivalents when your underbust falls in the correct range.

2) What is a 36B equivalent to?

A common sister size for 36B is 34C (band down + cup up). Choose based on whether the band feels too loose or too tight.

3) How do I know if I should choose 34 or 36?

Use your underbust:

• 72.5–77.5 cm → 34

• 77.5–82.5 cm → 36
  If you’re exactly on the border, consider comfort preference and whether the band runs snug in that style.

4) Why does my bra ride up in the back?

A riding-up band often means the band is too loose, or the cups don’t contain tissue properly, causing the bra to shift. Try a firmer band (band down + cup up) or a better cup shape.

5) My band feels tight—should I size up?

If the cups fit well but the band is uncomfortably tight, try a sister size (band up + cup down). Also make sure you start on the loosest hook and check whether the style runs snug.

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Summary: your 60-second checklist

• Measure underbust + over bust

• Use underbust range to pick band

• Use difference to pick cup

• If needed, use sister sizing for comfort

Next steps (recommended):

 

• VEIMIA Bra Size Chart: