34C vs. 36B Bra Size: Which Is Larger? A Clear Explanation

Understanding bra sizing is key to finding the right fit. A 34C and a 36B are often confused, but they differ in both band and cup volume.

How Bra Sizes Work

• Band Size (number): Measurement around the ribcage, just under the bust (e.g., 34 or 36 inches).
• Cup Size (letter): Represents the difference between the bust measurement and the band measurement. Each inch of difference typically equals one cup size (A=1", B=2", C=3", etc.).

Comparing 34C and 36B

• 34C: Band = 34″; Cup = C (3″ difference) → Bust ≈ 37″.
• 36B: Band = 36″; Cup = B (2″ difference) → Bust ≈ 38″.

Result: The 36B has a larger band (36″ vs. 34″), but the 34C has a larger cup volume (3″ vs. 2″ difference). In terms of overall breast volume, the 34C holds more breast tissue because the cup is deeper. However, the 36B fits a wider ribcage. They are sister sizes—the cup volume is similar but not identical; 34C is slightly larger in cup volume.

For the best fit, get professionally measured or use a brand's size chart.