What is cup size and how is it determined?

Cup size represents the difference in inches between your bust measurement and your band measurement. Each inch of difference corresponds to one cup letter: 1 inch = A, 2 inches = B, 3 inches = C, 4 inches = D, 5 inches = DD/E, and so on.

Can I measure my cup size without knowing my band size?

No. Cup size is always relative to band size. A 34C and a 38C have completely different cup volumes. You must know your band size first to determine your cup size correctly. Use our bra size calculator to find both simultaneously.

Why does my cup size measurement seem wrong?

Common reasons include: measuring over a padded bra, pulling the tape too tight or too loose, not keeping the tape level, or relying on standing bust measurement alone. For D+ cups, a leaning bust measurement often gives more accurate results.

Is cup size the same across different brands?

Not exactly. While the inch-difference formula is standard, cup volume can vary between brands due to different design philosophies on wire width, cup depth, and grading. A 34DD from a UK brand like Panache may fit differently than a 34DD from a US brand like Victoria's Secret.

How to Measure Cup Size Correctly: A Complete Guide

Measurement Guide

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