Learn how to measure your bra cup size accurately with step-by-step instructions and A–K size charts. Find your exact cup size in minutes.

May 16, 2026 · Sister sizes are bra sizes with similar cup volume but different band sizes. The cup letter alone does not represent one fixed volume across all bands, so a 34D cup volume is not the same …

Sep 2, 2024 · Bra size measurements are calculated based on your band size (number) and cup size (letter), which are typically determined by using a tape measure around your rib cage and bust.

Use our 2026 bra size chart calculator to find your exact band and cup size. Includes sister sizes and international conversions.

Sister Size Calculator Enter your current bra size to find sister sizes with similar cup volume and a tighter or looser band. It is the fastest way to compare alternatives when a bra almost fits or your size …

Learn the logic behind bra sister sizes, when to size up or down the band, and how to use the sister size matrix to maintain cup volume.

1 day ago · You may be unaware that every bra size has several "Sister Sizes"- these are sizes which have an equivalent cup capacity, despite the letter of the cup size being different. Knowing your …

Complete bra size guide: every band, every cup, fit problems explained, measurement steps, sister sizes, size charts and research. Free.

Mar 6, 2026 · The size order list appears immediately below, so you can jump straight to finding where you fit on the chart. Bra Sizes in Order From Smallest to Largest Bra sizes grow along two axes: the …

To change both the band and cup size, you'll move diagonally on the chart. Move diagonally down and to the right on the chart for a bigger band and cup. Move diagonally up and to the left for a smaller …