The Ultimate US Bra Size Calculator Guide

Welcome to your specialized guide for finding the perfect bra fit in the United States. Navigating US bra sizing can be challenging due to brand inconsistencies and unique measurement systems. This guide, combined with our calculator, is designed to give you clarity and confidence. We believe this is the best bra size calculator for US fittings because it's accurate, easy to use, and packed with essential information.

Understanding US Bra Size Measurements

The core of any accurate US bra size calculator relies on two simple measurements: the band and the bust. The standard US method, which our calculator uses, is as follows:

  • Band Measurement: Measure your underbust in inches. If the number is even, add 4 inches. If it's odd, add 5 inches. This is your band size. (Note: Many modern brands now recommend using the raw underbust measurement, rounded to the nearest even number. Our calculator's logic is based on the chart data for maximum compatibility.)
  • Bust Measurement: Measure the fullest part of your bust.
  • Cup Size: The difference between your bust measurement and your calculated band size determines your cup. A 1-inch difference is an A cup, 2 inches is a B cup, and so on.

Bra Size Calculator for USA Plus Size

Finding a comfortable and supportive fit is especially crucial for plus-size individuals. Our bra size calculator for USA plus size is designed to be inclusive and accurate across a wide range of body types. When measuring, ensure the tape is not digging into your skin but remains snug and level. Key things to look for in a good plus-size fit are a band that doesn't ride up, cups that fully contain breast tissue without spillage, and wide, comfortable straps that don't dig into your shoulders.

Effortless US to UK & EU Bra Size Conversion

Shopping online or from international brands is easier than ever, but sizing can be a headache. Our tool acts as a US to UK bra size calculator and a bra size calculator for EU to US conversions automatically.

  • US to UK: Band sizes are identical (e.g., 34 is 34). However, cup sizes diverge after DD. A US DDD is a UK E, a US G is a UK F, and so on. Our calculator handles this complex conversion for you.
  • US to EU: This is completely different. The EU system uses centimeters and doesn't add inches to the band. For example, a US 32 band is roughly equivalent to an EU 70. Our results table provides your precise EU size.

Discover Your Options with a Sister Size Bra Calculator (US)

What if your calculated size isn't quite right? This is where the sister size bra calculator for US sizes becomes invaluable. Sister sizes are alternate sizes where the cup volume is the same. The rule is simple: go down a band size and up a cup size, or vice versa.

For example, if you are a 36C:

  • Your "smaller" sister size (tighter band, larger cup) is 34D.
  • Your "larger" sister size (looser band, smaller cup) is 38B.

Our results automatically include a sister size chart to give you more options when shopping, ensuring you find the most comfortable fit possible.