Utility Loft → Bra Size → How to Measure
How to Measure Your Bra Size
Two measurements — band and bust — give you your size. Use a soft tape measure, stand relaxed, and enter the numbers below.
- Band: wrap the tape snugly around your ribcage, directly under the bust, level to the floor. Note the number in inches.
- Bust: wrap it loosely around the fullest part of the chest, keeping it level. Note that number.
- Band size = the underbust rounded to the nearest even number.
- Cup size = bust minus band — roughly one inch per cup letter.
- Enter both in the calculator to get your size in every standard.
Measure the underbust snugly around your ribcage, and the bust around the fullest part, both level to the floor.
Enter your measurements above to get your bra size in every standard.
Tips for an accurate fit
- Measure over a thin, unpadded bra — never a push-up.
- Keep the tape level all the way around, front to back.
- A firm band does the supporting; if in doubt, size the band down and the cup up.
- Try your result next to its sister size — same cups, different band.
Related
Frequently asked questions
How tight should the band measurement be?
Snug and level. The band carries most of the support, so measure firmly around your ribcage directly under the bust — as tight as a well-fitting band would sit — and keep the tape parallel to the floor. A loose band measurement is the most common reason a calculated size comes out too big.
Should I measure with a bra on?
For the band, measure directly against your skin or over a thin non-padded bra. For the bust, wear a lightly lined or unpadded bra so the tape follows your natural shape. Avoid padded or push-up styles, which distort the number.
What if my measurements fall between sizes?
If the band is an odd number, most fitters round down for support and adjust the cup up if needed. If the cup difference lands between letters, try both the calculated size and its sister size to see which cups fit without gaping or spilling.
Why does my calculated size feel wrong?
Bra fit is brand- and style-dependent, and cup lettering above D isn't standardized. Use the calculated size as a starting point, then try it alongside a sister size and the brand's own guide. Bands stretch over time, so a firm fit on the loosest hook when new is ideal.