Quick Answer

To measure your bra size, you need two numbers: your band size and your bust size. Use a soft measuring tape, measure directly under your bust for the band, and around the fullest part of your chest for the bust. Subtract the band from the bust to find your cup size. Always remeasure every six months or after weight changes.

Why Accurate Bra Measurement Matters

Wearing the wrong bra size can cause discomfort, poor support, and even shoulder or back pain. A well-fitted bra not only feels better but also improves the silhouette of your clothes. Most women wear a band size that is too large and a cup size that is too small, so measuring correctly is the first step to a better fit.

Bra sizing can vary between brands, but the basic measurement method stays the same. Once you know your numbers, you can adjust for different styles. For example, a balconette bra may fit differently than a plunge bra, so always try on when possible.

Step-by-Step Bra Measuring Guide

  1. Measure Your Band Size: Wrap a soft measuring tape snugly around your ribcage, directly under your bust. The tape should be level and tight enough that it doesn't slide down. Round the measurement to the nearest whole number. If it's an even number, that's your band size. If it's odd, add 4 inches (or 5 if you prefer a looser fit). Common mistake: measuring too loosely. The band should be firm but not digging in.
  2. Measure Your Bust Size: Stand straight and wrap the tape around the fullest part of your chest, usually at nipple level. Keep the tape parallel to the floor and not too tight. Round to the nearest whole number. Checkpoint: make sure the tape isn't slipping down at the back.
  3. Calculate Your Cup Size: Subtract your band size from your bust measurement. Each inch difference equals one cup size: 1 inch = A, 2 = B, 3 = C, 4 = D, 5 = DD/E, 6 = DDD/F, and so on. If your difference falls between two sizes, try both cup sizes to see which fits better.
  4. Test the Fit: Put on a bra and check the band: it should stay level and not ride up. The center gore should lie flat against your sternum. Cups should fully contain your breast tissue without spillage or gaps. Adjust straps so they're snug but not digging. Common mistake: relying only on the straps for support. The band should do 80% of the work.
  5. Re-Measure Regularly: Your bra size can change due to weight fluctuations, pregnancy, or aging. Re-measure every six months or whenever your bras start feeling uncomfortable. Also, replace bras every 6-12 months as elastic wears out. Checkpoint: if your band rides up or straps slip often, it's time to remeasure.

Products That Complement a Great Fit

  • Everly Emerald Brief: Featuring Swiss-designed embroidery and charming French florals, Everly pulls focus with custom flower crystals, deep emerald accents, and shimmering green lurex. Once you know your correct bra size, you can confidently shop for beautiful lingerie like the Everly Emerald Brief, which relies on precise sizing for its structured fit and decorative details.
  • Chastity Navy Brief: Chastity is back and she’s now in Navy! Rising to all occasions and always ready to conquer, this is the ultimate bondage collection made with padlocks, keys, plates and chains. For adventurous styles like the Chastity Navy Brief, a correct measurement ensures the straps and locking plates sit comfortably and securely, avoiding any pinching or slipping.