How to Calculate Your Bra Size

by Lisa S. Kramer

Calculating your bra size at home will only take a couple minutes.

George Doyle/Stockbyte/Getty Images

Some experts estimate that up to 85 percent of women are wearing the wrong bra size. A properly fitting bra can improve the way you look in clothing and provide comfortable support that does not pinch or cause tell-tale red marks on your shoulders. Calculating your correct bra size is as easy as A,B,C...D.

Step 1

Put on a non-padded bra or go braless. Using a cloth or flexible measuring tape, measure around your chest directly under your breasts, making sure to keep the measuring tape level. Your measuring tape should be snug, but not uncomfortably restrictive.

Step 2

Round the measurement you got in Step 1 to the nearest whole number. If you get an even number, add four inches to it. If you get an odd number, add five inches to it. Write down this measurement. This measurement represents your bra's band size.

Step 3

Use your cloth or flexible measuring tape to measure around the fullest part of your bust while keeping the measuring tape level and slightly loose. Keep your arms down while taking this measurement. Round this measurement to the nearest whole number and then write down this measurement. This measurement represents your bust measurement.

Step 4

Subtract your band size (the measurement you obtained in Step 1) from your bust measurement (the measurement you obtained in Step 3). If the difference in inches is 0, your bra's cup size is a AA. If your measurement is a 1-inch difference, then your cup size is an A cup; if your measurement is a 2-inch difference, then your cup size is a B cup; if your measurement is a 3-inch difference, then your cup size is a C cup; if your measurement is a 4-inch difference, then your cup size is a D cup; if your measurement is a 5-inch difference, then your cup size is a DD cup; if your measurement is a 6-inch difference, then your cup size is a DDD or F; if your measurement is a 7-inch difference, then your cup size is a G cup.

Tips

  • Stand up straight and breathe normally while taking your measurements.

    It may be more accurate to have another person take your measurements for you since your posture will be more natural and relaxed.

    Remeasure your bra size every six months as a weight gain or loss of just five pounds, pregnancy, nursing and menopause can affect your bra size.

Photo Credits

  • George Doyle/Stockbyte/Getty Images

About the Author

Lisa S. Kramer is a licensed attorney practicing civil litigation and estates and trusts law in southern Florida. She received her Bachelor of Arts in English from the University of Florida, where she graduated Phi Beta Kappa and cum laude. Kramer earned her Juris Doctor from the University of Florida Levin College of Law.