Make sure the measuring tape is straight and level. Your band size should essentially be your underbust measurement more on that in the next section rounded to the nearest inch. It uses your rounded underbust measurement as your band measurement. Add 5 inches to that measurement to determine your bra size. You can check the bra sizes chart or calculator further up this page to confirm your correct. That actual rib cage measurement no magic number involved is used for the band length.
Bra band sizes go in 2 inch increments. Bra sizes that are the same in volume are often referred to as sister sizes. If you look at bra size charts that take the measurement directly it always tells you to take the measurement wearing a bra that fits. Im 30 in when i measure under my breasts and im 5ft 7in. Straighten the tape so that its parallel to the floor. Thats a 7 difference or a ddddg cup.
I wear a 28g and this fits perfectly but my actual rib cage measurement is 24inches but should i actually find a very rare 26 band bra although it does up fine it does tend to poke into my ribs and ache at the end of the day so 28 is better. While braless or wearing a non padded bra take a measuring tape and measure snugly around your torso directly under your bust at your rib cage. Lets say your underbust measurement is 35 and your overbust measurement is 42. Make sure the tape is comfortably snug and take your measurement to the fullest inch. The combination of bcd and rib cage is your pattern size. Exhale deeplyyou want the smallest measurement possible.
The grey cells in the table below demonstrate how the sizes diagonally adjacent from the top right to the bottom left are the same in breast volume ie. While wearing a bra place the tape measure around your rib cage just below the bust under the bottom bra edge. That measurement in inches will determine your cup and frame size. Its dealing with bra sizes and rib cage size. Your bra size is a us 36ddddg. Round to the nearest whole number and refer to the size chart below.
The same volume of breast tissue spread across different size rib cages band sizes. Wrap a measuring tape snugly around your rib cage just beneath your bustline. I think this is right you just have to try them on until one fits. Your underbust measurement is odd so you add 1 leading to a band size of 36. So 28 inches 30 inches 32 inches and so on. Ensure a good sports bra fit now that youve figured out your estimated band and cup size its time to try on several different brands and styles of sports bras to test the fit.
I cant find the average ribcage size for women. Put on your best fitting non padded bra. Then take your rib cage measurement directly under your bra. Bust measurement 43 inches rib cage measurement 36 inches difference of 7 inches so d cup. For example the bcd might be 40 and the rib cage of 32.