STEP (1) BAND SIZE
Measure across the bottom of your band, directly under the bust and across your ribcage. Make sure to keep your measuring tape straight around the back to front. The tape should be snug, not tight. If you get an odd number or half number, round up to the next whole number to get your band size. Whatever number you get here, in almost all cases will need to be rounded up to the nearest even number. So if the measurement is 33 then you would just round up to 34. Very easy. But there is one exception to this rule. If you measure 34 1/4 or even 34 1/2, you should round down to 34 instead. The reason for this is simple. Bras lose elasticity every time you wear them so the fit will only get less and less supportive the longer you wear the bra. So when you first purchase a bra it needs to feel snug but not too tight on the LOOSEST hook.
For this example, the band is 34.
This is where it gets tricky...if you already have a bra on and everything is in the cup and it’s comfortable, you’re done. If not, then let’s continue. Here's how to do it. Measure across your nipples at the widest part of your breasts. If the number falls betweens two numbers, then round up to the.
For example, if you measure 41 1/2 then round up to 42.
STEP (3) CUP SIZE
Now take the number from STEP (1) and subtract the number from STEP (2). This gives you the cup size to go along with the band size that was determined earlier. The band size we had earlier was 34 and the bust measurement is 42. Heres the math: Breast (42) - Band (34) = Cup Size (8"). Every inch equals a cup. In this example, 8" is an H cup.
For example, the bra size is 34H.
NO TWO BRAS ARE ALIKE
Since there is no universal sizing for bras, you may be a 34H in one brand and a 36G or 32I in another one. Our suggestion, try on different brands noting the size you are. It will make shopping a little easier. Below is a chart to help you check your math.
Your bra doesn't fit correctly and you don't know why. Here are some common problems and solutions.
PROBLEM: THE BAND RIDES UP IN THE BACK
Reason: The band is too big
Solution: You need a smaller band
PROBLEM: UNDERWIRE IS DIGGING IN MY ARMPIT
Reason: Your cup is too small, the underwire should encase the entire breast, not dig into it
Solution: You need a bra with a bigger band and/or a bigger cup
PROBLEM: INDENTS IN THE SHOULDER FROM THE STRAPS
Explanation: Your bra is too big in the back and not big enough in the cup; this is causing you to pull the straps up too tight for support
Solution: You need a bra that is smaller in the back and bigger in the cup
PROBLEM: BREAST ARE FALLING OUT AT THE BOTTOM OF THE CUP
Explanation: The band of your bra is too big and the cup may be too small
Solution: You need a bra which is smaller in the back and bigger in the cup
PROBLEM: BUMPY SILHOUETTE UNDER CLOTHES
Explanation: The cup encasing the breast is too small and so causes the breasts to overspill
Solution: You need to increase your cup size until you have a smooth silhouette
PROBLEM: THE CUPS ARE PUCKERING OR WRINKLING
Explanation: You're not properly filling out the cup, because the band and/or the cup size is too large
Solution: You need a bra with a smaller back and/or cup size