The best way to determine your bra size is to be measured by a Certified Fitter, however, not everyone has that option. Below is a guide (the best way to determine your size is by trial and error) to help you determine your approximate bra size. Nothing can compare to trying bras on and getting the best fit regardless of size.

1. Band Size = While wearing your bra, have someone measure around you just below your breasts. Make sure that your arms are at your side. Take that number and round it to the nearest whole number, up or down. If it is under 33 add 5 and if its over 33 add 3.
Confirm this number by having someone measure just above your breasts with your arms at your side. This number should be the same as the one above.

2. Cup Measurement = While wearing your bra, have someone measure around you making a horizontal line that lines up and across your nipples. For larger breasts that are in the wrong size bra it might be necessary to hold the breast up to have it in a more 'natural position' instead of the nipple being too low. This becomes your cup measurement.
To confirm this number have someone place the end of the measuring tape against your chest bone between your breasts and placing it over your nipple and around to the center of your spine. Multiply this number by two. This number should be the same as the number that you got when you measured across the nipples.

3. Cup Size = Subtract your band size from your cup measurement and the difference will become your cup size.
Difference = Cup Size
1"=A, 2"=B, 3"=C, 4"=D, 5"=DD, 6"=DDD/E, 7"=F, 8"=G, 9"=H, etc
Keep in mind that different styles and brands have different cup size allocations and use different sizing terms.

Other helpful tips!

1. Band creeps up!
• The band should provide 80-90% of the support to your breasts.
• The band size may be too large. Try the next size down. The band should be comfortable and fit snugly against you making a straight horizontal line around your body.
• Try loosend the shoulder straps, they may be too tight.
• The bra may be old and stretched out. Try a new bra

2. Shoulder straps falling off!
• Straps may be too loose so try to tighten the straps.
• Bra cups maybe too wide-set, try a smaller band or cup size or even a different style.
• Bra may be old and stretched out. Try a new bra.
• One shoulder may be higher than the other

3. Shoulder straps are digging in!
• Straps should provide only 10-20% of the support.
• Band size may be too large. Try a smaller band size.
• Try loosen straps, they may be too tight.

4. Baggy, Loose or Wrinkly Cups!
• Cup size may be too large - Try a smaller cup.
• Different size breasts - Fit bra to the larger breast
• Wrong Style - Try a style that has a lower cup line.

5. Uneven Breasts!
• Approximately 62% of women have a larger breast
• 10% have a large difference between their breasts
• Fit your bra to the larger breast
• Tighten the strap of the smaller breast to keep the cup from sagging
• Try a moulded or lined bra.
• Try a silicone insert or cookie.

6. Underwire is attacking me!
• Centre front is lifting away from you and not sitting flat against the chest wall - Try a larger cup. The wires should rest comfortably between the breasts on the chest wall creating two seperate breasts.
• If the wires are pinching or poking you, which often occurs at the underarm area - Check the sides of the cup to see if the underwire is encasing your entire breast. Try a larger cup size or even a different style.
• Underwire has come out - #1 reason is washing in the washing machine. Bra is old and worn out or it may be the wrong size or style for you.

7. Overflowing cups!
• Cup size may be too small. Try a larger size or even a different style with a higher cup line.
• Try a shirt on over your bra to check for bulges.
• These tips are given as suggestions only.

8. Breat tissue falling out the bottom!
• Band may to too large - Try a smaller band.
• Cup size may be too small - Try a larger cup.

9. Overstretched Band!
• If you notice your elastic property breaking in your bra or your band's shape is really distorted.
• Try a larger band or even just a looser hook setting.

10. You've tried everything!
• Darting the cup - If you notice a pucker in your smaller breast cup, simply make a small dart near the centre of the bra to pull the top seam smooth.
• Stitching the straps - If you're not ready to replace your favorite bra and the straps will no longer stay tight, sew a few stitches into the strap to keep it tight.
• Bra strap extenders - If you have gained some weight (pregnancy) a bra strap extender lets you loosen the band so that the bra is more comfortable.
• Altering a bra - many people don't think of altering a bra the same way you do pants or other pieces of clothing. Talk to a knowledgeable tailor.
• Custom made bras - There are cases where a custom made bra is definately the better fit. These can be pricey and there may be a waiting list, but check around. A good fit is a good investment.
• Nipple Petals - If you find you have a problem wtih protruding nipples or nipple chaffing try the petals.
• Sport Shield - If you have chaffing on shoulder straps, around your band or any other place on your body during exercise this personal anti-fiction roll on is a must try.