Did you know that 80 percent of American women are wearing the wrong bra size? Besides looking less perky than you'd like, an ill-fitting bra can lead to pain in the back, neck and shoulders. Use the guide below to get a great fit every time.

Find the right size bra

1. Find your band size: Measure around your rib cage right below breasts. Round up to the nearest half-inch. Add 4 or 5 to that number (whichever makes the result an even number) to get the band size.
2. Find your cup size: Measure the fullest part of your bust. Subtract the band size from this number to get the cup size. See the chart, below:

1-inch A
2-inch B
3-inch C
4-inch D
5-inch DD or E
6-inch DDD or E or F
7-inch F or G

Note: Sizes will vary depending on the manufacturer.

Make sure your bra fits

1. Lean over and place the underwire under your breasts; the bra should fit against your rib-cage. It should be snug so you feel well supported.

2. Adjust the bra band so it is level across your back. If it slips up high, the bra is too big and could cause back and shoulder pains. Remember: The bra strap should not be carrying the weight of your breasts. Ninety percent of the weight should be carried by the underwire.

3. Fasten your bra at the loosest hook, so that you can tighten it as it ages and the elastic starts to wear. Never over wear your bra or it will lose its elasticity and form -- just like shoes. It's recommended to alternate between two bras in a week, washing after three to four uses.

4. Gently scoop the full weight of your breasts into the cup.

5. For the most comfortable fit, adjust the bra straps. They shouldn't dig into or slip off of your shoulders.

Care for your bras
To make your bras last longer, hand-wash them in cold water using a gentle detergent and leave them to air-dry. If you machine-wash your bras, use a lingerie bag and the delicate cycle.

In-between sizes?

Try Playtex Thank Goodness It Fits bra. It's available in half sizes: Nearly A, A, Nearly B, B, Nearly C and C.
Playtex, $25-$30; at department stores.

Try a minimizer

This bra has stretchy lace, which isn't as confining as heavier Lycra or Spandex panels, but still supports C and D cups. Always look for a thick underwire and wide straps.
Lilyette, $28, sizes S-XXL; at Macy's.

Professional Bra-Fitting:

Most department stores have a bra-fitting specialist who can help you, or, check out: www.intimacyofatlanta.com.