If you pay your balance in full each month and use your credit card frequently, you may want to consider a credit card with cash-back rewards. The obvious benefit is that you'll earn rebates on what you'd buy anyway.

The trouble is weeding through all the choices and finding the right card. Almost 50 percent of all card offers feature cash-back rewards, according to Synovate Mail Monitor, a global market research firm.

To help you narrow the hunt, Bankrate.com has surveyed 32 popular cash-back rewards cards. A handy chart lists each card, along with annual fee information, any introductory bonus, the reward formula, the cash-back ratio, any expiration period on accumulated rewards and other important details.

In light of the data, here are some tips to help you find the best cash-back credit card.