When used consistently and correctly and used every time a couple has sex, the failure rate of latex male condoms is about 3%.
However, typical use -- incorrect and/or inconsistent use -- results in higher unintended pregnancy rates. Typical use, which is the average way they are used, results in a failure rate of 11% to 16%. This means that about 11-16 women per 100 can get pregnant during the first year of use. Condoms used in combination with other methods (birth control pills, IUDs, etc.) further reduce the risk of pregnancy.
Typical use of a female condom can result in unintended pregnancy rates of about 21%; 21 out of every 100 couples may get pregnant during the first year of use. Also under typical use, the rate of pregnancy for women who use a diaphragm and spermicide is 15%; used perfectly, it results in a failure rate of 9%. For those who use an intrauterine device (IUD), the failure rates are about the same, 1%.