The effectiveness of birth control at preventing pregnancy depends on the method used and how consistently it is applied. Long-acting reversible contraceptives (LARCs), such as intrauterine devices (IUDs) and contraceptive implants, are over 99% effective, as they require little to no user intervention once in place. Permanent methods like sterilization also have a success rate exceeding 99%. Hormonal methods, such as birth control pills, patches, and vaginal rings, are highly effective when used correctly but may have reduced effectiveness with inconsistent use.

Barrier methods, like condoms and diaphragms, are moderately effective, with typical-use effectiveness rates of 80–85%. Combining these with spermicides or using dual methods, such as condoms along with hormonal contraception, can increase protection. Emergency contraception is available as a backup option but should not replace regular birth control. Consulting a healthcare provider ensures users understand the proper use and effectiveness of each method, helping them choose the best option for their lifestyle and reproductive goals.