The five main categories of birth control are hormonal methods (like the pill), barrier methods (like condoms), long-acting devices (like IUDs and implants), permanent sterilization, and fertility awareness. Each works differently, lasts a different amount of time, and varies widely in how well it prevents pregnancy in real-world use. Here’s what you need to know about each one.
Hormonal Methods: The Pill and the Shot
The combined birth control pill contains two hormones that stop your ovaries from releasing an egg each month. With perfect use, the pill is over 99% effective. In practice, though, most people miss doses or take them at irregular times, which drops effectiveness to about 91%. That gap means roughly 9 out of 100 people using the pill will become pregnant in a typical year.
The injectable contraceptive is another hormonal option. You get a shot every 13 weeks (about three months), which removes the daily routine of taking a pill. The trade-off is a significant side effect: the shot can cause bone density loss that increases the longer you use it and may not fully reverse after stopping. The FDA recommends against using it for longer than two years unless other methods aren’t a good fit for you.
Barrier Methods: Condoms
External (male) condoms are the only birth control method on this list that also reduces the risk of sexually transmitted infections. Latex condoms are highly effective at blocking HIV and STIs spread through genital fluids, like gonorrhea and chlamydia. They’re less protective against infections spread through skin-to-skin contact, such as genital herpes and syphilis, because those can be transmitted by areas the condom doesn’t cover.
For pregnancy prevention alone, condoms are less reliable than hormonal or long-acting methods. Their effectiveness depends heavily on correct, consistent use: putting them on before any genital contact, using the right size, and checking for damage. Many people pair condoms with a second method to get both STI protection and stronger pregnancy prevention.
Long-Acting Reversible Methods: IUDs and Implants
Long-acting reversible contraception, often called LARC, includes IUDs and the contraceptive implant. These are the most effective reversible options available, all topping 99% effectiveness, and they work for years without requiring you to remember anything daily or monthly.
The copper IUD (Paragard) contains no hormones. Instead, copper creates an environment in the uterus that’s toxic to sperm. It prevents pregnancy for up to 10 years and can be removed at any time if you want to become pregnant sooner. Because it’s hormone-free, it’s a common choice for people who experience side effects from hormonal methods.
Hormonal IUDs release a small amount of hormone locally in the uterus, which thickens cervical mucus to block sperm and thins the uterine lining. Different brands last anywhere from three to eight years depending on the model.
The contraceptive implant is a tiny flexible rod inserted just under the skin of your upper arm. It releases a steady, low dose of a hormone that stops ovulation, thickens cervical mucus, and thins the uterine lining. It’s effective for up to five years and is more than 99% effective. Insertion and removal are quick, in-office procedures. Once removed, fertility returns rapidly.
The key advantage of all LARC methods is that there’s almost no gap between “perfect use” and “typical use” effectiveness, because there’s nothing for the user to forget or do wrong once the device is in place.
Permanent Sterilization: Vasectomy and Tubal Ligation
If you’re certain you don’t want future pregnancies, sterilization is over 99% effective for both options. A vasectomy (for the partner with testes) is a simpler procedure with a faster recovery. It involves a small incision or puncture in the scrotum, and the main risks are limited to bleeding, infection, some pain, and a small chance of failure.
Tubal ligation (for the partner with a uterus) is more involved. It requires general anesthesia and a small incision in the abdomen to close the fallopian tubes. Recovery takes longer, and the risks are broader because the surgeon is working near other pelvic organs. There’s also a rare but serious possibility of ectopic pregnancy afterward: if a fertilized egg can’t reach the uterus because the tube is closed, it may begin growing in the fallopian tube itself, which becomes a surgical emergency.
Both procedures should be considered permanent. Reversal surgery exists but is expensive, not always successful, and not covered by most insurance plans.
Fertility Awareness Methods
Fertility awareness involves tracking your body’s natural signals to estimate when you’re fertile each cycle, then avoiding unprotected sex (or using a barrier method) during that window. The signals people track include menstrual cycle dates, basal body temperature taken first thing each morning, cervical mucus changes, and in some cases, urinary hormone levels measured with at-home test strips.
Effectiveness varies enormously depending on which specific method you use and how precisely you follow it. Perfect-use failure rates range from less than 1% to 5%, while typical-use failure rates range from 2% to 34%. That wide spread reflects a real challenge: these methods require consistent daily tracking, and they’re less reliable for anyone with irregular cycles. The most effective versions combine multiple biomarkers (temperature plus mucus, for example) rather than relying on calendar calculations alone.
Fertility awareness is hormone-free and cost-free, which makes it appealing to many people. But it demands more daily effort than any other method on this list, and the margin for error is meaningful. If preventing pregnancy is a high priority, pairing fertility awareness with a barrier method during fertile days significantly improves reliability.
Comparing Effectiveness at a Glance
- IUDs and implants: Over 99% effective, lasting 3 to 10 years depending on the type
- Sterilization: Over 99% effective, permanent
- The pill: Over 99% with perfect use, about 91% with typical use
- Condoms: Less effective for pregnancy prevention than hormonal or long-acting methods, but the only option that also reduces STI risk
- Fertility awareness: Highly variable, from 66% to over 99% effective depending on the method and how consistently it’s followed
The best method is the one you’ll actually use consistently. A theoretically superior option that you skip or forget offers less real-world protection than a simpler method you use every time. If you’re weighing options, the factors that matter most are how long you want protection to last, whether you want hormones involved, and how much daily or monthly effort you’re willing to put in.