Which method of contraception is the most effective?

The most effective methods of contraception are the implant and the IUD (coil). Both are over 99% effective, which means fewer than 1 in 100 people using them will get pregnant in a year.

The reason they're so effective is that once they're fitted, you don't need to do anything. There's no pill to remember, nothing to put on before sex, and no appointments to keep (until it needs replacing). Human error is the main reason contraception fails, and these methods take that out of the equation.

The injection is also very effective (around 96% with typical use), and the pill is about 91% effective with typical use. The gap between the pill's "perfect use" effectiveness (over 99%) and its "typical use" (91%) is mostly down to people forgetting to take it.

Condoms are around 82% effective with typical use. That's lower than hormonal methods, but condoms are the only method that also protects against STIs.

No method is 100%. But the implant and the IUD come closest.

The most effective methods of contraception are the implant and the IUD (coil). Both are over 99% effective.

They work so well because once they are fitted, you do not need to do anything. There is no pill to forget and nothing to put on before sex.

The injection is also very effective. The pill works well too, but only if you take it properly every day.

Condoms are less effective at preventing pregnancy, but they are the only method that also protects against STIs.

No method is 100% perfect. But the implant and the coil come closest.