Birth Control 99.9% Effective?

So if birth control is 99.9% effective, does that mean that I'll get pregnant 1/1000 times I have sex?

2 Answers

Relevance
  • D
    Lv 7
    7 years ago
    Favorite Answer

    Most birth control is not 99.9% effective. However, if it had that level of effectiveness, then statistically 1 in 1000 women would get pregnant on it. That does not translate exactly to 1 in 1000 sexual encounters.

  • 7 years ago

    No. Google "probability" and you'll find out why.

    It means that every time you have sex, you'll have a 1/1000 chance of getting pregnant.

    Every time.

    If you had sex 1000 times, you'd have a chance of 0.01% every single time.

Still have questions? Get your answers by asking now.