Birth Control Effectiveness Calculator

Your details

Choose the main method you use or are considering.
Typical use reflects real-world behaviour including occasional misuse or missed doses.
Add a backup method to see combined effectiveness, e.g. pill + condom.
Applies only when a second method is selected.
How many months to calculate cumulative pregnancy probability for.
months
Pregnancy probabilityHigh effectiveness
6.78%

Chance of at least one unintended pregnancy over your chosen timeframe

Pearl Index7per 100 women-years
Effectiveness93%
Estimated annual cost$240
Pregnancy probability (perfect use)0.3%
Effectiveness (perfect use)99.7%
93% effectiveness
Lower<80%Moderate80%-93%High93%-99%Very high99%+

About 6.78% chance of pregnancy over 12 months, with 93.0% effectiveness per year.

  • Your method has a Pearl Index of 7.00, meaning about 7.0 pregnancies per 100 women using it for one year.
  • With perfect use every time, effectiveness rises to 99.7%. Consistent, correct use makes a real difference.
  • Estimated out-of-pocket cost is about $240 per year, before insurance.

Next stepThis is a highly effective method. Ask your provider how to minimise the gap between typical and perfect use.

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