Determine the reliability of your contraceptive method with our free Pearl Index Calculator. Understand failure rates based on unintended pregnancies and total exposure time. A crucial tool for family planning and reproductive health decisions. Accurately assess the effectiveness of birth control methods.
Formula:
Pearl Index = (P / (W × M)) × 1200
Where:
- P = Number of unintended pregnancies
- W = Total number of women observed
- M = Total months of observation per woman
- 1200 = Factor for standardizing to 100 women-years (100 women × 12 months)