Índice de Pearl
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
Pearl
About this calculator
The Pearl Index calculator is a useful online tool for healthcare professionals, especially in the field of gynecology and obstetrics. The Pearl Index is a measure used to estimate the effectiveness of a contraceptive method.
The formula to calculate the Pearl Index is simple: (pregnancies·13/cycles)·100. The calculator performs this formula automatically to provide the result.
This calculator is especially useful when evaluating the effectiveness of a contraceptive method in a woman or a group of women. It helps to understand the success or failure rate of the method.
However, it is essential to remember that the Pearl Index is not a perfect measure and may have its limitations. Additionally, it is crucial to consider other factors when evaluating the effectiveness of a contraceptive method, such as the correct use of the method and the presence of risk factors for pregnancy.
Frequently asked questions
What is the Pearl Index?
The Pearl Index is a measure used to estimate the effectiveness of a contraceptive method. It is calculated based on the number of pregnancies or contraceptive failures in relation to the number of cycles of contraceptive use.
When should I use the Pearl Index calculator?
The calculator is useful when evaluating the effectiveness of a contraceptive method in a woman or a group of women. It helps to understand the success or failure rate of the method.
What is a cycle of contraceptive use?
A cycle of contraceptive use is a period of time during which a contraceptive method is used continuously. It can be a month, a quarter, or another defined period of time.
Why is it important to consider risk factors when evaluating the effectiveness of a contraceptive method?
Risk factors, such as the presence of diseases or medical conditions, can affect the effectiveness of a contraceptive method. It is essential to consider them when evaluating the effectiveness of a contraceptive method.