Dias Férteis
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
fértil
About this calculator
The fertile days calculator is a useful tool to help women understand their menstrual cycle and identify the most fertile days for conception.
This calculator works based on the date of the next expected menstruation and estimates fertile days with a margin of error of ±3 days.
It's worth noting that each woman is unique and her menstrual cycle may vary from one person to another.
Here's the formula in words: fertile.
Frequently asked questions
How does this calculator work?
This calculator uses the date of the next expected menstruation to estimate fertile days with a margin of error of ±3 days.
What are the fertile days?
The fertile days are the 14 days before the next expected menstruation, with a margin of error of ±3 days.
Why is it important to understand the menstrual cycle?
Understanding the menstrual cycle is crucial for planning a pregnancy or avoiding an unplanned pregnancy.
Is this calculator reliable?
This calculator is a useful tool, but it's essential to remember that each woman is unique and her menstrual cycle may vary from one person to another.