Skip to content

Safe Days Calculator

30 comments

This safe days calculator helps you identify the infertile period in a woman’s menstrual cycle when the chances of pregnancy are lowest. By entering the date of the last menstrual period, average cycle length, and menstruation duration, it estimates safe days, fertile days, and ovulation. It can be used both for natural birth control and to plan conception.

Calculate Infertile and Fertile Days in Menstrual Cycle

Input Fields
If enabled, the result will update automatically when you change any value.

Safe and Fertile Days Estimation Formula

Formula
$$\text{Ovulation Date} = \text{LMP} + (\text{Cycle Length} – 14)$$

Fertile window: Ovulation date ± 2 days
Safe days: Before fertile window and after ovulation + 3 days.

The Safe Days Calculator is based on the calendar method and helps in identifying the high and low fertility phases of a woman’s menstrual cycle. It assumes that ovulation happens 14 days before the next period, and the fertile window spans several days around ovulation. By avoiding unprotected intercourse during this window, couples may reduce the risk of unplanned pregnancy. The tool is also helpful for those trying to conceive, by showing the most fertile days. Accuracy depends on cycle regularity.

Previous
Date of Conception

Leave a Reply

Your email address will not be published. Required fields are marked *

30 thoughts on “Safe Days Calculator

  1. Joe says:

    One of the best , if not the best calculator ever used. Keep it up

  2. Maano says:

    When are the honey days exactly?

  3. Lynda says:

    Please help me explain the meaning of the green colored days

  4. Donald William Magati says:

    This will help me to be safe with my girlfriend 😊😉

  5. pius says:

    Need to know more about conception

    1. Blessing says:

      I want to get this application

  6. Charles says:

    Do you have a app, android, send me a link, i would like to install

  7. Dannica Jane says:

    Does convetionally safe days means there’s still a chance to conceived?

  8. Albie says:

    Can u get pregnant two days to menstrate?

    1. I want to down load this application on my phone so dat I will be using it

  9. Olive star says:

    Please help me and explain to me the meaning of the red color then green and the ones without any color

    1. Wpcalc says:

      red color – Menstruation days
      grey color – Conventionally safe days
      pink color – Favorable day for conceiving a girl
      blue color – Favorable day for conceiving a boy
      green color – Safe days to conceive

  10. Safeera says:

    Green numbers: safe days to conceive or not to conceive?

    1. Hope says:

      Does the green number mean safe days not to conceive