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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.

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Date of Conception

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30 thoughts on “Safe Days Calculator

  1. Herodia08 says:

    THIS IS VERY ACCURATE

  2. Be6-caNT says:

    This cycle is the best it works really accurately

  3. King says:

    I don’t understand the meaning of safe days to conceive

  4. AHMED LAHMAR says:

    I wanna buy this plugin to use it on my website but I don’t know how to set up different calculator do you have any documentation

  5. Belle says:

    Green Colored Days (Safe Days to Conceive) – does it mean these are also days of not getting pregnant? Thanks.

  6. maneno mercy says:

    I did not understand the meaning of safe to conceive does it mean on that day I have the chance to concieve or not

  7. Gladys says:

    Are red the safe days

  8. Jean says:

    What is safe days to conceive and conventionally safe days?

  9. Rylee says:

    Don’t get where to look for information it’s calculated

  10. Oluchi says:

    I don’t understand safe days to conceive what does it mean please