Menstrual Calendar Free

The application is based on real scientific researches. It helps you determine your fertile days of the month, so you can either achieve or avoid pregnancy. The calendar uses the date of your last period and shows the next period date, the best days to conceive a girl or a boy, your ovulation day and when you should avoid pregnancy. The application every woman must have!


– The great period tracker on the AppStore that you can trust.
– The only application with correct gender prediction algorithm.

Scientific Research

The application uses real scientific research of Rodrigo Guerrero, 1974 to predict gender of a baby. It’s based on real statistics of thousands and thousands women. As opposed to it the widely-spread Landrum Shettles method is based only on theory and incorrect.

Free or Paid

For minimal price you will get the following benefits on the full version:

– The exact probability of getting pregnant on the current or selected day.
– The exact probability to conceive a girl or a boy at the current or selected day.
– Chance of getting pregnant during all the current period.
– Chance to conceive a girl or a boy during all the current period.

How to Use

To generate your ovulation calendar you should provide the following details:

– Date of the last period (on the main screen).
– Average length of the menstrual cycle (on the Settings screen).
– Length of the luteal phase (on the Settings screen or use the default value).

The application works best for women with regular menstrual cycle. The average cycle length is also a valid way to predict when the ovulation should happen.

App Store

Supported languages: Chinese Simplified, Dutch, English, French, German, Indonesian, Italian, Japanese, Korean, Portuguese, Russian, Spanish, Thai, Turkish, Vietnamese.
Supported devices: iPhone, iPad, iPod and Apple Watch.

Click on the icon to install:

Google Play

Supported languages: Afrikaans, Amharic, Arabic, Armenian, Azerbaijani, Bangla, Basque, Belarusian, Bulgarian, Burmese, Catalan, Chinese Simplified, Chinese Traditional, Croatian, Czech, Danish, Dutch, English, Estonian, Filipino, Finnish, French, Galician, Georgian, German, Greek, Hebrew, Hindi, Hungarian, Icelandic, Indonesian, Italian, Japanese, Kannada, Kazakh, Khmer, Korean, Kyrgyz, Lao, Latvian, Lithuanian, Macedonian, Malay, Malayalam, Marathi, Mongolian, Nepali, Norwegian, Persian, Polish, Portuguese, Punjabi, Romanian, Russian, Serbian, Sinhala, Slovak, Slovenian, Spanish, Swahili, Swedish, Tamil, Telugu, Thai, Turkish, Ukrainian, Vietnamese, Zulu.
Supported devices: Android phones and tablets.

Click on the icon to install:

You can also look at other menstrual calendars: Menstrual Calendars.