Frequently Asked Questions
MikvahCalendar.com is the original, rabbinically approved Mikvah Calendar app designed to help women and couples observe taharat hamishpacha with halachic accuracy, privacy, and ease. It calculates mikvah dates, zmanim, ovulation estimates, and more — customized to your personal minhag.
The app automatically calculates mikvah night, Hefsek Taharah, Onot Perishah, and ovulation windows based on your cycle and halachic custom — including Ashkenazic, Sephardic, Chabad, Satmar, Belz, Skver, Ger, and Bucharian traditions.
Yes. MikvahCalendar.com offers a Mehadrin phone-based system for users who prefer not to use internet-connected devices. You can receive mikvah reminders via phone call in your time zone, with no internet required. The numbers for the Mehadrin Mikvah Calendar are: US and Canada +1-347-270-8434, Israel +972-2-376-3312, UK +44-770-014-6262
Yes. Mikvah Calendar is rabbinically approved and widely recommended by rabbis, kallah teachers, rebbetzins, and halachic advisors around the world. We have been live since 2009 and have proven correctness and accuracy.
Absolutely. The app supports all major minhagim including Ashkenazi, Sephardi, Chassidic (Chabad, Satmar, Belz, Skver, Ger), and Bucharian customs — ensuring halachic accuracy specific to your tradition.
Yes. You will need to change your location in Settings<Location. After that, MikvahCalendar.com adjusts zmanim automatically based on your location and time zone. You can use MikvahCalendar.com in English, Hebrew, Spanish, French, or Russian.
Mikvah Calendar is free to try for 3 weeks. After that, a membership is available from just $27/year. Free grants are available as gifts in our circle of kindness grant box.
You’ll receive discreet reminders for hefsek taharah, sheva nikiim, mikvah night, ovulation, onos (anticipated flows), and optional women’s health — via email, text, WhatsApp (in certain countries), or phone call.
The app is used by kallahs, newlyweds, long-time married women, rebbetzins, and kallah teachers — anyone seeking halachic clarity and support in maintaining taharat hamishpacha.
Definitely! MikvahCalendar.com will calculate all of your mikvah dates correctly regardless of the frequency of your periods.
When you enter a new flow immediately following your birth/miscarraige, you are able to indicate a birth by checking the box, “A birth has occurred since my last flow.” MikvahCalendar.com will use this information to ensure proper calculations of anticipated flows.
If you are currently not in a Niddah state, the four or five minimum day waiting period before performing the Hefsek Tahara is necessary even when the cause of Niddah is spotting. If you are currently in the 7 White days, no waiting is required. In this case, you can make your Hefsek Taharah immediately.
No. If you have already been in niddah for 5 days (for example your flow starts during your 7 White Days), you can try and perform a Hefsek Tahara as soon as possible. MikvahCalendar.com automatically calculates your earliest Hefsek Tahara date using this information.
Your calendar page contains a central pink instruction box. After you have entered your “start of flow”, you will see a button appear in this pink box which says, “To enter an earlier Hefsek, click here”. You can click on this button and your minimum wait time will be removed.
You can always record your niddah dates at a later time as long as all dates are entered in chronological order. (Although you should make every effort to record them on time so as to be aware of upcoming important dates.)
Click the “X” in the upper right corner of the date to delete the most recent flow or hefsek. You may then enter the correct date and time.
You would still continue to use mikvahcalendar.com as normal. If you have any concerns, you should speak to your Rav.
If you travel across the International Date Line, you should ask a Rabbi to find out how that might affect your important dates.
Your information is automatically saved every time you enter new information!
Rabbi Fishel Jacobs would be happy to answer your questions. He displays extreme sensitivity and patience in all cases. He can be reached at rabbijacobs@mikvahcalendar.com. Everything is completely confidential.
Yoetzot.org has a confidential hotline staffed by women who are experts in the laws pertaining to Family Purity.
You can access their number at:Â http://www.yoatzot.org/hotline.php. You can also email them at:Â http://www.yoatzot.org/ask.php.
Machon Puah is an organization which provides counseling, referrals and support, free-of-charge, to all those seeking professional help for infertility. Puah has a confidential Taharat Hamishpacha hotline to aid couples that need immediate answers.  Machon Puah’s phone number is: 805-391-7824 or 02.651.5050. You can also email them at: hotline@puahfertility.org.
And of course, you can always call your community Rabbi or Rebbetzin.
Just wait for your important dates and times to be emailed and/or texted to you!
Most women ovulate 14 days before they get their next period. The calculation shown on your calendar will be more accurate for women with regular periods. Most OBGYNs recommend using a calendar in conjunction with other tests for ovulation to women trying to calculate the actual day of ovulation. For exact ovulation date, an ultrasound and blood test is required. We have calculated your estimated ovulation if your periods are at least 18 days apart.
If you do not see your data after logging in, it is likely that you logged in using a different email address or phone number than the one linked to your membership. We are happy to help you resolve this.
To find the correct contact information associated with your account, check which email address or phone number is receiving your reminders. Then, simply log out and log back in using that contact info to access your active account.
Please be advised that MikvahCalendar.com tracks the basic vestos and typical Kavuah patterns. Some women may develop other complex and atypical patterns in their cycle. These patterns may not be tracked by the app. If you suspect you have an atypical pattern or are on hormonal contraceptives and want further guidance, please speak to a Rav familiar with these laws.–
You can view your Mikvah Calendar with the Hebrew calendar as primary or with the Gregorian calendar as primary.
You can switch this in Settings<Reminders or at the top of your calendar page.