Get a ready-made list of upcoming Mondays and Thursdays — the two weekdays the Prophet Muhammad (peace be upon him) fasted most often — to plan your voluntary fasting.
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Fasting every Monday and Thursday is one of the best-documented voluntary practices attributed to the Prophet Muhammad (peace be upon him), recorded in hadith collections such as Sunan al-Tirmidhi and Sunan Ibn Majah. When asked why he fasted specifically on these two days, he explained that deeds are presented to Allah on Mondays and Thursdays, and he loved to be in a state of fasting when his deeds were presented. A separate, widely cited hadith also links Monday specifically to his own birth and to the beginning of his prophethood, adding another layer of significance to that day. Like the White Days, this fast is entirely voluntary (Sunnah), not obligatory, and a person may fast one of the two days, both, or neither in any given week without any sin. This calculator simply turns the weekly pattern into a concrete, dated list on the ordinary Gregorian calendar most people already use for scheduling, making it easier to plan meals, work commitments, and family life around a regular fasting habit.
Alongside the White Days, fasting on Mondays and Thursdays is one of the most consistently practiced voluntary fasts in the Islamic tradition, and one of the easiest to build into a weekly routine because it follows the familiar seven-day week rather than the shifting Hijri calendar. Multiple hadiths, including narrations found in Sunan al-Tirmidhi and Sunan Ibn Majah, describe the Prophet Muhammad (peace be upon him) explaining his own reason for choosing these two days: deeds are presented before Allah on Mondays and Thursdays, and he wished to be in a state of fasting at that moment. A separate tradition also connects Monday to two other meaningful events in his life — his birth and the beginning of his prophethood — giving the day an additional layer of significance beyond the weekly deed-presentation hadith.
Because this fast is voluntary rather than obligatory, there is no fixed requirement to fast both days every single week. Some weeks a person might only manage Monday, other weeks only Thursday, and some weeks neither — none of this carries any sin, since the reward is for the extra effort made, not a punishment for what is skipped. What tends to make the habit stick, in practice, is having a clear, dated schedule to follow rather than trying to remember "is today Monday or Thursday?" each morning.
That is exactly the gap this calculator fills. Instead of mentally tracking the weekly cycle, you get a ready list of upcoming Mondays and Thursdays over whatever time horizon suits your planning style — two weeks for a short-term commitment, or up to twelve weeks for those who like to plan meals and work schedules well in advance. The list also carries a practical reminder: on the rare occasion a Monday or Thursday coincides with Eid al-Fitr, Eid al-Adha, or one of the three days of Tashreeq immediately following Eid al-Adha, fasting is not permitted that day for anyone, voluntary or otherwise, so that particular date should simply be skipped.
Whether you're starting this Sunnah for the first time or have practiced it for years, having the actual calendar dates in front of you — rather than relying on memory — makes it noticeably easier to stay consistent week after week.
Hadiths report that he explained deeds are presented to Allah on these two days, and he preferred to be fasting when that happened. Monday is also linked in some hadiths to his birth and the start of his prophethood.
No, it is a voluntary (Sunnah) fast. You are free to fast one day, both days, or skip a week entirely without any sin.
Skip fasting on Eid al-Fitr, Eid al-Adha, or the three days of Tashreeq, since fasting is prohibited on those specific days for everyone, and simply resume the following week.
Yes. Many people fast both patterns together whenever a Monday or Thursday happens to also fall on the 13th, 14th, or 15th of the Hijri month, since the two Sunnahs are not mutually exclusive.
No, this is a static planning list. Bookmark this page or copy the dates into your own calendar app to set personal reminders.