Calculate how many missed Ramadan fasting days (Qada) you still owe and build a simple weekly plan to finish them before next Ramadan.
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Islam obligates every Muslim who breaks a fast during Ramadan for a valid Shari'a reason — illness, travel, menstruation, pregnancy, breastfeeding, or similar hardship — to make up (Qada) that missed day later, on any other day of the year outside Ramadan itself and the days fasting is forbidden (the two Eid days and the three days of Tashreeq). This obligation is drawn directly from the Qur'an (2:184-185), which instructs the traveler or the sick to fast an equal number of days at another time. The mainstream position among the four Sunni schools of jurisprudence holds that missed days do not need to be made up consecutively or in the same order they were missed, and that the obligation should ideally be completed before the next Ramadan arrives. Scholars differ on the exact consequence of an unjustified delay past that point — some recommend sincere repentance alone, others add a Fidyah payment — so anyone significantly behind on Qada is encouraged to consult a qualified scholar. For those permanently unable to fast due to old age or chronic illness, Fidyah (feeding a poor person for each missed day) is the accepted substitute.
Every Ramadan, many Muslims break their fast on one or more days for reasons the Shari'a explicitly excuses — illness that fasting would worsen, a long journey, menstruation, pregnancy, or breastfeeding, among others. What follows that missed day is not guilt but a clear, practical instruction from the Qur'an itself: fast the same number of days at another time (Qur'an 2:184-185). This replacement fast is known as Qada al-Sawm, and unlike Ramadan itself, it can be performed on almost any day of the year.
The biggest source of confusion is not whether Qada is required — that part is settled and agreed upon — but how to plan for it. Missed days pile up quickly for anyone dealing with chronic illness, a difficult pregnancy, or frequent travel, and by the time the next Ramadan approaches, it's easy to lose track of exactly how many days are still owed. A simple Qada calculator solves this by turning a vague sense of "I think I still owe a few days" into a concrete number and a realistic weekly plan.
The good news, agreed upon by the four major Sunni schools of jurisprudence, is that Qada days offer real flexibility. They do not need to be fasted consecutively, and they do not need to be completed in the same order the original days were missed. You can fast one day this week, skip the next, and pick up again whenever suits your schedule and health — as long as every owed day is eventually completed. The only fixed restriction is timing at the other end of the calendar: Qada fasting is never permitted on the two days of Eid al-Fitr and Eid al-Adha, or on the three days of Tashreeq immediately following Eid al-Adha, since fasting itself is forbidden on those five days for every Muslim.
Most scholars encourage finishing all Qada days before the next Ramadan begins, treating each Ramadan as a kind of natural deadline. Opinions vary on what happens if that deadline passes without a valid excuse — some scholars call for sincere repentance alone, while others add a Fidyah payment for the delay — which is exactly the kind of borderline case worth raising with a knowledgeable local scholar rather than guessing.
For anyone whose illness or age makes fasting permanently impossible, Islamic law does not leave them without an option: paying Fidyah, generally understood as feeding one poor person for each day that cannot be fasted, is the accepted substitute. Whichever situation applies to you, turning your remaining Ramadan debt into a clear number of days and a weekly pace — rather than an open-ended worry — makes it far easier to actually finish.
Qada al-Sawm is the obligation to fast one day at any later time, outside Ramadan, to replace a Ramadan day you broke or missed for a valid Shari'a reason such as illness, travel, or menstruation.
No. The mainstream position across the four Sunni schools is that Qada days can be fasted on separate, non-consecutive days, in whatever order is practical for you, as long as they are all eventually completed.
Most scholars hold that Qada should ideally be finished before the next Ramadan begins. If you are significantly behind, it is best to consult a qualified scholar about your specific situation.
In that case, the mainstream ruling allows paying Fidyah — typically feeding a poor person — for each day you are permanently unable to make up, instead of fasting.
You cannot fast Qada on the two days of Eid (Eid al-Fitr and Eid al-Adha) or the three days of Tashreeq following Eid al-Adha, since fasting is prohibited on those days for everyone.