Menstruation and postnatal bleeding are not made up for prayer. All four schools agree on this. Fasting is the opposite case — missed fasts of Ramadan are made up, missed prayers are not. People get this backwards often, so enter those days as an exempt period below and they will be subtracted.
Witr: the Hanafi school holds Witr to be wajib, so it is owed and made up. The majority of scholars hold it to be a confirmed sunnah, which most do not treat as a qaza debt. Set the Witr switch to match what you follow — this page does not decide between the two.
Order (tartib): some scholars, particularly in the Hanafi school, hold that missed prayers should be made up in the order they were missed. That requirement is commonly said to lapse once six or more prayers are owed, or when the time for the current prayer is running short — so someone with years of missed prayers is usually not bound by it. The Shafi‘i and Hanbali positions generally treat the order as recommended rather than binding when the number is large.
Prayers left deliberately: the majority of scholars hold that they must still be made up, alongside sincere repentance. A minority — notably Ibn Hazm and Ibn Taymiyyah — held that a prayer deliberately left until its time ran out cannot be made up at all, and that what is owed instead is repentance and an abundance of voluntary prayer. This tool takes no side; it only counts.
If your case is unusual — a long illness, a period of unconsciousness, coming to Islam later in life, or real uncertainty about when you reached puberty — ask a qualified scholar. Nothing on this page is a fatwa.