In the pie chart it says 6 are passed. I guess those are related, and I guess they will show up tomorrow, meaning there should be 225 cards due tomorrow. Weâ€™ll see.

Do you have a particular problem youâ€™re trying to work out, or are you just checking Ankiâ€™s math? If thereâ€™s a problem, consider talking about that, and maybe someone can help.

There are a lots of factors that youâ€™re overlooking. Do any of these cards have more than 1 sibling? Do any of these cards have siblings that are being buried, but are not yet due themselves (today or tomorrow) or are suspended or are new?

I think if you want to check Ankiâ€™s math, youâ€™d at least need an apples-to-apples comparison, like (1) pre-study, how many cards show in the browser as being due today (or overdue) prop:due<=0, (2) post-study, how many cards were studied today that were not New rated:1 -introduced:1 and how many notes have cards that are buried is:buried (toggle to Notes).

I think weâ€™ve explained a few times some of the things Anki is/is not counting to come up with that number, and reasons why it can vary slightly from the actual number of cards you will study the next day.

If this variability is bothering you so much you cannot let it go â€“ youâ€™re still not going to be able to find the answer by looking at that one number on that one screen. If you want help putting together some search filters that will help you figure out exactly where that due number is coming from each day in your decks, just say so. Iâ€™m sure we can come up with something.

Here is a partial list of the things that I have noticed in the past 2 days that impact the number of cards due â€śtomorrowâ€ť â€“ which you can consider as either the count shown on the Future Due graph for â€śtomorrowâ€ť or the number of actual cards studied â€śtomorrowâ€ť â€“

Cards due tomorrow that are siblings of cards due/overdue (and studied) today â€“ before I study today, they are included in the count for tomorrow, but after I study they are buried and are not included in the count for tomorrow.

Cards due/overdue today that are buried today because I studied their siblings today â€“ before I study today, they are not included in the count for tomorrow (because they arenâ€™t due tomorrow), after I study they are buried, so still not included in the count for tomorrow. But nevertheless they will be unburied in the morning and overdue at that point, so they will be contenders to be studied tomorrow (even though they never appeared in the Future Due graph today).

Cards that are due/overdue today or tomorrow that belong to notes I have manually buried â€“ like #1 or #2, they may or may not have been included in the count for tomorrow before being buried, but after being buried, they are not included in the cout for tomorrow.

Cards due tomorrow that have siblings also due tomorrow â€“ both/all are included in the count for tomorrow, but only 1 of them will actually be studied tomorrow.

Cards introduced/reviewed today that are now set for their next review tomorrow â€“ before I study today, they are not included in the count for tomorrow, after I study they are included in the count.

Anki thinks about all these things so you donâ€™t have to â€“ but that also means it is impossible for Anki to guarantee you precisely how many cards you will study tomorrow.

If I wake up and it says 181 cards due, and I completed all previous reviews the previous day, then it shouldnâ€™t tell me the previous day that 180 cards will be due. That is a real example.

Yep, that is a real example of #1, #2, or #3 that I already explained. Or, a real example of several things acting together to +/- cards, that ends up with a net of +1.

When I was making my observations to make that list of possibilities for you, I built a little formula (this is a real example) â€“

Future Due graph shows 61 cards.
My estimate for tomorrow â€“
59 [the 61 original minus the 2 that were buried because I studied their siblings today]
- 2 [for siblings that are both due tomorrow]
+ 2 [due tomorrow but currently buried]
+ 4 [due/overdue today, and currently buried]
- 2 [of those that will be buried tomorrow, because they have siblings due/overdue tomorrow]
+ 2 [studied today and now due tomorrow, so they are counted in the graph]
+ 1 [from the manually buried note]
= 64 cards

So, you are welcome to do the math yourself and work out exactly how many cards will be due. Or you can just rely on Anki to show you the closest reasonable prediction of the future.