Issues with incorrect interval on review cards


My Ease Bonus = 250% and my Interval Modifier = 1.2 (see screen shots for settings and card examples). I just did 2 reviews today and checked both cards to see what interval Anki set. Neither was what I expected (again, see screen shots for the examples.)

Both cards have an ease of 250%. Card 1 had a previous interval of 7 days and card 2 had a previous interval of 4 days. I answered Good on both, so I would expect a new interval of 21 days and 12 days, respectively (previous interval * 2.5 * 1.2). Instead, I got 23 days and 10 days, respectively.

Am I understanding the algorithm wrong or something else messed up with my options?

Thanks in advance!

There is a fuzz factor if I’m not mistaken. So no you’re good. This is expected behavior.


More info: Studying - Anki Manual

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