# How does Anki round?

Hey everyone,

how does Anki round?

I have several cards:
1.: (Interval: 8 days, Ease: 235%, Interval modifier: 80%, Lapses: 0). So the next Good interval thereby should be: 8 * 2,35 * 0,8 = 15,04, I get 15.
2.: (Interval: 2 days, Ease: 235%, Interval modifier: 80%, Lapses: 0). So the next Good interval thereby should be: 2 * 2,35 * 1 = 3,76, I get 4.
3.: (Interval: 9 days, Ease: 220%, Interval modifier: 80%, Lapses: 0). So the next Good interval thereby should be: 2 * 2,35 * 1 = 15,84, but here I get 15 and not 16. Can someone explain this?

Damien once wrote in an older post: “The old scheduler applies a 0-25% boost to learning steps to prevent them from appearing in a consistent order. The experimental scheduler reduces this boost to a few minutes, and doesn’t apply it at all if the card will be scheduled 1+ days in advance. This prevents cards from being scheduled an extra day due to that randomness.”.

But since I activated the 2.1 v, this should not cause any trouble.

Similar problem: I a lapsing card (Interval: 1 days, Ease: 210%, Interval modifier: 80%, Lapses: 2): 1 * 2,1 * 0,8 = 1.68. But for this card I get 3 day interval. Is it because of the laps. Do the laps interfere here?

I just want to know how Anki calculates the intervals in this

A post was merged into an existing topic: Intervals for Lapses