Anki assigns wrong interval

[mmdj2]

Deck Options Explained

if you think it’s too long to read, you can use example parts, they work as some sort of TL;DR. but if you’re new I recommend reading the whole thing.

Deck Options

I think deck options is the most important thing about anki that everybody should know how to work with and modify. Here I will explain things about deck options that I wish I had known when I started using anki and that are important for anki users to understand. it controls anki’s scheduler so if you use inappropriate settings, y…

When you press a button that say 30 days, anki might give the card a different interval. it’s due to fuzz factor and doesn’t mean anki’s algorithm is broken or it’s not functioning properly.
anki automatically applies a fuzz factor to all cards so when you introduce some new cards, you won’t have to review all of them in the same day.

The fuzz factor is usually between 15 to 20 percent.

Example

Here’s an example for you to understand fuzz factor better

Interval for card A: 10 days (on any button)
interval for card B: 20 days (on any button)
interval for card C: 30 days (on any button)
interval for card D: 40 days (on any button)

Now here’s the interval that we expect anki to give these cards:

for card A the interval should be something from 8 to 12 days
for card B the interval should be something from 16 to 24 days
for card C the interval should be something from 25 to 35 days
for card D the interval should be something from 34 to 46 days