# Anki assigns wrong interval

**URL:** <https://forums.ankiweb.net/t/anki-assigns-wrong-interval/735>\
**Category:** Help\
**Created:** [July 4, 2020, 2:54pm UTC](https://forums.ankiweb.net/t/anki-assigns-wrong-interval/735 "2020-07-04T14:54:50Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![AJX](https://avatars.discourse-cdn.com/v4/letter/a/9f8e36/32.png) [@AJX](https://forums.ankiweb.net/u/AJX)\
**Post date:** [July 4, 2020, 2:54pm UTC](https://forums.ankiweb.net/t/anki-assigns-wrong-interval/735/1 "2020-07-04T14:54:50Z")

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I set my new cards both Easy and Graduating Interval to 3 days. I also have set lapses minimum interval to 3 days. However, for new cards after clicking easy which is supposed to have 3 days interval, Anki assigns varying intervals from 2 to 4 days. The same problem applies to review card that have lapsed. I am not sure if this is a bug or I am doing something wrongly? I am on Anki 2.1.26. Attached is an example of a new card which is supposed to have 3 day interval after clicking easy but Anki assigns 2 days instead.

 ![image](https://us1.discourse-cdn.com/flex002/uploads/anki2/original/1X/e5e5d02af73366667a865562544a9503d34f5612.png)

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**Author:** ![mmdj2](https://sea2.discourse-cdn.com/flex002/user_avatar/forums.ankiweb.net/mmdj2/32/124_2.png) [@mmdj2](https://forums.ankiweb.net/u/mmdj2)\
**Post date:** [July 4, 2020, 3:18pm UTC](https://forums.ankiweb.net/t/anki-assigns-wrong-interval/735/2 "2020-07-04T15:18:13Z")

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> [@Deck Options Explained](https://forums.ankiweb.net/t/deck-options-explained/213):
>
> 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**

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**Author:** ![system](https://us1.discourse-cdn.com/flex002/uploads/anki2/original/1X/8f1279ababc5879d54e4838989f606cfe55af8c7.jpeg) [@system](https://forums.ankiweb.net/u/system)\
**Post date:** [May 1, 2023, 5:41am UTC](https://forums.ankiweb.net/t/anki-assigns-wrong-interval/735/3 "2023-05-01T05:41:40Z")

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