# FSRS **URL:** https://forums.ankiweb.net/c/anki/fsrs/19.md?page=2 [Latest](https://forums.ankiweb.net/latest.md) · [Categories](https://forums.ankiweb.net/categories.md) **Page:** 3 --- ## [Interval calculation higher then expected](https://forums.ankiweb.net/t/interval-calculation-higher-then-expected/68251)
**Author:** [@Jeanes](https://forums.ankiweb.net/u/Jeanes)\ **Replies:** 3\ **Last updated:** [January 18, 2026, 6:18am UTC](https://forums.ankiweb.net/t/interval-calculation-higher-then-expected/68251 "2026-01-18T06:18:43Z")
Hi all, i’ve been having issues with card interval calculations. Most of my cards get a calculated interval (after a review) that is higher (sometimes 2x) than the Stability of the card, but with a desired retention of… --- ## [Which level(s) are relevant to FSRSs for its retention time suggestions?](https://forums.ankiweb.net/t/which-level-s-are-relevant-to-fsrss-for-its-retention-time-suggestions/68302)
**Author:** [@Joachim](https://forums.ankiweb.net/u/Joachim)\ **Replies:** 7\ **Last updated:** [January 17, 2026, 7:47pm UTC](https://forums.ankiweb.net/t/which-level-s-are-relevant-to-fsrss-for-its-retention-time-suggestions/68302 "2026-01-17T19:47:53Z")
Is it the user response behaviour on the single-card level on the deck level on the preset level on the level of the note type on the collection level? --- ## [I'm failing more cards than I'm passing](https://forums.ankiweb.net/t/im-failing-more-cards-than-im-passing/68277)
**Author:** [@DragoN333](https://forums.ankiweb.net/u/DragoN333)\ **Replies:** 5\ **Last updated:** [January 15, 2026, 5:27pm UTC](https://forums.ankiweb.net/t/im-failing-more-cards-than-im-passing/68277 "2026-01-15T17:27:56Z")
Been using FSRS for as long as i have been using Anki, a month or 2 ago I switched to 80% (back then 90%) on FSRS so to lower my amount of daily reviews. Currently I’m only doing the japanese vocab Kaishi 1.5k. 2 weeks a… --- ## [Deleted cards still showing in 'Deck Life' and 'Collection' statistics - How to remove?](https://forums.ankiweb.net/t/deleted-cards-still-showing-in-deck-life-and-collection-statistics-how-to-remove/68219)
**Author:** [@lfmelchiades](https://forums.ankiweb.net/u/lfmelchiades)\ **Replies:** 2\ **Last updated:** [January 15, 2026, 1:32am UTC](https://forums.ankiweb.net/t/deleted-cards-still-showing-in-deck-life-and-collection-statistics-how-to-remove/68219 "2026-01-15T01:32:09Z")
I have a question that seems really stupid, but I’ve already searched and can’t figure out how to solve it. I recently deleted all the cards from my main deck and started fresh with Anki. However, in the statistics, when… --- ## [What determines when you can optimize?](https://forums.ankiweb.net/t/what-determines-when-you-can-optimize/68280)
**Author:** [@mason](https://forums.ankiweb.net/u/mason)\ **Replies:** 1\ **Last updated:** [January 15, 2026, 12:12am UTC](https://forums.ankiweb.net/t/what-determines-when-you-can-optimize/68280 "2026-01-15T00:12:58Z")
I swear hitting the optimize button used to almost always tell me that things were already optimal until I waited a long time for more data to build up. But now, I have a deck with over 10,000 reviews that is optimizable… --- ## [Intervals are different on IOS and PC](https://forums.ankiweb.net/t/intervals-are-different-on-ios-and-pc/68221)
**Author:** [@riprull](https://forums.ankiweb.net/u/riprull)\ **Replies:** 15\ **Last updated:** [January 14, 2026, 1:21am UTC](https://forums.ankiweb.net/t/intervals-are-different-on-ios-and-pc/68221 "2026-01-14T01:21:25Z")
Hello, so a couple days ago i bought ankimobile on IOS and i noticed that the intervals of time with the pc version are kind of different. On the pc version, when a new card seems easy, it would finally give it an interv… --- ## [Interval goes down without any parameter changes (i.e. no optimization)](https://forums.ankiweb.net/t/interval-goes-down-without-any-parameter-changes-i-e-no-optimization/67995)
**Author:** [@aps](https://forums.ankiweb.net/u/aps)\ **Replies:** 11\ **Last updated:** [January 9, 2026, 2:54pm UTC](https://forums.ankiweb.net/t/interval-goes-down-without-any-parameter-changes-i-e-no-optimization/67995 "2026-01-09T14:54:12Z")
I have noticed that, with no new cards in the deck, the number of reviews is not coming down. So, I have started to pay attention to the intervals and noticed that sometimes they go down even if I answer ‘good’. I unders… --- ## [Mismatch between projected forgetting curve, card interval, and stability?](https://forums.ankiweb.net/t/mismatch-between-projected-forgetting-curve-card-interval-and-stability/68193)
**Author:** [@wheat](https://forums.ankiweb.net/u/wheat)\ **Replies:** 3\ **Last updated:** [January 9, 2026, 2:37am UTC](https://forums.ankiweb.net/t/mismatch-between-projected-forgetting-curve-card-interval-and-stability/68193 "2026-01-09T02:37:51Z")
I recently switched to FSRS and let it reschedule my cards. I thought I understood what some of the terms mean, but after looking at this card’s stats below, I’m no longer certain. I set my desired retention to 85%. The… --- ## [When optimizing based on past reviews, does FSRS take into account what the desired retention setting was at the time of those reviews?](https://forums.ankiweb.net/t/when-optimizing-based-on-past-reviews-does-fsrs-take-into-account-what-the-desired-retention-setting-was-at-the-time-of-those-reviews/68171)
**Author:** [@yryrdz](https://forums.ankiweb.net/u/yryrdz)\ **Replies:** 2\ **Last updated:** [January 8, 2026, 4:43pm UTC](https://forums.ankiweb.net/t/when-optimizing-based-on-past-reviews-does-fsrs-take-into-account-what-the-desired-retention-setting-was-at-the-time-of-those-reviews/68171 "2026-01-08T16:43:41Z")
When using past reviews as a basis for future intervals, how does FSRS factor in what the desired minimal retention was at the time of those past reviews? For example, If I lower the minimum retention to say, seventy, d… --- ## [FSRS Simulator doesn't factor in "new cards/day" when simulating](https://forums.ankiweb.net/t/fsrs-simulator-doesnt-factor-in-new-cards-day-when-simulating/68173)
**Author:** [@snowsailor](https://forums.ankiweb.net/u/snowsailor)\ **Replies:** 3\ **Last updated:** [January 8, 2026, 3:16am UTC](https://forums.ankiweb.net/t/fsrs-simulator-doesnt-factor-in-new-cards-day-when-simulating/68173 "2026-01-08T03:16:56Z")
Running the latest version of Anki desktop MacOS: Version ⁨25.09.2 (3890e12c)⁩ Python 3.13.5 Qt 6.9.1 Chromium 122 I have a deck with ~3000 cards and if I add zero new cards then my typical day involves 30-40 reviews … --- ## [Very useful Addon](https://forums.ankiweb.net/t/very-useful-addon/68063)
**Author:** [@Bayad427](https://forums.ankiweb.net/u/Bayad427)\ **Replies:** 9\ **Last updated:** [January 5, 2026, 5:15pm UTC](https://forums.ankiweb.net/t/very-useful-addon/68063 "2026-01-05T17:15:05Z")
The Link : :gear:FSRS Smart-Pass​:brain: - AnkiWeb :backhand\_index\_pointing\_left: --- ## [Simulator -- line for each deck/subdeck](https://forums.ankiweb.net/t/simulator-line-for-each-deck-subdeck/68095)
**Author:** [@nsk](https://forums.ankiweb.net/u/nsk)\ **Replies:** 0\ **Last updated:** [January 5, 2026, 12:08am UTC](https://forums.ankiweb.net/t/simulator-line-for-each-deck-subdeck/68095 "2026-01-05T00:08:59Z")
In the simulator we get one line for all of the cards in a preset. I would like to see it broken down by deck (ideally down to the subdeck). Each deck could get its own color or linestyle. --- ## [Undesired FSRS behaviour after Optimizing](https://forums.ankiweb.net/t/undesired-fsrs-behaviour-after-optimizing/67971)
**Author:** [@Joachim](https://forums.ankiweb.net/u/Joachim)\ **Replies:** 12\ **Last updated:** [December 29, 2025, 11:16am UTC](https://forums.ankiweb.net/t/undesired-fsrs-behaviour-after-optimizing/67971 "2025-12-29T11:16:46Z")
I have a special deck for cards I do not remember well. In the preset of that deck, I set the desired retention to 95%, so these cards get enhanced training. What happened until just recently is that the interval of such… --- ## [Forgetting Curve seems incorrect](https://forums.ankiweb.net/t/forgetting-curve-seems-incorrect/67797)
**Author:** [@winnie\_13](https://forums.ankiweb.net/u/winnie_13)\ **Replies:** 2\ **Last updated:** [December 14, 2025, 9:38pm UTC](https://forums.ankiweb.net/t/forgetting-curve-seems-incorrect/67797 "2025-12-14T21:38:17Z")
I’m using Anki desktop and FSRS enabled. My forgetting curve seems incorrect. How I can influence it? Basically I’ve barely remebered this word. Like I’ve stared on it for 5 second. Realized that I can remeber engl… --- ## [FSRS very uneven difficulty](https://forums.ankiweb.net/t/fsrs-very-uneven-difficulty/67482)
**Author:** [@Ooglogput](https://forums.ankiweb.net/u/Ooglogput)\ **Replies:** 8\ **Last updated:** [December 5, 2025, 8:53pm UTC](https://forums.ankiweb.net/t/fsrs-very-uneven-difficulty/67482 "2025-12-05T20:53:02Z")
After switching to FSRS a few months ago, I noticed the card difficulties seem way off: I spot checked some ~100% cards, and there are cards there where I have only ever pressed Good or Easy, so I really don’t think … --- ## [Health check bad fit recommendations wrongly assume cards are too hard, not too easy](https://forums.ankiweb.net/t/health-check-bad-fit-recommendations-wrongly-assume-cards-are-too-hard-not-too-easy/67666)
**Author:** [@Rwmpelstilzchen](https://forums.ankiweb.net/u/Rwmpelstilzchen)\ **Replies:** 0\ **Last updated:** [December 3, 2025, 1:53am UTC](https://forums.ankiweb.net/t/health-check-bad-fit-recommendations-wrongly-assume-cards-are-too-hard-not-too-easy/67666 "2025-12-03T01:53:33Z")
deck-config-fsrs-bad-fit-warning is defined as such: deck-config-fsrs-bad-fit-warning = Health Check: Your memory is difficult for FSRS to predict. Recommendations: - Suspend or reformulate any cards you consta… --- ## [Simulator predicts a huge increase in workload – is this reversable?](https://forums.ankiweb.net/t/simulator-predicts-a-huge-increase-in-workload-is-this-reversable/67335)
**Author:** [@yryrdz](https://forums.ankiweb.net/u/yryrdz)\ **Replies:** 7\ **Last updated:** [November 16, 2025, 1:58am UTC](https://forums.ankiweb.net/t/simulator-predicts-a-huge-increase-in-workload-is-this-reversable/67335 "2025-11-16T01:58:37Z")
So thanks to advice I had received here I made a series of changes to how I anki’d. That thread is here. But to summarize it, I fiddled with my learning and relearning steps, going from 10m to 40m to 3 hours. I also real… --- ## [Help! I messed up my decks with optimization](https://forums.ankiweb.net/t/help-i-messed-up-my-decks-with-optimization/67158)
**Author:** [@bigankiuser](https://forums.ankiweb.net/u/bigankiuser)\ **Replies:** 3\ **Last updated:** [October 30, 2025, 6:57am UTC](https://forums.ankiweb.net/t/help-i-messed-up-my-decks-with-optimization/67158 "2025-10-30T06:57:03Z")
Long time Anki user with over 30K cards in mature and learning. I had presets adjusted for my own needs based on some suggestions online. I changes to FSRS and optimized all presets. Yeah, I didn’t know what I was/am doi… --- ## [I'm forgetting cards which have long intervals](https://forums.ankiweb.net/t/im-forgetting-cards-which-have-long-intervals/67212)
**Author:** [@mandarin7345](https://forums.ankiweb.net/u/mandarin7345)\ **Replies:** 2\ **Last updated:** [October 28, 2025, 6:15pm UTC](https://forums.ankiweb.net/t/im-forgetting-cards-which-have-long-intervals/67212 "2025-10-28T18:15:34Z")
I’ve been using Anki for about two months to study Mandarin. My apologies if this is the incorrect forum for this question. I have cards with review dates far in the future, however I’ve forgotten the cards. My guess … --- ## [Request: Option for deck specific DR to apply subdecks](https://forums.ankiweb.net/t/request-option-for-deck-specific-dr-to-apply-subdecks/67215)
**Author:** [@tm955](https://forums.ankiweb.net/u/tm955)\ **Replies:** 3\ **Last updated:** [October 28, 2025, 1:17pm UTC](https://forums.ankiweb.net/t/request-option-for-deck-specific-dr-to-apply-subdecks/67215 "2025-10-28T13:17:45Z")
Is your feature request related to a problem? Please describe. Recently, the ability to select a desired retention based on deck was added. This is a handy feature, but based on the poll results in this discussion, it w… --- ## [FSRS gives very long initial intervals after long period without new cards](https://forums.ankiweb.net/t/fsrs-gives-very-long-initial-intervals-after-long-period-without-new-cards/67199)
**Author:** [@zZH2z](https://forums.ankiweb.net/u/zZH2z)\ **Replies:** 1\ **Last updated:** [October 27, 2025, 8:42am UTC](https://forums.ankiweb.net/t/fsrs-gives-very-long-initial-intervals-after-long-period-without-new-cards/67199 "2025-10-27T08:42:34Z")
I have a deck that uses its own FSRS settings (not shared with other decks). This deck is special — I learned part of the material a long time ago, and for a long time I intentionally didn’t add any new cards. I keep r… --- ## [FSRS Intervals are so high](https://forums.ankiweb.net/t/fsrs-intervals-are-so-high/67113)
**Author:** [@muad15](https://forums.ankiweb.net/u/muad15)\ **Replies:** 2\ **Last updated:** [October 26, 2025, 5:06pm UTC](https://forums.ankiweb.net/t/fsrs-intervals-are-so-high/67113 "2025-10-26T17:06:29Z")
At first my anki intervals were normal and the interval spacing was nice but suddenly my intervals have been so high recently. My FSRS is set to 90% and my true retention is around 85%, but this was in account to my old … --- ## [FSRS simulator underestimates the number of cards memorized](https://forums.ankiweb.net/t/fsrs-simulator-underestimates-the-number-of-cards-memorized/67162)
**Author:** [@ZornHadNoChoice](https://forums.ankiweb.net/u/ZornHadNoChoice)\ **Replies:** 3\ **Last updated:** [October 25, 2025, 5:14pm UTC](https://forums.ankiweb.net/t/fsrs-simulator-underestimates-the-number-of-cards-memorized/67162 "2025-10-25T17:14:58Z")
The FSRS simulator seems to fail at calculating the number of cards memorized with large decks. Steps to reproduce Generate a deck of 6000 basic notes. Make a default preset for that deck (with the exception of 9999 re… --- ## [Never reviewed unsuspended cards starting with different intervals](https://forums.ankiweb.net/t/never-reviewed-unsuspended-cards-starting-with-different-intervals/67143)
**Author:** [@NickZazz](https://forums.ankiweb.net/u/NickZazz)\ **Replies:** 1\ **Last updated:** [October 23, 2025, 10:44pm UTC](https://forums.ankiweb.net/t/never-reviewed-unsuspended-cards-starting-with-different-intervals/67143 "2025-10-23T22:44:26Z")
Hello everyone, a few of my classmates have mentioned this problem and so im curious if anyone knows the cause. A friend of mine who has been using the same parameters for a while now (and has previously rescheduled wit… --- ## [I changed the way I grade my cards. Should I defer optimization to give FSRS more data first?](https://forums.ankiweb.net/t/i-changed-the-way-i-grade-my-cards-should-i-defer-optimization-to-give-fsrs-more-data-first/67036)
**Author:** [@Anon\_0000](https://forums.ankiweb.net/u/Anon_0000)\ **Replies:** 6\ **Last updated:** [October 22, 2025, 6:57am UTC](https://forums.ankiweb.net/t/i-changed-the-way-i-grade-my-cards-should-i-defer-optimization-to-give-fsrs-more-data-first/67036 "2025-10-22T06:57:25Z")
Backstory I have always used 3 buttons only (all except for “easy”). Now, I want to push cards further into the future if they are ridiculously easy. In the past, I had graded those cards as “good”. But now, I started to… --- ## [If you would like automatic optimization of FSRS parameters, please submit a response](https://forums.ankiweb.net/t/if-you-would-like-automatic-optimization-of-fsrs-parameters-please-submit-a-response/67009)
**Author:** [@Expertium](https://forums.ankiweb.net/u/Expertium)\ **Replies:** 9\ **Last updated:** [October 17, 2025, 3:20pm UTC](https://forums.ankiweb.net/t/if-you-would-like-automatic-optimization-of-fsrs-parameters-please-submit-a-response/67009 "2025-10-17T15:20:49Z")
Typically, I do anonymous surveys. In this one, if you answer “Yes” to the first question, you will be asked to submit your Reddit/Anki forums/Discord/Github username. What I’m trying to achieve is to make it clear to… --- ## [Has anyone done a live comparison of FSRS and SM2 as implemented in Anki? (It looks like no, so can anyone help me set it up?)](https://forums.ankiweb.net/t/has-anyone-done-a-live-comparison-of-fsrs-and-sm2-as-implemented-in-anki-it-looks-like-no-so-can-anyone-help-me-set-it-up/34996)
**Author:** [@nymvaline](https://forums.ankiweb.net/u/nymvaline)\ **Replies:** 12\ **Last updated:** [October 17, 2025, 3:03pm UTC](https://forums.ankiweb.net/t/has-anyone-done-a-live-comparison-of-fsrs-and-sm2-as-implemented-in-anki-it-looks-like-no-so-can-anyone-help-me-set-it-up/34996 "2025-10-17T15:03:41Z")
With the new version coming out soon, and FSRS being supported natively, I wanted to see if anyone had results about the difference. Has anyone randomly divided their cards and had half running on FSRS and half on the de… --- ## [Flag wise retention similar to deck wise retention](https://forums.ankiweb.net/t/flag-wise-retention-similar-to-deck-wise-retention/66966)
**Author:** [@Raskolnikov](https://forums.ankiweb.net/u/Raskolnikov)\ **Replies:** 9\ **Last updated:** [October 13, 2025, 12:44am UTC](https://forums.ankiweb.net/t/flag-wise-retention-similar-to-deck-wise-retention/66966 "2025-10-13T00:44:43Z")
so we can preferentially read and nail cards which are more important and difficult dispersed among diff decks --- ## ["Smooth graph" doesn't do anything](https://forums.ankiweb.net/t/smooth-graph-doesnt-do-anything/66892)
**Author:** [@Expertium](https://forums.ankiweb.net/u/Expertium)\ **Replies:** 5\ **Last updated:** [October 6, 2025, 9:40am UTC](https://forums.ankiweb.net/t/smooth-graph-doesnt-do-anything/66892 "2025-10-06T09:40:30Z")
Steps to reproduce: Go to deck options → FSRS simulator. In the simulator window, toggle “Smooth graph” off. Click Simulate. Toggle “Smooth graph” on. Click Simulate. Behold…nothing has changed. The two… --- ## [Inconsistent Anki affecting FSRS parameters](https://forums.ankiweb.net/t/inconsistent-anki-affecting-fsrs-parameters/66784)
**Author:** [@JohnG1](https://forums.ankiweb.net/u/JohnG1)\ **Replies:** 1\ **Last updated:** [October 1, 2025, 8:56pm UTC](https://forums.ankiweb.net/t/inconsistent-anki-affecting-fsrs-parameters/66784 "2025-10-01T20:56:54Z")
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