You missed a day. Then a weekend. Maybe exam week ate you alive. Now Anki says you have 1,800 reviews due and you are doing the math on how many hours that takes, and it is ruining your morning.
Here is what you should not do first: nothing is broken. The backlog is the normal price of a missed week, not proof you failed the system. Spaced repetition schedules cards for the long run, and a delayed review still strengthens the memory. The Anki manual says it outright: if you are returning after a long break, you do not have to start anew. Just start back where you left off.
The goal is a boring, mechanical catch-up plan. Here is one.
Rule Zero: Do Not Reset Your Deck
When the backlog looks bad, the nuclear option looks tempting: select everything, reset progress, and start over. The Anki manual explicitly advises against this. It calls it the worst possible thing you can do, and the reasoning is simple. You still remember most of those cards. You would throw away months of scheduling history just to avoid an ugly number on the deck list.
If a card in the pile is easy, press Easy. That is what the button is for. Resetting everything converts mature cards you mostly know into brand-new cards, which is the exact opposite of what you need.
Rule One: Stop Adding New Cards
This is the first move in every backlog recovery. While you are catching up, set your new cards per day to zero. Every new card you learn today creates reviews tomorrow, next week, and next month, which makes the pile grow while you are trying to shrink it.
A reasonable estimate: each new card generates roughly 7 to 10 reviews over the following month. Adding 30 new cards a day while carrying a backlog means adding 200 to 300 reviews on top of what you owe. Pause new cards, catch up, then reintroduce them.
Understand What Anki Does on Its Own
When you fall behind, Anki prioritizes the cards that have been waiting the longest. It takes the cards that have been overdue the longest and shows those first, up to your daily limit. That means no card sits at the bottom of the pile forever.
It also factors the delay into the scheduling. When you finally answer a card that is two weeks overdue, Anki accounts for the extra interval when it decides the next one. This is why a missed week is not wasted: cards you answer correctly after a long delay get longer next intervals, which is good scheduling, not damage.
Method 1: The Catch-Up Math
Pick a number of days you want to be caught up by. A week to ten days is realistic for most backlogs.
Open your statistics page and find two numbers: how many reviews are currently due, and how many cards will become due during your catch-up window. Add them together, then divide by the number of days. That is your daily target: the number of reviews to do each day to clear the pile and stay current.
One refinement from students who have done this: divide by your retention rate, not by one. If you remember 85% of reviews on the first pass, the other 15% will lapse and come back for same-day re-review, so they cost you time too. A backlog of 1,500 reviews at 85% retention is really about 1,760 reviews of work. Spread over 10 days, that is roughly 176 reviews a day, plus whatever new reviews arrive daily.
A worked example: say you owe 1,400 reviews today, your stats page shows about 180 reviews become due each day, and your retention is around 85%. For a 10-day catch-up, the total work is 1,400 plus 10 days of 180 new reviews, which is 3,200 cards, divided by 0.85 for the lapses, roughly 3,760 reviews. Per day that is 376 reviews. That number tells you something honest: ten days at nearly 400 reviews a day is about 70 to 90 minutes of Anki, and if that is not survivable, stretch it to two weeks instead of failing at one.
That is the whole plan. It looks unglamorous because it is unglamorous.
Method 2: The Two-Filtered-Deck Trick
This method comes from the Anki manual's section on catching up, and it is the cleanest way to keep studying normally while the backlog sits off to the side.
Build two filtered decks:
- Just Due: filter
is:due prop:due>-7. These are cards that became due within the last week. Study this deck every day. This is your normal studying life, and it keeps the current queue from growing. - Over Due: filter
is:due prop:due<=-7. This is your backlog. Work through it like a batch of new cards, a fixed chunk per day, whenever you have extra time.
Because overdue cards return to the regular deck after you study them, the Over Due pile only shrinks as long as you keep the Just Due deck under control. One user reported clearing an 800-card backlog this way without changing anything else about their routine.
To build a filtered deck: click the deck, choose Custom Study at the bottom of the screen, then Build with a custom filter. You can delete or rebuild the filtered deck whenever you want. Deleting it does not delete the cards.
A few details that make this work better in practice:
- Rebuild the Just Due deck daily. It is a snapshot, not a live view. Rebuild it each morning so it keeps catching cards that became due overnight.
- Cap the Over Due deck. Give the Over Due filtered deck a card limit that matches your daily catch-up chunk, like 100 or 150 cards. That way you see a finishable session, not the whole mountain.
- Cards return where they belong. Studying a card in a filtered deck does not move it permanently. Cards answered correctly go back to the original deck with updated scheduling. The Over Due count shrinks, and nothing gets lost.
Method 3: Reschedule the Backlog With Set Due Date
If the raw number on the deck list is what stresses you out, you can redistribute it. In the browser, select your due cards, then go to Cards and choose Set Due Date. Entering a range like 7-28 spreads those cards evenly across the next 7 to 28 days. The pile becomes a manageable daily load, and you study it on a fixed schedule instead of staring at a giant number.
This is the fastest way to make the problem feel solvable. Use it when the backlog is large enough that the number itself is the reason you keep skipping sessions.
Method 4: Triage by Subject When an Exam Is Close
If a shelf exam or block exam is coming up, not all overdue cards are equally important. Use the browser to filter by tag and build a filtered deck of just the due cards for the relevant subject, for example deck:Pathology is:due or tag:#NBME::Medicine is:due.
Work the high-priority pile first. It is the studying equivalent of treating the sickest patient first. The rest of the backlog will still be there after the exam, but it will not be on fire anymore.
One guardrail: keep at least some daily flow through the other subjects while you triage, even if it is just the Just Due deck from Method 2. Suspending everything except one subject feels productive for two weeks and then hands you a second backlog.
A Note on the Postpone Add-On
You will find students recommending the Postpone Cards add-on, which pushes due dates forward in bulk. It works, but it only runs on the desktop version of Anki, and it is a blunt instrument: it shifts everything, including cards you actually know, which wastes the scheduling data you have already built. Try the methods above before installing anything. They use features Anki ships with and they do not touch cards you do not need to touch.
Settings to Change While You Catch Up
Set a daily review limit. In deck options, "Maximum reviews/day" caps how many reviews Anki shows. While catching up, set it to whatever your catch-up math produced. Once the backlog is gone, most medical students land somewhere between 150 and 300 as a sustainable daily ceiling.
Fix your lapse new interval. If you are still on the default lapse settings, Anki resets a lapsed card to a very short interval, which creates repeated short-term reviews that inflate your load. Students on the forums commonly raise the "new interval" for lapses from the default to around 40 to 50% of the old interval. You will see lapsed cards sooner than perfect scheduling would suggest, but your daily load stays sane and your recall barely changes.
Watch your Again rate. If you are pressing Again on more than about 15% of reviews, the backlog will regenerate itself. That usually means the cards are bad, not that your memory is bad. Ambiguous, over-long, or multi-concept cards create false Again presses. While catching up, suspend or delete the worst offenders without mercy. Every bad card you cut is future reviews you never have to do.
A Note on FSRS and Long Breaks
If you use the FSRS scheduler, a long break will not corrupt your parameters. The FSRS documentation says overdue reviews do not skew the optimizer as long as you answer honestly. Answer Again for what you truly forgot, even if the card is three weeks overdue. The optimizer treats honest failures as information, not as damage.
What Not to Do
- Do not do a single 2,000-card marathon session. Reviewing cards takes most experienced users 8 to 15 seconds each. Two thousand cards is five to eight hours of pure recall with no breaks. You will burn out and quit, which is how the backlog became a backlog in the first place.
- Do not suspend everything and "restart later." Suspended cards have no schedule. They sit in your deck as guilt and you never look at them again. Triage subjects by exam priority instead: suspend nothing, but study what matters first.
- Do not keep your new card count unchanged. See Rule One.
Once You Are Caught Up
Backlogs are usually caused by one of three things: too many new cards per day, an Again rate above 15%, or an unsustainable daily ceiling. Fix whichever one applies to you before you relax, or you will be back here in a month.
The cheapest insurance is a daily review cap and a consistent session time. Doing 200 cards at 7 AM every day beats doing 500 cards whenever you feel like it. Spaced repetition rewards consistency on a timescale of months, and the students still using Anki in fourth year are the ones whose daily load never got scary.
The Quick Checklist
If you are panicking and want the short version:
- Set new cards per day to zero.
- Pick a catch-up window and compute your daily number with the formula above.
- Choose one method: raw math, the two filtered decks, Set Due Date redistribution, or subject triage.
- Fix your lapse new interval to 40 to 50% if it is still on default.
- Delete or suspend your worst 10% of cards without guilt.
- Do it every day until the number is zero. Then set a daily review cap and turn new cards back on slowly.
The Bottom Line
A backlog is a queueing problem, not a character flaw. Do the catch-up math, pause new cards, and pick whichever method above matches your situation: raw math for a small pile, the two filtered decks for a medium one, Set Due Date redistribution for a big one, or subject triage when an exam is close. Do not reset the deck. Do not marathon. Work the pile down over a week or two and you will be surprised how much of it you actually remember.
And if the reason your sessions feel endless is that making the cards eats an hour a day, that is a separate problem with a separate fix. SlideToAnki turns your lecture slides into ready-to-review flashcards automatically, which moves the time you used to spend typing cards into the review sessions that actually clear the backlog. Clean, single-concept cards are also faster to review, so a caught-up deck built from tight cards stays caught up.