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Flashcard spaced repetition scheduler (SM-2)

The next review date for a flashcard using the SM-2 algorithm that powers Anki and SuperMemo. Grade how well you recalled the card (0–5) and give its current state — repetitions, ease factor and last interval — and it computes the new interval, the updated ease factor and when to see the card next.

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Need Next interval (days), New ease factor, New repetition count, Next review date? The Flashcard spaced repetition scheduler (SM-2) derives it from Recall quality (0–5), Repetitions so far, Ease factor, Previous interval (days) in one step.

How to use it

  1. Enter your values: Recall quality (0–5), Repetitions so far, Ease factor, Previous interval (days).
  2. Read the result instantly: Next interval (days), New ease factor, New repetition count, Next review date.

Frequently asked questions

What does the Flashcard spaced repetition scheduler (SM-2) actually compute?

It takes Recall quality (0–5), Repetitions so far, Ease factor and Previous interval (days) and derives Next interval (days), New ease factor, New repetition count and Next review date from them. The calculation is live as you type, so the result updates on every change.

What information do I need to provide?

4 values: Recall quality (0–5), Repetitions so far, Ease factor and Previous interval (days). Nothing else is required — no account, no file upload.

Which “Recall quality (0–5)” option should I choose?

You can pick between « 5 — Perfect, instant », « 4 — Correct, slight hesitation », « 3 — Correct, difficult », « 2 — Wrong, felt easy », « 1 — Wrong, familiar » and « 0 — Complete blackout ». Each one changes what the calculator works out, so switch and compare — the default is « 5 — Perfect, instant ».

When would I actually use this?

Working out where a term stands: the average so far, the mark still needed to reach a target, and what a grade means on another country's scale.

What is the most common mistake?

Averaging averages. A mean of subject means is only correct when every subject carries the same weight, and coefficients are exactly what most systems use to make sure they do not.

What is the difference between the Flashcard spaced repetition scheduler (SM-2) and the Study timer (Pomodoro) calculator?

This one returns Next interval (days) and New ease factor; the Study timer (Pomodoro) calculator returns Total focus time (min) and Total break time (min). That is the whole difference — open the one whose figure you need.

Is there a tool for the next step?

Language learning hours to fluency calculator is the closest one after this: How long it really takes to learn a language, based on the US Foreign Service Institute's difficulty categories. Pick your target language and CEFR level, your weekly study pace and prior experience — it estimates the total study hours and, at that pace, how many weeks and months you're looking at.

Where do the figures come from, and how current are they?

The weighting arithmetic is exact. Grading scales, pass marks and rounding rules are set by each institution or ministry, so a conversion between two systems is an equivalence, not an official transcript.

Further reading

All guides →
GuideWorking Out a Test Score: Negative Marking, Weights and Grade BoundariesPoints over total is trivial. What is not: averaging percentages instead of weighting them can shift a mark by twelve points, negative marking changes when guessing is worth it, and the same 62 % is a fail on one scale and an upper second on another. What the tool does, and the two things it cannot do.GuideThe Pomodoro Method: How Long to Work and How Long to RestTwenty-five and five come from Francesco Cirillo's method, not from a trial. What the research actually measured is task switching and the cost of getting back in — and the reason a fixed interval helps is not that 25 minutes is optimal. Plus what the planner really returns, including the long break it quietly leaves out.GuideWorking Out an Attendance or Absence Rate: the Denominator DecidesNine absences give five different rates depending on what you divide by — scheduled days, sessions, weekdays, calendar days, or a part-timer's own diary. What the tool computes, the three places it misleads, and why the Bradford Factor makes short repeated absences look ten times worse than one long one.ExplainerA Thousand French Words Covers 80% — and Tells You NothingWe measured the coverage curve of French on 313 million words of subtitles: the top 1,000 forms account for 80.77% of running text. Then we took a normal French sentence in which 80% of the tokens are inside that top 1,000, and showed that a reader who knows every one of them learns nothing from it.How-toHow to Calculate Your GPAGPA is a weighted average of your grades. Here's how to convert letter grades to points, weight by credits, and work out your overall GPA.How-toWhat Grade Do You Need on Your Final?Work out the exact final-exam grade you need to hit your target, from your current grade and the exam's weight. Here's the formula and an example.