Spaced repetition calculator: when to review what you learned
Pick the day you first studied a topic and the calculator gives you the dates to review it, using the 1, 3, 7, 14 and 30 day intervals of a Leitner schedule or gaps you choose. Download the dates as a calendar file so the reminders come to you.
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Pick a date and at least one interval to see your review dates.
How to use it
- 1Enter the date you first learned the topic, and an optional name for it.
- 2Choose the Leitner preset (1, 3, 7, 14 and 30 days) or type your own intervals in days.
- 3Read the review dates in the table, or download a calendar file (.ics) and open it in Google Calendar, Apple Calendar or Outlook.
Why spacing your reviews works
Reviewing a topic a few times with growing gaps leads to better long-term memory than the same amount of study crammed together. This is the spacing effect, and a large review of the research by Cepeda et al. (2006) found it across hundreds of studies.
Each review should be a test, not a reread: close your notes and try to recall the main points, then check. Retrieval at spaced intervals is the combination rated most useful in the Dunlosky et al. (2013) review of study techniques.
Choosing the intervals
There's no single correct schedule. Short first gaps catch forgetting early; longer later gaps keep the work small. If your exam is close, use shorter intervals so the last review lands before the exam. If you struggle on a review, start the sequence again from the first interval.
Questions
What are the best spaced repetition intervals?
A common starting point is 1, 3, 7, 14 and 30 days after first learning. Adjust them to your exam date and how well you remember at each review.
What should I do at each review?
Test yourself: recall the topic without looking, answer practice questions or flashcards, then check what you missed.
Can I add the review dates to my calendar?
Yes. Download the .ics file and open it in Google Calendar, Apple Calendar or Outlook. Each review becomes an all-day event.
Is anything saved or sent anywhere?
No. The dates are calculated in your browser.
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