Spaced Repetition Calculator
Plan a Leitner-style spaced-repetition schedule: pick a start date and review intervals and get the exact calendar dates to study, so material moves into long-term memory. Runs entirely in your browser.
Reviews scheduled
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How spaced repetition works
Spaced repetition fights the "forgetting curve" by reviewing material at gradually widening intervals. Each review date is the running total of the gaps since your first study session:
review date = first study date + sum of gaps so far
This is a classic Leitner-style schedule. If you recall an item easily, push it further out; if you struggle, restart its intervals. Treat the dates as a guide, your own recall is the real signal. Everything is calculated in your browser.
What this does
A spaced repetition calculator plans a Leitner-style schedule — pick a start date and review intervals and get the exact calendar dates to study, so material moves into long-term memory.
How to use it
- Pick a start date.
- Enter your review intervals.
- Generate the schedule.
- Add the dates to your calendar.
How it works
Reviewing at widening intervals — just before you would forget — strengthens memory far more than cramming. A common set is 1, 3, 7, 14, 30, and 90 days.
Understanding your result
The widening intervals are the point: reviewing just before you would forget moves material into long-term memory far more efficiently than cramming. Treat the dates as commitments rather than suggestions, and if a topic keeps slipping, shorten its interval; once it sticks reliably, the gaps can stretch further apart.
Example
Starting today, the next reviews land in 1, 3, and 7 days.
Sources & methodology
Last updated .
Frequently asked questions
What is spaced repetition?
It is a study technique where you review material at gradually widening intervals \u2014 just before you would forget it \u2014 which strengthens long-term memory far more efficiently than cramming.
What intervals should I use?
A common starting point is 1, 3, 7, 14, 30 and 90 days. Use shorter gaps for hard material and longer ones once recall is easy; you can enter your own custom intervals.
Is my schedule stored anywhere?
No. The dates are calculated in your browser from the start date you choose and nothing is saved or sent anywhere.
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