Spaced repetition schedule
The best dates to review a subject so you don't forget it (forgetting curve).
How it works
Each review strengthens memory, so the next ones can be spaced further apart (inspired by Ebbinghaus and the Leitner system).
Results are for guidance only and do not replace professional advice.
Worked example
With the default values:
- Date you first learned it31 October 2026
- PaceNormal: day 1, 3, 7, 14, 30, 60
you get:
- Next reviewSunday, 1 November 2026
- Suggested time per review10 to 20 min (active recall, flashcards, exercises)
Frequently asked questions
How does the “Spaced repetition schedule” tool work?
Each review strengthens memory, so the next ones can be spaced further apart (inspired by Ebbinghaus and the Leitner system).
What do I need to enter?
Just fill in: date you first learned it, pace. The result updates as you type.
Can you give an example?
Date you first learned it: 31 October 2026; Pace: Normal: day 1, 3, 7, 14, 30, 60 → Next review: Sunday, 1 November 2026; Suggested time per review: 10 to 20 min (active recall, flashcards, exercises).
Is this calculator free, and is my data private?
Yes. HOD Calc is completely free with no sign-up. The calculation runs in your browser: nothing you type is sent or stored.