Spaced Repetition Interval Calculator

Spaced repetition lengthens the gap after successful recall and shortens it after forgetting. This educational model resets Again to one day, multiplies Hard by 1.2, Good by 2.5, and Easy by 3.2. Those multipliers make the behavior visible, but they are not the exact scheduling rules used by Anki, Memly, or another app. Real schedulers use more history, configuration, and estimates of item difficulty.

An interval that is too short spends time on material that is still obvious. An interval that is too long raises the risk of complete forgetting. The useful zone is often a review that requires effort but still succeeds. Treat the displayed date as a starting point and adjust for exam deadlines, importance, and consequences of forgetting. Memly uses FSRS 6.0 with 21 parameters to model memory state at the card level rather than applying one fixed multiplier to every item.

This tool works without an account and processes the inputs in your browser. Treat the result as a decision aid, then compare it with the rules in your syllabus or the latest information from the testing provider. A number is most useful when it changes what you do next: isolate the weak material, turn it into a clear retrieval prompt, and schedule another attempt after some forgetting has occurred. That closes the loop between calculation and durable learning.