Wikipedia: Forgetting rate

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The speed of forgetting. In 1885, Hermann Ebbinghaus discovered exponential? nature of forgetting. We can roughly describe forgetting with R=e^{(-S t)} where R is [memory retention]?, S is relative strength of memory and t is time. For this reason, strength of memory (S) is the best way to represent the forgetting rate. If you learn a foreign word today, in most cases, you stand only 90% chance to remember it after several days. Rate of forgetting decreases after each repetition, esp. if the repetition is made at the "right" time

The speed of forgetting. In 1885, Hermann Ebbinghaus discovered exponential? nature of forgetting. We can roughly describe forgetting with R=e^(-t/S) where R is [memory retention]?, S is relative strength of memory and t is time. For this reason, strength of memory (S) is the best way to represent the forgetting rate. If you learn a foreign word today, in most cases, you stand only 90% chance to remember it after several days. Rate of forgetting decreases after each repetition, esp. if the repetition is made at the "right" time (e.g. with spaced repetition)