Work out spaced repetition schedule instantly with clear inputs, formula shown and shareable results.
Each interval is the previous one multiplied by the growth factor, and the review days are the running total of those intervals from the first study session. A geometric schedule keeps total review effort almost flat while retention keeps climbing, which is why six reviews can cover months rather than weeks.
Interval sequence
interval(k) = first interval x multiplier^(k - 1)
Review day
review day(k) = sum of intervals 1 through k
interval(k) = first interval x multiplier^(k - 1). Each interval is the previous one multiplied by the growth factor, and the review days are the running total of those intervals from the first study session.
A geometric schedule keeps total review effort almost flat while retention keeps climbing, which is why six reviews can cover months rather than weeks.
Enter first interval, interval multiplier, number of reviews. The defaults shown are a realistic worked example — swap in your own figures to get a result you can use.