Spaced Repetition Study Time Calculator

Spaced repetition schedules each card to reappear at growing intervals (for example 1 day, then a few days, then weeks). Once a deck reaches steady state, the daily review count is roughly the number of new cards you add each day multiplied by the average number of times each card is seen per day across its life, which is approximately the inverse of its average interval. This calculator estimates that steady-state load.

Steady state is when the rate of cards becoming due each day settles around a constant, because you add new cards at a steady pace and old cards mature into long intervals. At steady state the daily review count stops growing. The estimate here assumes you have reached that point with a constant new-cards-per-day rate.

Real schedulers respond to whether you remember each card: lapses reset intervals and add reviews, while easy cards stretch intervals and reduce them. The estimate uses your average interval as a single figure, so treat it as a planning average rather than an exact daily count. Increase the lapse allowance to be conservative.

Add fewer new cards per day, keep card content short so seconds-per-card stays low, and let mature cards reach long intervals rather than resetting them through frequent lapses. Reducing new cards per day has the largest effect because daily reviews scale directly with it.