Plan your flashcard review workload using the Leitner system. Calculate daily card reviews, new cards, and projected completion timeline.
The Flashcard Review Schedule Calculator projects your daily review workload based on the Leitner box system. By modeling how cards move through progressive review stages, this tool shows you how many new and review cards you will face each day and how long it will take to master your entire deck.
The Leitner system organizes flashcards into boxes with increasing review intervals. New cards start in Box 1 (reviewed daily), and correctly answered cards advance to Box 2 (every 2 days), Box 3 (every 4 days), and so on. Incorrectly answered cards return to Box 1. This ensures you spend the most time on the material you find hardest.
By entering your total deck size and desired new cards per day, you can project the daily workload over weeks. This prevents the common mistake of adding too many new cards and becoming overwhelmed by a mountain of due reviews, which is the number one reason students abandon flashcard systems.
Managing flashcard review load is critical for sustainable study habits. Without planning, students often add too many new cards early on and face an unsustainable review burden within weeks. This calculator helps you find the right pace of new card introduction to keep daily reviews manageable, predict how long it will take to complete your deck, and avoid the review pile-up that causes most people to quit using flashcards.
Daily Reviews = New Cards + Cards Due from Each Box Box 1: review every 1 day Box 2: review every 2 days Box 3: review every 4 days Box 4: review every 8 days Box 5: review every 16 days (mastered) Steady-State Daily Reviews ≈ New/Day × (1 + 1/2 + 1/4 + 1/8 + 1/16) ≈ New/Day × 1.94 Daily Time = Daily Reviews × Seconds Per Card / 60
Result: ~39 reviews/day, 25 days to introduce all cards
With 20 new cards daily, steady-state reviews are approximately 20 × 1.94 = 38.8 cards from older boxes, plus 20 new cards = ~59 total at peak. At 8 seconds per card, that's about 7.8 minutes per day. All 500 cards are introduced within 25 days.
Your daily review load grows as you add new cards because older cards cycle back for review from their respective boxes. The growth peaks when cards fill all boxes and then stabilizes. The steady-state formula (new cards × 1.94) gives a good approximation of the peak daily load from reviews alone.
The most common flashcard failure mode is review overload. Students enthusiastically add 50+ new cards daily, then face 200+ reviews within two weeks and quit. This calculator helps you predict and prevent this by showing projected review loads before you start.
Effective flashcards follow the minimum information principle — each card should test one atomic fact. Complex cards that require recalling multiple pieces of information simultaneously slow down reviews and reduce retention. Break complex topics into multiple simple cards.
Stop adding new cards 2–3 weeks before an exam. This allows you to focus entirely on reviewing existing material and ensures all cards get sufficient repetitions. During this review-only phase, daily workload decreases naturally as cards advance to higher boxes.
The Leitner system is a flashcard learning method invented by Sebastian Leitner in the 1970s. Cards are sorted into boxes based on how well you know them. Correctly answered cards advance to higher boxes with longer review intervals. Incorrect cards return to Box 1 for more frequent review.
For most students, 15–25 new cards per day is sustainable. Medical students sometimes handle 40–50 with dedicated study time. Start conservatively and increase only after confirming your daily review load remains under 30–45 minutes.
The introduction phase takes total cards divided by new-per-day days. After the last new card is introduced, continue reviewing for another 2–4 weeks to allow all cards to advance through the boxes. Full mastery typically takes 1.5–2× the introduction duration.
Review pile-up is the biggest risk in flashcard systems. If you miss a few days, hundreds of cards can become due simultaneously. The solution is to always prioritize reviews over new cards, take review-only days when needed, and never add new cards when you have a backlog.
Yes. Anki uses a similar spaced repetition algorithm (SM-2). The Leitner box model in this calculator provides a simplified approximation. Your actual Anki review load may vary based on the specific SM-2 parameters and your accuracy rate.
Aim for 5–15 seconds per card. If a card consistently takes more than 15 seconds, it may be too complex and should be split into simpler questions. If you answer in under 3 seconds, the card may be too easy and could be suspended.