What is spaced repetition?

Spaced repetition is a study technique where you review material at increasing intervals. Instead of cramming everything at once, you space out your reviews so each card appears just before you would forget it. Research by Ebbinghaus and later studies show this approach dramatically improves long-term retention.

How does the spaced repetition calculator work?

Enter your total number of flashcards, your exam date, and how many minutes you can study each day. The calculator uses SM-2 style intervals (1, 3, 7, 14, 30, and 60 days) to build a day-by-day schedule showing exactly how many new cards to learn and how many reviews to complete each day.

What intervals does this calculator use?

The calculator uses intervals based on the SM-2 algorithm: reviews at 1 day, 3 days, 7 days, 14 days, 30 days, and 60 days after first learning a card. These intervals are backed by research on the forgetting curve and optimize the balance between review frequency and long-term retention.

How long does it take to study each flashcard?

The calculator estimates about 30 seconds per new card (first time learning) and about 10 seconds per review card. These are averages -- simple vocabulary cards may take less time, while complex science or math concepts may take more.

What if I don't have enough time before my exam?

The calculator will warn you if your card count, exam date, and daily study time don't add up. You'll see exactly how many cards you can cover and suggestions for adjusting your plan -- either increase daily study time, start earlier, or reduce the number of cards.

Is this the same as Anki's algorithm?

This calculator uses intervals inspired by the SM-2 algorithm, which is the foundation for Anki and most spaced repetition software. The actual intervals (1, 3, 7, 14, 30, 60 days) are simplified for planning purposes. Anki adapts intervals dynamically based on your performance, while this calculator gives you a fixed schedule for planning ahead.

Spaced Repetition Calculator - Plan Your Review

Build Your Schedule

Your Review Schedule

Study days

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New cards

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Total reviews

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Last study day

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Date	New	Review	Time	Load

New = cards you're seeing for the first time Review = cards coming back for spaced review

The Science of Spaced Repetition

Spaced repetition works because of how your brain forms and maintains memories. In 1885, Hermann Ebbinghaus documented the forgetting curve -- showing that without review, you lose roughly 70% of new information within 24 hours. But each time you successfully recall something, the memory gets stronger and the forgetting curve flattens. Space your reviews at the right intervals, and you can remember nearly everything with surprisingly little total study time.

Modern research backs this up. A 2006 meta-analysis by Cepeda, Pashler, Vul, Wixted, and Rohrer analyzed 254 studies and confirmed that distributed practice (spacing your study over time) consistently outperforms massed practice (cramming). The optimal gap between reviews grows as the material becomes more familiar -- exactly what this calculator models. For a deeper look at the research, see our article on the science behind Flashcard Buddy.

The other half of the equation is active recall -- the act of retrieving information from memory rather than passively re-reading it. Karpicke and Roediger (2008) demonstrated that students who practiced retrieval retained 80% of material after one week, compared to 36% for those who only re-studied. Flashcards are one of the most practical ways to force active recall, and spaced repetition tells you when to do it.

How the intervals work

This calculator uses intervals based on the SM-2 algorithm, originally developed by Piotr Wozniak in the 1980s and used in most modern spaced repetition software. After you first learn a card, you review it at expanding intervals:

Day 1 -- immediate reinforcement while the memory is fresh
Day 3 -- catches material starting to fade
Day 7 -- one week consolidation
Day 14 -- two week check
Day 30 -- monthly review for long-term storage
Day 60 -- final reinforcement for durable retention

Each successful review strengthens the memory trace. If you get a card wrong in a real study session, the interval resets -- but for planning purposes, this calculator assumes you'll get most cards right, which is a reasonable estimate when you're learning actively.

Making better flashcards

A spaced repetition schedule is only as good as your cards. Vague or poorly written cards lead to confusion during review, which wastes time and hurts retention. Our guide on how to make good flashcards covers the key principles: one concept per card, clear and specific questions, and answers you can verify quickly. If you're preparing for a specific exam, check our guide to studying for finals for a complete study plan that integrates spaced repetition with other proven techniques.

How Flashcard Buddy Handles This Automatically

This calculator gives you a plan. Flashcard Buddy executes it for you. When you study with the app, every card is automatically scheduled using a spaced repetition algorithm -- no spreadsheets, no manual tracking, no calendar math.

Each time you review a card, the app adjusts the next review date based on how well you knew the answer. Cards you struggle with come back sooner. Cards you know well get pushed further out. The algorithm adapts to your actual performance rather than using fixed intervals, which means your study time is always focused where it matters most.

You also get learning insights that show your retention rate, streak data, and upcoming review load -- so you can see how your studying is paying off without calculating anything by hand.

This calculator

Fixed intervals for planning
Static schedule you follow manually
Great for understanding the concept
No account needed

Flashcard Buddy app

Adaptive intervals based on your answers
Automatic scheduling -- just show up
Progress tracking and insights
AI-generated flashcards from your notes

Frequently Asked Questions

What is spaced repetition?: Spaced repetition is a study technique where you review material at increasing intervals. Instead of cramming everything the night before, you space out your reviews so each card appears just before you'd forget it. Research shows this approach leads to dramatically better long-term retention compared to massed study sessions.
How does the spaced repetition calculator work?: Enter your total flashcard count, your exam date, and how many minutes you can study each day. The calculator uses SM-2 style intervals (1, 3, 7, 14, 30, and 60 days) to build a day-by-day schedule showing exactly how many new cards to learn and how many reviews to complete each day. It estimates about 30 seconds per new card and 10 seconds per review.
What intervals does this calculator use?: Reviews are scheduled at 1, 3, 7, 14, 30, and 60 days after you first learn a card. These intervals are based on the SM-2 algorithm and research on the forgetting curve. They balance review frequency against long-term retention -- reviewing often enough to prevent forgetting, but not so often that you waste time on material you already know.
What if I don't have enough time before my exam?: The calculator will show a warning telling you exactly how many cards you can realistically cover. From there, you have three options: increase your daily study time, start studying earlier, or prioritize the most important cards and reduce your total count. Even partial spaced repetition is better than cramming everything at the last minute.
Is this the same as Anki's scheduling algorithm?: The intervals are inspired by the same SM-2 algorithm that Anki uses, but simplified for planning purposes. Anki adjusts intervals dynamically based on whether you got each card right or wrong. This calculator uses fixed intervals to give you a predictable schedule you can plan around. For adaptive scheduling that responds to your actual performance, try studying with Flashcard Buddy.
How many flashcards can I realistically study per day?: With 30 minutes of focused study, most people can learn 20-30 new cards and complete 50-100 reviews per day. The exact number depends on card complexity -- simple vocabulary cards go faster than dense medical terminology. This calculator factors in both new card time and review time to give you a realistic daily workload.

Skip the Spreadsheet

Flashcard Buddy handles spaced repetition scheduling automatically. Create or import your flashcards, and the app tells you exactly what to study each day -- no manual planning needed.

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Spaced Repetition Calculator