How Many Flashcards Should You Do a Day (and in Total)?

It's the question everyone hits a few weeks into spaced repetition: the reviews are piling up and it's getting heavy. How many new cards a day is sustainable? How many reviews will that turn into? And before any of that — how many revision cards do you actually need for your exam? Here are practical answers to all three, with the working shown.

The short answer

• New cards a day: about 10–20 alongside other study, 20–40 for serious daily exam prep.
• Reviews that creates: after a few months, roughly 5–10 reviews a day for every new card you add daily — so 20 new a day settles around 100–200 reviews.
• Total cards: count the testable facts in one chapter, multiply by your chapters, then divide by the days you have left. That tells you whether your daily number is realistic.

The rest of this post explains where those numbers come from, so you can adjust them to your own situation.

The hidden cost of a new card

A new card isn't a one-time cost. Every card you add today comes back tomorrow, then in a few days, then next week, then next month — until you've truly learned it. A typical successful card is reviewed around day 1, day 4, day 11, day 32 and day 90 (see how spaced repetition works). That's about five reviews in its first three months, plus a few extra for the times you forget it.

Now add that card every day. After three months, each day's queue holds the day-1 review of yesterday's cards, the day-4 review of cards from four days ago, and so on. Add it up and the daily review count settles at about five to six times your daily new-card number, drifting higher as older cards reach their long intervals and occasionally lapse. That's where the 5–10× rule of thumb comes from.

The bottom row is how people burn out. Adding 100 cards a day feels productive for a week, then the reviews arrive and the whole system collapses.

How many revision cards do you need in total?

This is the planning question that matters most, and it's easy to answer with a little honest counting:

1. Card one chapter properly. Pick a typical chapter (or GCSE topic — see making revision cards) and make cards only for what could cost you marks: definitions, values, conditions, exceptions, cause-and-effect links, diagram labels. (How to decide: making flashcards from a textbook.)
2. Count them. Dense science chapters often land somewhere around 30–60 cards; lighter chapters far fewer. Your count beats any average.
3. Multiply by your chapters. That's your total deck.
4. Divide by the days until you want everything learned. That's your required new-cards-a-day.

A worked example

Say you're sitting 8 subjects, each with about 10 topics, and a typical topic gives you 30 cards:

• Total: 8 × 10 × 30 = 2,400 revision cards.
• You have 20 weeks and want everything learned with 4 weeks to spare, so 16 weeks = 112 days.
• 2,400 ÷ 112 ≈ 21 new cards a day.
• From the table, that settles around 100–200 reviews a day — roughly 15–30 minutes.

That's a sustainable plan. If your number comes out at 80 new cards a day, the maths is telling you something: start earlier, cut low-value cards, or accept that some material gets a lighter treatment.

Watch reviews, not new cards

The metric that actually matters is your daily review count, not how many new cards you made. A good rhythm:

1. Set a daily new-card limit and stick to it (most apps let you cap this).
2. Always clear your due reviews first, before adding anything new. Reviews are the studying; new cards are the backlog you're choosing to take on.
3. If reviews climb past what you can comfortably do, lower your new-card limit until they settle.

How the algorithm affects load

Your scheduler matters here. FSRS lets you set a target retention rate. Lowering it slightly (say 90% → 85%) lengthens every interval, which means meaningfully fewer reviews for a small drop in how much you recall. That's a direct lever on daily load when exam season gets busy. Raising it towards 95% does the opposite, and the cost climbs steeply — keep very high targets for the material that matters most. (Choosing a desired retention.)

Quality beats quantity

Twenty good, atomic cards you review every day will out-teach two hundred bloated ones you abandon. Signs you're over-making:

• Reviews feel like a chore you skip.
• Cards test three things at once (split them).
• You're carding things you'll never be tested on (cut them).

Every card you cut saves you five or more future reviews, so deleting a weak card is one of the most efficient things you can do.

If you're behind

Backlogs happen — exams, travel, a bad week. Don't panic-delete. Pause new cards, clear reviews over a few days (oldest and most important first), and consider your app's tools for spreading or postponing an overdue pile so it doesn't all land at once.

Do this in StudyTab

• Set the limit per deck. Cap new cards for each deck so one subject can't flood the queue.
• Watch the forecast. The schedule calendar shows how many reviews are due on each of the next 30 days, so you can spot a pile-up coming and lower your new-card limit before it lands.
• Tune retention per deck. Use a retention preset of 90% for core material and relax to 85% for breadth — the scheduler lengthens the intervals, and the FSRS settings show the workload difference as you change it.
• Skip the typing, not the thinking. The AI flashcard generator drafts atomic cards from your PDFs and notes, so your daily limit goes on learning rather than card-writing.

Bottom line

Work backwards from your exam: count the cards you really need, divide by the days you have, and check the review load that creates. For most students that lands around 20–40 new cards a day and 15–40 minutes of reviews. Judge your number by one test — whether you clear your reviews every day — and adjust until you do.