How to Memorize Things Fast: 9 Evidence-Based Methods

Short answer

• The fastest reliable way to memorize things is to test yourself from memory instead of rereading. In a 2006 experiment, students who read a passage once and then spent three sessions recalling it remembered 61 percent of it a week later, against 40 percent for students who read it four times.
• Spread the same study time over several days. A major review of 317 experiments found spaced study beat massed study in 259 of 271 direct comparisons.
• Break material into chunks of about four items, because working memory holds only a few chunks at once. Then attach each chunk to something you already know.
• Use mnemonics, such as acronyms, rhymes, and memory palaces, for arbitrary lists and ordered material. They speed up first learning but still need spaced review.
• Explain the material in plain words, mix related topics in one session, and protect your sleep. Sleep helps consolidate what you studied during the day.
• No technique guarantees total recall. The methods in this guide improve the odds of remembering, and the size of the gain depends on the material, the test, and how consistently you practice.

What “Fast” Can and Cannot Mean

“Fast” in memorization usually means two different things, and they pull in opposite directions. The first is speed of first learning: how quickly you can get through a list once and repeat it back. The second is durability: how much of it you still remember a week later, when it counts. Cramming is fast in the first sense and slow in the second. The methods in this guide aim at the combination: less wasted time now, and more retained later.

A useful starting point is the difference between recognition and recall. Recognition is knowing you have seen something before. Recall is producing it without clues. Most exams, job tests, and real-life demands need recall, but most study methods only build recognition. Reading notes over and over feels productive precisely because recognition grows quickly. The gap only shows up when the page is taken away. The University of California San Diego psychology department puts it plainly in its guidance on effective studying: simply studying materials over and over is not the most effective way to learn, because exams require you to retrieve information from memory, not to recognize it.

There is also an old finding that explains why forgetting feels so sudden. In the 1880s, German psychologist Hermann Ebbinghaus tested his own memory using nonsense syllables, strings of letters with no meaning, so that prior knowledge could not help him. He found that newly learned material fades fastest in the first hours and days, and that reviewing it at spaced intervals flattens that drop. His work was a self-experiment with one participant, himself, and modern researchers have refined his conclusions, but the basic pattern has held up across more than a century of research: forgetting is fast at first, and spacing reviews is the main defense against it.

One more clarification before the methods. This article is about general memorization: facts, lists, names, dates, concepts, and procedures. It is not about memorizing a speech, which has its own demands, because a speech must come out in order, out loud, in front of people. If that is your goal, the speech-specific plan in How to Memorize a Speech covers it, including how to recover if you lose a line on stage. The techniques here overlap with that guide, but the examples and the practice plan below are built for study material. Note also that “memory” here means human memory, not computer memory. If you want the computing sense of the word, Is Memory the Same as RAM explains the difference. That article is in the same publishing wave as this one, so confirm it is live before relying on the link.

The Two Methods With the Strongest Evidence

Not all study advice is equal, and a landmark review makes the gap easy to see. In 2013, John Dunlosky and four colleagues reviewed ten learning techniques that students commonly use, judging each one on whether its benefits hold across different ages, abilities, materials, and types of test. Their review appeared in Psychological Science in the Public Interest. Only two techniques received a high utility rating: practice testing and distributed practice, which is the technical name for spaced study. Three received a moderate rating: elaborative interrogation, self-explanation, and interleaved practice. Five received a low rating: summarization, highlighting, the keyword mnemonic, imagery use for text learning, and rereading.

That verdict is worth keeping in mind while reading the rest of this guide. The two highest-rated techniques are the ones students use least on their own, and the lowest-rated ones are the most popular. Rereading and highlighting feel effective because they build familiarity, and familiarity is easy to mistake for learning. The rest of this article is organized around the same order of evidence: the two high-utility methods first and in the most detail, then the moderate ones, then the popular low-utility habits and what to do instead.

A later meta-analysis pooled the ten techniques across 242 studies with more than 169,000 participants and reached a similar ordering: distributed practice and practice testing were the most effective techniques overall. The authors cautioned that most of the underlying studies measured factual recall rather than deep understanding, so the ranking is strongest for the kind of material this article covers: facts, terms, lists, and procedures.

Method 1: Test Yourself Before You Feel Ready

Retrieval practice means pulling information out of memory instead of putting it back in. Read a section once, close the book, and write or say everything you remember. Then check what you missed, correct the gaps, and try again. That loop, recall then check, is the single highest-return change most people can make to how they memorize.

The best-known measurement of the effect comes from a 2006 experiment by Henry Roediger and Jeffrey Karpicke at Washington University in St. Louis, published in Psychological Science. Students studied short science passages under different schedules with the same total time. In the experiment’s second study, students who read a passage four times recalled 40 percent of its ideas on a test one week later. Students who read it once and spent the other three sessions recalling it from memory recalled 61 percent a week later. The pattern reversed on a test given five minutes after studying, where the rereading group scored higher, 83 percent against 71 percent. Rereading wins in the moment and loses after a delay, which is exactly why it feels like it works. The experiment used short passages and undergraduate students, and the recall tests had no feedback, so the exact percentages describe that setup rather than a promise about any exam.

A follow-up experiment by the same researchers, published in Science in 2008, sharpened the point. Students learned 40 Swahili-English word pairs. Once a pair had been recalled correctly, some students kept studying it but stopped being tested on it, while others kept being tested on it but stopped studying it. Repeated studying after a correct recall produced no measurable benefit a week later. Repeated testing produced a large benefit: the groups that kept being tested recalled about 80 percent of the pairs a week later, against roughly 30 to 40 percent for the groups dropped from further testing. The lesson is blunt. Once you can recall something once, more reading of it adds little. More recall of it adds a lot.

A 2014 meta-analysis by Christopher Rowland pooled 159 effect sizes from 61 studies comparing testing with restudying and found an overall advantage for testing of g equal to 0.50, a medium-sized effect. The advantage was largest when tests came with feedback and when the final test was a day or more later. Results varied between studies, so the average is a guide rather than a promise, but the direction is consistent: testing beats restudying for delayed recall.

How to use retrieval practice in an ordinary study session:

• Close the book first. After reading a page or a section, put it aside and write down everything you remember on a blank sheet, or say it aloud. Do not peek at the first word and then continue, because that peek is doing part of the recall for you.
• Check honestly, then correct. Compare what you produced with the source. Mark what you missed, what you got wrong, and what you changed the meaning of. Correct the meaning first and the wording second.
• Repeat until you can recall it, then keep going. The University of California San Diego guidance describes a method called successive relearning: practice recalling until you can get each item right, then repeat the process on later days. Stopping at the first correct recall wastes the strongest part of the effect.
• Use the test format you will face. If the real test is multiple choice, practice with multiple choice questions. If it is an essay, practice writing answers from memory. If it is spoken, practice speaking. Practicing in the way you will be tested is part of the method, not an extra.
• Make your own questions. Turning headings into questions before you read gives you a ready-made test afterward. Practice questions in textbooks and from instructors work the same way.

Flashcards are one tool for retrieval practice, not a separate method. A card works when the front asks a question you must answer from memory and the back gives the answer for checking. Cards fail when they are used as miniature notes to reread. For a closer look at building cards that actually test recall, including how to use them with children, see How to Use Flashcards Effectively With Kids. Practice tests also serve a second purpose: they are a form of assessment, and assessment is how you find out what you actually know. The companion article Assessment of Learning Outcomes and Competencies explains how assessment works in education more broadly. It is in the same publishing wave as this article, so confirm it is live before relying on the link.

If you take only one idea from this guide, take this one: the moment you close the material and try to recall it is the moment the learning happens. Everything else supports that moment.

Method 2: Spread the Same Minutes Over Days

Spaced repetition, also called distributed practice, means studying the same material in several short sessions separated by gaps, instead of one long session. The total time is the same. The retention is not.

The scale of the evidence is unusual. Cepeda, Pashler, Vul, Wixted, and Rohrer reviewed 317 experiments from 184 articles in a 2006 synthesis in Psychological Bulletin, covering research from 1885 to 2002. Across 271 direct comparisons of spaced and massed study with equal study time, spaced study won 259 times. Averaged across all retention intervals, final recall was about 47 percent after spaced study and about 37 percent after massed study, and the advantage grew with the delay before the test. The authors noted a limit worth knowing: most of the underlying studies tested retention within a day, so the evidence is thickest at short delays and thinner at very long ones.

A large follow-up experiment by Cepeda and colleagues in 2008 tested the gap directly. More than 1,300 people learned obscure facts in two sessions, with gaps from minutes to months between them, and took a final test from a week to almost a year later. For each delay there was a best gap, and it grew as the delay grew: for a test a week away, a gap of about one day worked best, while for a test 70 days away, a gap of about 21 days worked best. The exact best gap is not a fixed rule to memorize. The practical point is that the gap should grow with the horizon: short gaps for a test this week, longer gaps for a test next month.

A workable schedule for material you need in two weeks:

Three rules make spacing work in practice:

• Retrieve before you review. Start each spaced session by recalling what you can without looking. Only then open your notes to fill the gaps. Spacing paired with passive rereading wastes much of its power.
• Mix old and new. The University of California San Diego handout on studying less and remembering more suggests covering mostly old material with some new material in each session, roughly 75 percent old and 25 percent new. Each session then reviews yesterday and adds a little today.
• Use a simple box system. The Leitner system, a card-box method described by Sebastian Leitner, sorts flashcards into boxes by how well you know them. A card you recall correctly moves to a less frequent box. A card you miss moves back to the daily box. Paper index cards and a few small boxes are enough. Apps that schedule reviews do the same job. The scheduling is not the magic part. The spacing is.

If you have only one day, spacing still helps on a smaller scale. Separate your sessions by hours, not minutes. Learn a chunk, do something else, return to it, and test it again. Cramming may feel productive because the words are fresh, but freshness during practice is not the same as recall hours later. For help turning a spaced schedule into a full plan, see How to Create a Study Plan.

Method 3: Chunk Information Into Groups of About Four

Chunking means grouping separate items into a single meaningful unit, so that several facts take up one slot in working memory instead of several. A phone number is the classic example: 10 separate digits are hard to hold, but three groups, area code, exchange, and number, are easy, because each group is one chunk.

The size of the limit has been debated for decades. In 1956, George Miller summarized evidence that people can hold about seven items in short-term memory, plus or minus two. In 2001, Nelson Cowan reviewed a wide range of evidence in Behavioral and Brain Sciences and argued that the real limit, when people cannot rehearse or use tricks to combine items, is closer to four chunks, with a range of about three to five. The exact number matters less than the practical rule: keep each group small, about three or four items, and make each group meaningful.

How to chunk study material:

• Group by meaning, not by order on the page. Four causes of a war, four steps in a process, four symptoms of a condition. The group should have a reason to belong together.
• Give each chunk a label. A short label, such as “the three trade routes” or “the four test types,” acts as a handle. When you recall the label, the items inside it follow more easily.
• Build chunks in layers. Four chunks of four items can hold sixteen facts, if each chunk is itself a meaningful unit. This is how experts remember long sequences: they are not holding more items, they are holding bigger chunks.
• Write the chunk, then close the page. Chunking only helps if you then practice recalling the chunk, as in Method 1. A tidy set of groups that you only reread is still rereading.

Chunking is also the first step in organizing notes into a form you can study from. A set of notes grouped by idea, with a label on each group, is already halfway to a study guide. For a full method, see How to Create a Study Guide.

Method 4: Use Mnemonics for Arbitrary Lists

Some material has no natural structure to understand, only an order to remember: a list of names, a sequence of steps, a set of terms. That is where mnemonics earn their place. A mnemonic is a device that gives meaningless material a meaningful handle.

• Acronyms. Take the first letter of each item and make a word. The colors of the rainbow, red, orange, yellow, green, blue, indigo, violet, become ROYGBIV. The method works best when the word itself is easy to say and remember.
• Acrostics. Make a sentence from the first letters. “My Very Educated Mother Just Served Us Noodles” encodes Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune. The sillier the sentence, the better it tends to stick, because distinctive images are easier to recall than plain ones.
• Rhymes and songs. A short rhyme turns a sequence into a rhythm. This is why children learn the alphabet as a song and why adults still remember rhymes from school decades later.
• The keyword method. For a new word, pick a familiar word that sounds similar, then picture the two interacting. Dunlosky and colleagues rated the keyword mnemonic as low utility overall, which is a fair warning: it helps with single foreign words and names, and it is weak for connected text. Use it for vocabulary, not for chapters.
• The memory palace, or method of loci. Choose a place you know well, such as your home, and pick a route through it. Place one vivid image for each item along the route, in order. To recall the list, walk the route in your mind and collect the images. The technique is ancient, and modern research has tested it directly. In a 2021 study in Science Advances, Wagner and colleagues compared memory athletes ranked among the world’s top 50 in memory sports with people who had never used mnemonics, and then trained a second group for six weeks in the method of loci. Memory training improved durable, longer-lasting memories, and brain imaging showed changes in the regions involved in encoding and recognition. The study used word lists and trained participants, so it shows what the method can do with practice, not what it does on a first try. Building a palace takes time, so save it for ordered lists you must keep for weeks, such as the steps of a procedure or the points of a presentation. For a speech, where order and delivery both matter, the speech guide’s section on the method of loci applies the same idea to a script: How to Memorize a Speech.

Two honest limits apply to all mnemonics. First, they speed up first learning more than they guarantee long-term retention, so a mnemonic still needs spaced review. Second, a mnemonic can become a single point of failure: if you forget the acronym, you lose the whole list. The fix is to practice recalling the material both with and without the mnemonic, so the device is a scaffold rather than the only route in.

Method 5: Understand It First, Then Memorize It

Memorizing material you do not understand is like learning directions in a language you do not speak. You may repeat the sounds correctly for a while, but you cannot recover if you lose your place, because you do not know where you are going. Understanding first is not a delay in memorizing. It is part of memorizing.

Dunlosky and colleagues rated two understanding-based techniques as moderate utility: elaborative interrogation and self-explanation. Elaborative interrogation means asking why a fact is true and answering in your own words. Self-explanation means explaining each step of a solution or each part of a text to yourself as you go. Neither is as strong as retrieval practice or spacing, but both beat rereading, and both help most on material that has a logic to it: causes and effects, steps in a process, arguments with reasons.

Three ways to put this into practice:

• Ask “why” three times. For each fact, ask why it is true, then why that answer is true, then once more. If you cannot answer, you have found a gap in understanding, not a gap in memory. Fill it before you drill the fact.
• Explain it in plain words. The Feynman technique, named after physicist Richard Feynman, is a popular version of self-explanation: explain the idea as if teaching it to someone with no background, using short sentences and everyday words. Wherever you reach for jargon to hide a gap, stop and work out what the jargon means. Then write the explanation down and test yourself on it later. There is no controlled trial proving the Feynman technique by that name, so treat it as a useful form of self-explanation rather than a proven method of its own.
• Connect new facts to old ones. New information sticks better when it attaches to something you already know. Before memorizing a new set of terms, ask what it resembles, what it contradicts, and where it fits in a bigger picture you already understand. A fact with three connections has three routes back to it. A fact with none has one, and it is fragile.

This is also why starting with the structure of a topic beats starting with its details. Read the headings first, sketch the shape of the argument, and then fill in the facts. A study guide built this way doubles as a memory aid: the structure is the set of cues you will use to recall the details. For a general approach to building that structure, see How Do You Study.

Method 6: Mix Related Topics in One Session

Interleaving means mixing different types of problems or topics within a single practice session instead of finishing each one in a block. If you are studying three kinds of math problem, you shuffle them so that each question forces you to choose the right method, not just run the method you already know is coming.

The classic test of the idea comes from Rohrer and Taylor in 2007, published in Instructional Science. Eighteen undergraduates learned to calculate the volume of four unfamiliar solids, such as a wedge and a half cone, and practiced 16 problems in each of two sessions a week apart. One group practiced blocked, four of one solid then four of the next. The other group practiced shuffled. During practice, the blocked group looked far better, solving 89 percent correctly against 60 percent for the mixed group. On a test of new problems one week later, the result flipped: the mixed group scored 63 percent and the blocked group 20 percent. Almost every blocked-group error came from choosing the wrong formula, not from using the right one badly. The blocked students knew how to solve each type. They had not learned which problem called for which method. Eighteen students is a small sample, so treat the size of the gap as an illustration rather than a promise, but the pattern has been repeated in larger classroom studies since, and a 2019 meta-analysis pooling 59 studies found an overall benefit of moderate size.

Interleaving works best where the hard part is telling similar things apart: problem types that share surface features, artists with neighboring styles, organ systems where the challenge is diagnosis rather than recall of a single fact. It works poorly as a first step, because you need to know each method before you can practice choosing between them. A sensible order is to learn one type, then a second, then mix them. Mixing from the start, before either type is understood, mostly creates confusion.

Method 7: Match the Method to the Material

No single technique fits everything. The table below is a starting point for choosing.

For dense professional material, the schedule matters as much as the technique. Medical students, for example, face thousands of facts with long retention horizons, and the spaced retrieval approach in this guide is built for exactly that load. For a subject-specific plan, see How to Study for Medical School.

Method 8: Sleep on It, Literally

Sleep is part of memorization, not a break from it. Harvard Health Publishing at Harvard Medical School summarizes the pattern simply: learn something new during the day, and reinforce what you have learned while you sleep. The sleeping brain strengthens two kinds of memory: declarative memory, for facts, dates, and names, and procedural memory, for skills. In general, non-rapid eye movement sleep supports declarative memories, while rapid eye movement sleep supports procedural memories, and the sleeping brain works hardest on the most difficult learning tasks. Harvard Health notes that the best results seem to require seven to nine solid hours of sleep, including the last rapid eye movement period of the night.

Two practical consequences follow. First, an all-nighter trades encoding quality for panic. A short review followed by sleep usually beats a third reread at 3 a.m., because the review gives the sleeping brain something to consolidate and the reread gives it exhaustion. Second, a review shortly before bed is a reasonable part of a spaced plan: study, sleep, then test yourself in the morning. Sleep does not replace rehearsal, and no sleep trick guarantees recall, but skipping sleep removes one of the few free advantages the research offers.

A wind-down routine helps here, because the review only works if you actually sleep afterward. For a practical evening system, see Bedtime Habits for Better Sleep: A Wind-Down System That Fits Real Evenings. Stress is the other half of the same problem: anxiety before a test narrows attention and makes recall harder, so a plan for the evening before an exam should cover calm as well as content. See How to Manage Stress While Studying.

Method 9: Build a Short Session That Uses All of It

A good memorization session is short, structured, and mostly recall. Here is a 50 minute session you can run with any material.

1. Minutes 0 to 5: plan the session. Pick one chunk of material, small enough to finish. Write down what you will be able to recall by the end. If the chunk is too big to state as one goal, split it.
2. Minutes 5 to 15: learn it once, with understanding. Read the material, ask why each point is true, and restate it in your own words. Make a short list of the points to recall.
3. Minutes 15 to 30: close the book and recall. Write or say everything you remember. Check against the source, correct the gaps, and recall again. Repeat until you can get it right.
4. Minutes 30 to 40: mix it up. If you studied two related topics, shuffle practice questions from both. If you studied one list, test yourself in a different order.
5. Minutes 40 to 50: make the next review. Turn your misses into flashcards or questions, and write down when you will review them: tomorrow, in three days, and a week later.

Between sessions, protect your attention. Distraction during a recall attempt breaks the attempt, and a broken attempt teaches little. If focus is the problem rather than the method, the practical fixes are in How to Focus While Studying.

For children, the same principles apply with shorter sessions and more guidance. A ten minute recall game beats an hour of rereading, and the adult’s job is to ask the questions and check the answers kindly. For age-appropriate versions of these techniques, see Best Study Tips for Kids.

A One-Week Plan and a 48-Hour Emergency Plan

If you have a week, the plan below uses every method in this guide without overloading any single day.

• Day 1: Understand the material. Read it once, sketch its structure, chunk it into labeled groups, and make flashcards or practice questions for each chunk.
• Day 2: First recall session. Close the book and recall each chunk. Correct the gaps. Build a mnemonic for any list that keeps failing.
• Day 3: Mix and explain. Interleave related topics, explain the hardest chunk in plain words, and retest yesterday’s misses.
• Day 4: Rest day for this material, or a light five minute recall only. Study something else.
• Day 5: Second full recall. Test everything from memory, in a different order. Promote the cards you know, and keep the ones you miss in daily review.
• Day 6: Practice in test conditions. Timed, in the format you will face, without notes. Check, correct, and note the remaining weak spots.
• Day 7: Light review and sleep. A short morning recall, then stop. A good night of sleep before the test matters more than a final cram.

If you have only 48 hours, do not try to run the week in miniature. Cut the scope first: list what will actually be tested, drop trivia, and memorize that list only. Then run tight loops inside the window: morning recall, evening recall, next morning recall, and a final check before the test. Even with two days, spacing inside the window beats one long session, and retrieval beats rereading at every step.

What Does Not Work

A short list of popular habits that the research does not support, and what to do instead.

• Rereading notes until they feel familiar. Familiarity is recognition, not recall. Replace rereading with a closed-book recall attempt, then read only to correct what you missed.
• Highlighting most of a page. Highlighting marks what you have seen, not what you know. Dunlosky and colleagues rated highlighting as low utility. If you highlight, highlight only after you have tried to recall the page, and only the points you missed.
• Copying notes neatly. Rewriting notes can feel like studying, but if you are copying rather than recalling, it is transcription. Close the source and rewrite from memory instead.
• Cramming the night before. Cramming can work for a test minutes later, because the material is still fresh. After a delay it collapses, because nothing was spaced and little was retrieved. If the test is tomorrow, use the 48-hour plan above rather than one long night.
• Studying one topic in a single block until it feels mastered. Blocked practice feels smooth and produces high practice scores, as the Rohrer and Taylor experiment showed, but the smoothness is misleading. Mix topics once each one is understood.
• Buying a memory app and trusting the schedule. Spaced repetition software can organize reviews, but the schedule is not the learning. The learning is the recall attempt. An app that shows you answers to reread is no better than a notebook you reread.

None of this means the low-utility techniques are useless in every case. Highlighting can mark a passage to return to. A summary can organize a chapter. The claim is narrower and better supported: on their own, without retrieval and spacing, they do little for long-term recall.

FAQ

How can I memorize something fast for tomorrow?

Use retrieval practice in short spaced loops. Read the material once for understanding, close it, and write down everything you remember. Check and correct, then repeat after a few hours, then again the next morning. Cut the scope to what will actually be tested, and use a mnemonic for any list that will not stick. Do not spend the night rereading. A short review followed by sleep usually beats a late cram.

How long does it take to memorize something?

It depends on the amount of material, how well you already understand it, and how long you need to keep it. A short list can be learned in one focused session, but keeping it for a week needs at least two or three spaced recall sessions. The research does not support a fixed number of minutes per fact, so any article that promises one is guessing.

Is spaced repetition the same as rereading notes every day?

No. Rereading notes every day is repetition without a gap in difficulty: you see the answers while you study. Spaced repetition means testing yourself from memory at increasing intervals, and checking only after you try. The gap and the recall attempt are both essential.

Do flashcards actually work?

Yes, when they are used as a test rather than as notes. A card works if the front asks a question you answer from memory and the back gives the answer for checking. Cards fail when they are reread like miniature pages. Sort them so that missed cards come back sooner and known cards come back later.

What is the best memorization technique?

For most study material, the strongest evidence supports two techniques used together: retrieval practice and spaced practice. Dunlosky and colleagues rated them the only two high-utility techniques out of ten they reviewed. Mnemonics, chunking, and interleaving help with particular kinds of material, and sleep supports consolidation, but none of them replaces testing yourself across spaced sessions.

Can anyone learn to memorize faster, or is memory a talent?

Memory performance varies between people, and some of the variation comes from practice rather than talent. Trained memory athletes use the same techniques described here, especially the method of loci, and a 2021 study found that six weeks of mnemonic training improved durable memories in ordinary participants. That does not mean anyone can reach expert level in six weeks. It means the techniques are learnable skills, not fixed gifts.

How do I memorize numbers and dates?

Chunk them into groups of about four digits, attach each group to something meaningful, and test yourself on them at spaced intervals. A year can be chunked as a century and a decade, and a phone number as three groups. For long strings of digits, a memory palace with one image per group works better than repeating the digits in order.

Should I study in silence or with music?

This guide does not make a recommendation, because the research on background music and memory is mixed and depends on the task and the listener. If music distracts you during recall attempts, study in silence. The recall attempt is the part that matters, so protect it from interruption either way.

Sources & references

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