Spaced Repetition: Remember Words for Good

Quick Answer: Spaced repetition means reviewing a word at growing intervals, just before you would forget it, for example after one day, three days, a week and a month. Each successful recall strengthens the memory, so you can wait longer before the next review. It helps you keep words long term with less total study time than rereading lists.

Key takeaways

• The idea rests on the spacing effect, first described by Hermann Ebbinghaus in the 1880s.
• A typical schedule is 1 day, 3 days, 1 week, 2 weeks, 1 month, then 2 to 3 months; apps vary the exact gaps.
• When you forget a card, its interval goes back to a short gap.
• Active recall is the key: try to produce the answer before you look at it.
• Daily order: finish due reviews first (5 to 15 minutes), then add 5 to 10 new cards.
• If reviews take more than 20 minutes a day, stop adding new cards for a few days.

You learn twenty new words on Monday. By Friday, you remember five. This is not because you are bad at languages. It is how human memory works. Spaced repetition is the simplest tool to fight forgetting.

Where Does the Idea Come From?

In the 1880s, the German psychologist Hermann Ebbinghaus tested his own memory of nonsense syllables and described what is now called the forgetting curve: memory fades quickly after learning, then more slowly. He also noticed that spreading practice over time worked better than repeating everything at once. This became known as the spacing effect.

Later, in the 1970s, the German science journalist Sebastian Leitner popularized a simple flashcard box system based on this idea. Today, flashcard apps such as Anki use algorithms that schedule reviews automatically.

How Does Spaced Repetition Work?

Every time you successfully remember a word, your memory of it gets stronger, so you can wait longer before the next review.

Review	Typical gap after the previous one
1st	1 day
2nd	3 days
3rd	1 week
4th	2 weeks
5th	1 month
6th	2 to 3 months

If you forget the word, the gap resets to a short one. The exact numbers vary by app; the principle is the same.

Why Does It Beat Cramming?

Cramming, or reading a list again and again in one evening, feels productive because the words seem familiar. But familiarity fades fast. Spaced review forces you to actively recall the word after some forgetting has happened, and that effort is what makes memory durable.

Compare two learners:

• Learner A reads 30 words ten times on Sunday night.
• Learner B reviews the same 30 words for five minutes on Monday, Wednesday, the next Monday and two weeks later.

Learner B spends less total time and, because of the spacing effect, is much more likely to remember the words a month later.

How Do You Make Good Flashcards?

A bad card makes spaced repetition weak. Follow these rules:

1. One idea per card. Do not put five meanings on one card.
2. Use a sentence. Front: "I'm ___ in history. (feeling curious about)" Back: "interested".
3. Test production, not just recognition. Some cards should go from your language or a picture to English.
4. Add audio or pronunciation notes. Example: comfortable is often said with three syllables, stress on the first: COMF-ter-ble (American) or COMF-ta-ble (British).
5. Keep it personal. "My brother is very stubborn." is easier to remember than a dictionary example.

Example cards

Front	Back
She ___ me a story. (past of tell)	told
make or do? ___ a mistake	make
What's the opposite of borrow?	lend
"I'll call you back." means...	I will return your phone call later

A Simple Daily System

1. Review first. Open your flashcards and finish all due cards. This should take 5 to 15 minutes.
2. Add new cards second. Add 5 to 10 new cards from today's lesson, reading or videos.
3. Use one or two words. Write or say a sentence with a word you reviewed.

If your daily reviews take more than 20 minutes, stop adding new cards for a few days. A review pile that feels heavy is the main reason people quit.

Paper Version: The Leitner Box

You need cards and five envelopes or boxes.

Box	When to review
1	Every day
2	Every 2 days
3	Every 4 days
4	Every week
5	Every 2 weeks

Correct answer: move the card up one box. Wrong answer: move it back to Box 1. That is the whole system.

What to Put in Your Deck

• High-frequency words and phrases.
• Irregular verb forms. Our irregular verbs list is a good source.
• Collocations: take a break, catch a cold, make progress.
• Useful sentences: "Could you say that again, please?"
• Your own mistakes, written correctly.

Common Mistakes

1. Skipping days. Reviews pile up quickly. Even three minutes on a busy day keeps the system alive.
2. Adding too many cards. Forty new cards a day sounds ambitious and often ends in burnout.
3. Marking "correct" too generously. If you hesitated a long time or got it half right, be honest.
4. Only using flashcards. Cards keep words alive, but you still need reading, listening and speaking. See the best way to learn English vocabulary.

Quick Practice

Which plan uses spaced repetition?

1. Review 20 words for an hour every Saturday.
2. Review 20 words today, in two days, in five days and in two weeks.
3. Write each word 50 times.

Answer: Plan 2.

Spaced Repetition Built In

LearnLingo brings words and sentences back in later lessons so you review them without managing a deck yourself. Pair it with a short daily habit, as in our guide on building a language learning habit. Start the free course today.

People Also Ask

What is spaced repetition?

Spaced repetition is a review method where you see information again at growing intervals, such as one day, three days, one week and one month. Each successful review lets you wait longer before the next one.

Does spaced repetition really work for languages?

The spacing effect, the finding that spread-out review beats cramming, is one of the most researched ideas in memory science, going back to Hermann Ebbinghaus in the 1880s. For language learners it is a very efficient way to keep vocabulary from fading.

How many flashcards should I review per day?

Keep your daily reviews to an amount you can finish in 10 to 20 minutes. If reviews pile up, add fewer new cards for a few days.

Can I do spaced repetition without an app?

Yes. The Leitner box system uses paper cards and a few boxes or envelopes. Cards move to a less frequent box when you remember them and back to the first box when you forget.

Related Reading

• The Best Way to Learn English Vocabulary
• A 15-Minute Daily English Study Routine
• Building a Language Learning Habit That Sticks
• Irregular Verbs List with Examples