3000 Most Common Korean Words: How Long They Take and Which Ones Slip

A list of the 3,000 most common Korean words is a good first target: at 20 new words a day, the 2,988 words in Tomaru's deck take roughly 150 study days. The words that slip most easily are short adverbs, look-alike verbs and near-synonyms such as 요새 and 요즘, so learn those in phrases and let spaced review bring them back.

A list of the 3,000 most common Korean words is a good map. It tells you what to learn. It does not tell you which of those words will slip away a week later, or how long the whole list will take.

This article uses Tomaru's Common Korean 3000 Words deck (2,988 words) and what Tomaru's review data shows about how vocabulary sticks.

How long does the list take?

Here is how long the 2,988 words take at different paces.

More new words a day means more reviews the next day, so pick a pace you can keep up with for months rather than one you can manage for a week.

What happens after you learn a word

In Tomaru's anonymous learning data, a word you did not know the first time is remembered about 60% of the time if you review it the next day, but less than half the time if the review waits a week. In other words, the first scheduled review is where most of the progress happens.

That is why the order of the list matters less than reviewing on time. Rereading the whole list feels productive, but bringing each word back just before you would forget it keeps more words for the same time.

The kinds of words that slip

Some words on the list are harder to keep than others, for reasons you can see in the words themselves.

What to do with this

Learn the slippery words in a phrase. 눈에 띄다 (to catch the eye) is easier to keep than 띄다 alone. The same goes for 비교적 쉽다 or 감히 말하다.

Pair near-synonyms on purpose. Learn 요새 together with 요즘, and note the difference in tone, instead of meeting them weeks apart.

Expect verbs and adverbs to come back more often. If they keep returning in your reviews while nouns disappear, that is the schedule doing its job, not a sign that you are falling behind.

Do not judge yourself on the first pass. Not recalling many new words on first sight is normal. The number that matters is the next review.

You can study all 2,988 words in the Common Korean 3000 Words deck. Each review result feeds the FSRS scheduler, so the words you miss come back sooner and the ones you know wait longer.

FAQ

How many Korean words do I need to know?

There is no single number. A core list of about 3,000 common words is a practical first target for beginner and intermediate learners, before moving on to exam lists such as TOPIK II.

How long does it take to learn 3,000 Korean words?

At 20 new words per study day, the 2,988 words in the deck take roughly 150 study days. At 10 a day it is about 300.

Which Korean words are hardest to remember?

Short adverbs such as 매우 and 새로, near-synonyms such as 요새 and 요즘, and look-alike verbs such as 띄다, 뜨다 and 띠다 tend to slip more than concrete nouns, because they are hard to picture or easy to confuse.

Is it normal to forget new Korean words quickly?

Yes. What matters is the next review: in Tomaru's anonymous learning data, a word you did not know the first time is remembered about 60% of the time if you review it the next day, but less than half the time if the review waits a week.

Source: Tomaru anonymous learning data (2026).