Japanese difficulty is not spread evenly. Kana take a couple of weeks. Grammar arrives slowly but steadily. Kanji are the part that does not come for free: there are more than 2,000 jōyō characters in everyday use, each with several readings, and no amount of listening will teach you to recognise them. Vocabulary you can absorb from context; kanji you have to meet on purpose, again and again, until they hold.
That is exactly what spaced repetition is for — provided the cards match what kanji are.
One card per character is usually the wrong card
The most common beginner deck puts a character on the front and every reading on the back. Front: 生. Back: sei, shō, i(kiru), uma(reru), nama, o(u). You cannot grade yourself honestly, because you may know one reading and blank on four, and every answer becomes a guess. A card that lists five facts is not a test — it is a page.
Decide what each card tests and keep it to one thing. That means two card types, not one: word cards, where the item is a real word with its reading (生まれる umareru, 生涯 shōgai), and character cards, where you produce only the character’s most common readings. Japanese is learned as words, so word cards do most of the work; character cards exist only for the readings that words do not teach.
Direction matters too. Character to meaning trains recognition, meaning to character trains production, and character to reading is what reading a text actually demands. Test them on separate cards — production is the direction that exposes gaps, and the one most learners quietly skip.
On’yomi and kun’yomi belong on the right card
The reading split is what makes kanji feel unpredictable. The on’yomi is the Chinese-derived reading, usually used inside compounds; the kun’yomi is the native reading, usually used when the character stands as or inside a native word.
The useful rule is not “learn both readings.” It is: learn the reading the word in front of you uses, and let the pattern accumulate. 水 is sui in 水曜日 (Wednesday) but mizu when it means water on its own. Learn both as separate words and a character card later only confirms what you have already met.
Learn the parts before the whole shape
Characters are built from components, and recognising them turns rote memorisation into recognition. A few pieces recur constantly:
- 氵 water — 海 (sea), 池 (pond), 泳 (swim)
- 日 sun — 明 (bright), 時 (time), 曜 (weekday)
- 心 heart — 思 (think), 忘 (forget), 忙 (busy)
- 手 hand — 持 (hold), 打 (hit), 招 (invite)
When a new character appears, name the parts before you try to hold the whole shape. 語 (language) is 言 (speech) plus 吾; 男 (man) is 田 (field) plus 力 (strength). The shape stops being a blur of strokes and becomes a small structure you can rebuild. If you have studied Chinese, the same component logic applies to memorising hanzi with FSRS.
Size the deck to a JLPT level
Kanji, like words, come in frequency bands, and the JLPT gives you a sensible order for free. The counts are approximate and have drifted with the exam’s revisions, but they are close enough to plan with:
| JLPT level | Kanji to know, roughly |
|---|---|
| N5 | 100 |
| N4 | 300 |
| N3 | 650 |
| N2 | 1,000 |
| N1 | 2,000+ |
A single “all kanji” deck buries the characters you need under thousands you will not meet for months — the workload problem described in how to build effective flashcards. Build one deck per level, and when most of its cards are mastered, move your new-card limit to the next level.
Let FSRS decide when to review
Memorising a character once is not the goal; keeping it is. FSRS (Free Spaced Repetition Scheduler) models three things for every card — difficulty, stability and retrievability — and schedules each review for the point where your recall probability has dropped to a target level, usually around 90%. It needs roughly 20–30% fewer reviews than older SM-2 systems for the same retention.
For kanji the saving is concrete. A character you blanked should return within minutes; one you recognised instantly can wait weeks. In EnjoyCards you grade each card Again, Hard, Good or Easy, and the next interval is printed on the button — 10m, 2d, 15d — so you can see what each rating costs before you press it. New cards default to 10 a day and can be set from 1 to 100. The spaced repetition guide covers the theory behind the intervals.
When flashcards are the wrong tool for kanji
Flashcards will not teach you to read. If you never read Japanese, a deck of characters stays a set of abstract shapes, and you can pass every review while still freezing on a page. Pair the deck with reading, and turn the characters you meet in real text into cards. Writing a character by hand a few times, in the correct stroke order, also builds motor memory that a tap-through review does not, and it is worth the extra minute for the characters that keep slipping.
The other limit is honest and simple: there is no version of this where you learn 2,000 characters without meeting them many times. Spaced repetition does not remove that cost — it makes sure each meeting is spent at the moment it does the most good.
Download EnjoyCards for free and start a deck with the ten characters you keep forgetting.