What Is Juku, Exactly?
塾 (juku) is Japan's private after-school education system, and it sits alongside — not instead of — regular public or private school. Almost every Japanese family with school-age kids touches juku in some form, so foreign parents will hear the word constantly at the school gate, in group chats, and from grandparents-in-law. The confusing part is that "juku" covers several very different products at very different price points.
Broadly, juku split along two axes. By purpose: 進学塾 (shingaku-juku) are exam-prep schools built around getting into a target school, while 補習塾 (hoshuu-juku) are remedial or support schools that reinforce regular classwork. By format: 集団指導 (group instruction, cheaper, classroom-style) versus 個別指導 (kojin shidou, one-on-one or small-group tutoring, usually 1.5–2x the cost of group classes). A family's total bill depends heavily on which combination they land on, not just "juku" as one line item.
The Two Tracks That Drive Cost
Almost all juku spending in Japan funnels into one of two exam tracks. Which one (if either) your family ends up on is the single biggest driver of your education budget — bigger than whether your kids attend public or private school day-to-day (see public vs private school in Japan for how those two decisions interact).
中学受験 (Private Junior High Exam)
This is the intensive path. Families aiming for a private or elite public junior high typically enroll their child in a 大手塾 (major juku chain) around 小3–小4 (age 8–10), and the workload and cost ramp every year after that. Tuition alone climbs steadily, but the real cost driver is everything layered on top: 季節講習 (seasonal intensive courses over spring, summer, and winter break) and 模試 (mock exams) that become mandatory as the exam approaches. In the final year, 小6, all-in annual cost commonly lands in the ¥1,000,000–1,800,000 range in metro areas; the 小4–5 years typically run lower, around ¥600,000–1,300,000 per year. Regional areas outside greater Tokyo/Osaka tend to run roughly 30% lower across the board.
高校受験 (High School Exam) via Standard Juku
Most families who aren't chasing a private junior high still enroll their child in juku during the three years of 中学 (junior high) to prepare for the public or private high school entrance exam. Cost builds each year: roughly ¥170,000–270,000 in 中1, ¥250,000–350,000 in 中2, then a jump to ¥400,000–670,000 in 中3 as exam prep intensifies. Added up, ¥1,000,000 across the three years is a commonly cited round number for this track. Many of these families start juku around 中1–中2 rather than earlier.
高校受験後: Juku During High School
Once past the high school entrance exam, a smaller but still substantial share of families continue with juku through 高校 to prepare for university entrance exams (大学受験). Costs here run roughly ¥400,000–900,000 per year, with intensive courses at the top end of that range.
| Track / Stage | Typical Start | Approx. Annual Cost (Metro) |
|---|---|---|
| 中学受験 prep, 小4–小5 | 小3–小4 | ¥600,000–1,300,000 |
| 中学受験 prep, 小6 (peak) | — | ¥1,000,000–1,800,000 |
| 高校受験 juku, 中1 | 中1–中2 | ¥170,000–270,000 |
| 高校受験 juku, 中2 | — | ¥250,000–350,000 |
| 高校受験 juku, 中3 (peak) | — | ¥400,000–670,000 |
| 大学受験 / 高校 juku | 高1–高2 | ¥400,000–900,000 |
| Minimal or no juku | — | Close to ¥0 |
Why the "Average" You'll See Online Is Misleading
MEXT publishes a widely quoted 学校外活動費 (out-of-school activity spending) figure that includes juku along with sports clubs, music lessons, and more. It's an average across all families — including the many who spend nothing on juku at all, especially in early elementary. That makes it a reasonable floor for a national picture, but it understates what an actual exam-track family pays. If your child is on the 中学受験 or 高校受験 juku path, budget from the ranges above, not the headline average. For the fuller picture of education costs across ages, see our education cost breakdown by age.
Rule of thumb: if you see a low national "average" for after-school education spending, assume it's blended with families spending zero. A household actively pursuing 中学受験 or 高校受験 juku should expect costs well above that average, not near it.
When Do Families Actually Start?
Timing catches a lot of foreign parents off guard. 中学受験 families often begin serious 塾 attendance as early as 小3–小4 — years before the exam itself — because the curriculum at 大手塾 is cumulative and hard to join midstream. 高校受験 juku, by contrast, more commonly starts around 中1 or 中2, closer to the exam. If you're weighing whether your child needs juku at all, the earliest practical decision point is usually late elementary school, well before anyone in your family may feel "ready" to think about entrance exams.
The At-Home Alternative
Not every family needs or wants the cost and intensity of juku. 通信教育 (home correspondence learning) — monthly tablet or paper-based courses such as こどもちゃれんじ, 進研ゼミ, スマイルゼミ, or Z会 — typically runs about ¥2,000–8,000 per month, a fraction of juku pricing. It works well for families who want consistent structure, homework support, or light supplementation without committing to weekly commute-and-classroom juku. The honest caveat: for a serious 中学受験 push, 通信教育 is not a substitute for exam-track juku — the curriculum depth and mock-exam infrastructure aren't comparable. Z会 does offer exam-prep tiers, priced higher at roughly ¥8,000–13,500 per month, which narrows the gap somewhat but still sits well under 大手塾 juku costs. For many families, especially before 小3 or for kids not aiming at private junior high, 通信教育 alone covers the need.
Because juku costs vary so much by track, timing, and region, the right move is to model your own household's numbers rather than rely on a single national average. Check our FAQ for common questions on timing and enrollment, or use the calculator to see how different tracks affect your family's total education budget.
Among the online options, デキタス is 城南進学研究社's online course for 小中学生 (小1–中3, from ¥3,960/month) with a free trial — an at-home alternative to classroom juku (and, honestly, not a substitute for serious 中学受験 prep):
Estimate your family's cost →