Average class size (lower secondary) by country
United States: 21.2 in 2024, 19th of 31 OECD members (highest first). 21st of all 36 with data.
Highest: 
Japan (31.8, 2024) · Lowest: 
Latvia (17.5, 2024) · 36 countries and territories with data.
Average number of students per class in lower secondary school (public and private combined). Covers OECD members and some other countries.
Ranking
Latest value for each country (within 5 years).
Over time
United States: rank over time
Rank among the countries with data in each year (highest first).
World ranking (highest first)
| Rank | Country | Value | Year |
|---|---|---|---|
| 1 | Japan | 31.8 | 2024 |
| 2 |  Chile | 31.3 | 2024 |
| 3 |  Israel | 30.0 | 2024 |
| 4 |  Costa Rica | 28.4 | 2024 |
| 5 |  Colombia | 27.5 | 2024 |
| 6 |  France | 25.8 | 2024 |
| 7 |  South Korea | 25.6 | 2024 |
| 8 |  Mexico | 25.3 | 2024 |
| 9 |  Brazil | 25.0 | 2024 |
| 10 |  Spain | 25.0 | 2024 |
| 11 |  United Kingdom | 23.8 | 2024 |
| 12 |  Germany | 23.4 | 2024 |
| 13 |  Türkiye | 23.0 | 2024 |
| 14 |  Peru | 22.7 | 2024 |
| 15 |  Lithuania | 21.7 | 2024 |
| 16 |  Czechia | 21.7 | 2024 |
| 17 |  Sweden | 21.6 | 2024 |
| 18 |  Portugal | 21.6 | 2024 |
| 19 |  Greece | 21.5 | 2024 |
| 20 |  Austria | 21.3 | 2024 |
| 21 |  United States | 21.2 | 2024 |
| 22 |  Slovenia | 20.8 | 2024 |
| 23 |  Iceland | 20.7 | 2024 |
| 24 |  Slovakia | 20.5 | 2024 |
| 25 |  Bulgaria | 20.5 | 2024 |
| 26 |  Australia | 20.4 | 2024 |
| 27 |  Hungary | 20.3 | 2024 |
| 28 |  Romania | 20.0 | 2024 |
| 29 |  Italy | 19.9 | 2024 |
| 30 |  Estonia | 19.5 | 2024 |
| 31 |  Finland | 19.4 | 2024 |
| 32 |  Denmark | 19.3 | 2024 |
| 33 |  Luxembourg | 18.7 | 2024 |
| 34 |  Croatia | 18.2 | 2024 |
| 35 |  Poland | 17.8 | 2024 |
| 36 | Latvia | 17.5 | 2024 |
Source: OECD Data Explorer, Average class size (OECD). License: CC BY 4.0. Data retrieved: 2026-10-28.
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