The Thai education system: principles, organisation and school calendar

Twelve years of free basic education, nine years of compulsory schooling, fifteen years of free education if pre-school is included: the figures that shape Thai schooling overlap without always coinciding. They are the product of a long process, begun with the creation of a ministry at the end of the nineteenth century and recast by the National Education Act of 1999. This article describes the legal principles of the system, the sequence of stages according to the ‘6-3-3’ model, the division of responsibilities between the State, the educational service areas and the schools themselves, and finally the rhythm of a school year organised into two semesters.

A system built in several stages

From the ministry of 1892 to the 6-3-3 structure

Thailand's modern school administration dates back to the reign of Rama V (Chulalongkorn, 1868–1910). A ministry was created in 1892 under the name Krasuang Thammakan, usually translated as ‘Ministry of Public Instruction’, although its literal meaning refers to religious affairs. Its initial remit was broad: according to the available compilations, it covered religion, education, health and museums. The precise date often cited, 1 April 1892, has yet to be confirmed by an institutional source. The ministry took its current Thai name in 1941. It is housed in Chan Kasem Palace in Bangkok; sources differ, however, on when it moved there, some placing it as early as 1892, others in 1937.

The question of the ‘first’ national education plan calls for some clarification. An article in the Kyoto University journal Southeast Asian Studies dates the beginning of the modern education system to the reign of Rama V, with the proclamation of a first national plan. The Office of the Education Council (OEC), for its part, in its publication Education in Thailand 2017, refers to the First National Education Scheme of 1932, which formally recognised the educational capacities of every individual, regardless of sex, social background or physical condition. The documents consulted do not make it possible to determine precisely which text officially bears the title of first plan; it is partly a question of terminology.

Another milestone came in 1977. According to the OEC, the system then abandoned a 4-3-3-2 structure in favour of the 6-3-3 model: six years of primary school, three years of lower secondary and three years of upper secondary. This organisation remains in force today.

The 1999 overhaul and its aftermath

The 1997 Constitution opened a new phase by guaranteeing at least twelve years of free basic education. Two years later, in August 1999, the National Education Act was promulgated, known by its English title as the National Education Act B.E. 2542. It remains to this day the founding text governing the administration and provision of education and training. The OECD places it in the context of the economic, political, cultural and social crisis the country was going through at the time.

Implementation was spread over several years:

• 2000: creation of an Office of Educational Reform, initially set up for three years, responsible for applying the Act.
• 2002: amendment of the Act (B.E. 2545), incorporating the new administrative names resulting from the government reorganisation and specifying decentralised management within the educational service areas.
• 2003: entry into force of the Compulsory Education Act; in the same year, the Ministry of Education was given oversight of all education, from primary to post-secondary level.
• 2008: adoption of the Basic Education Core Curriculum B.E. 2551.
• 2009: launch of the fifteen-year free education programme.
• 2017: new Constitution (B.E. 2560) and national education plan covering the period 2017–2036.
• 2019: adoption of an Early Childhood Development Act B.E. 2562.

The principles: a right, an obligation, free provision

Three forms of education

The Act distinguishes three types of educational provision: formal (school and university), non-formal (programmes organised outside the conventional curriculum, notably for adults) and informal (learning drawn from experience, family and surroundings). The national report submitted by Thailand to the UNESCO Institute for Lifelong Learning presents the whole as resting on this principle of lifelong learning. This framework explains, among other things, why home education is permitted: according to the available information, still to be confirmed against the text of the law, the Constitution and the Act recognise alternative education and regard the family as a place of learning in its own right.

Twelve years free, nine years compulsory

Section 10 of the 1999 Act, as amended in 2002, grants Thai citizens an equal right to free, quality basic education for at least twelve years. According to a Thai university law review, Section 54 of the 2017 Constitution restates this obligation on the State, which must provide all children with twelve years of quality education free of charge, ‘from early childhood until the end of compulsory schooling’.

Free provision and compulsory attendance do not overlap. Section 17 of the Act requires children aged 6 to 15 to be enrolled in a basic education institution, unless they have already completed the ninth year. The OECD sums up the arrangement as follows: twelve years free, guaranteed by the Constitution, of which nine are compulsory. It adds that the 2002 amendment extended the twelve years of free education to non-Thai children resident in the country.

The exact content of these ‘twelve years’ is open to two readings. An article published by IAFOR notes that the 1997 Constitution did not define them. The most common reading equates them with years 1 to 12, that is, primary school and the whole of secondary school. Another reading includes the three years of pre-school and ends them at the close of lower secondary (year nine). The 2017 wording, as reported, appears closer to this second interpretation; only a reading of the constitutional text and its official commentaries can confirm this.

The fifteen-year programme

Since 2009, a public policy has supplemented these twelve years with three years of free pre-school. IAFOR attributes the initiative to Jurin Laksanawisit, appointed Minister of Education at the end of 2008. According to Human Rights Watch (November 2024), Thailand and Laos thus offer the greatest number of years of free education within ASEAN. The organisation specifies that this programme is a matter of government policy and is not enshrined in law. Some sources state that it also covers textbooks, supplies and uniforms; this detail has yet to be confirmed with the ministry.

Decentralisation and student-centred teaching

Beyond rights, the 1999 Act sets out broad orientations. The encyclopaedia of the international TIMSS study notes that it created new structures, decentralised educational provision and encouraged student-centred methods. The document presented by Thailand at the United Nations Universal Periodic Review (2016) describes the Act as a break with traditional practices such as lecture-style teaching and rote learning.

The structure of the stages

Schooling is organised into four main stages before higher education. The ages given below come from the TIMSS 2015 encyclopaedia:

• Pre-school (anuban, nursery school): three levels, from roughly 3 to 6 years of age.
• Primary (prathom): six levels, designated P1 to P6, from roughly 7 to 12 years of age.
• Lower secondary (‘lower’ matthayom): three levels, M1 to M3, up to 15 or 16 years of age.
• Upper secondary (‘upper’ matthayom): three levels, M4 to M6, from roughly 16 to 18 years of age, on either a general or a vocational track.
• Higher education: from 18 years of age, leading to diplomas and bachelor's degrees.

The age of entry into primary school varies between sources. The Act sets the start of compulsory schooling at 6, and the ministry places the beginning of basic education at that age. The TIMSS table places primary school between 7 and 12, while AACRAO, the American credential evaluation body, states that schooling generally begins at six or seven. The discrepancy is probably due to the difference between legal age and actual age at the start of the school year, but the sources consulted do not explain it.

The end of lower secondary (M3) marks the system's main fork in the road, since it coincides with the end of compulsory schooling. Pupils may then continue into general upper secondary education leading to university, or switch to a vocational track. The latter leads, over three years from around the age of 15, to a Vocational Certificate.

Who runs the schools?

Three tiers

Since the reform launched in 1999, educational administration has rested on three levels: the national level, the Educational Service Areas (ESAs) and the schools themselves. The country had 175 areas in 2003, then 185 in 2008. In 2017 the OEC indicated that this regional organisation had since been restructured, describing management shared between central offices, regional and provincial offices, and schools. The details of this restructuring and the current number of areas could not be verified. Local authorities may also run schools.

The main bodies

Within the ministry, the Office of the Basic Education Commission (OBEC) coordinates the implementation of government and ministry policy for primary and secondary education; it was OBEC that designed the 2008 core curriculum. In 2005, according to the journal WENR, private primary and secondary schools came under a dedicated body, the Private Education Commission.

For higher education, the organisation has changed over time. In 2003 the former Ministry of University Affairs became a Commission on Higher Education attached to the Ministry of Education. According to AACRAO, this commission oversaw public and private universities, the Rajabhat universities (which grew out of the former teacher training colleges) and the Rajamangala universities of technology. A separate ministry responsible for higher education, science, research and innovation (MHESI) now exists; its date of creation and the exact division of responsibilities between it and the Ministry of Education remain to be clarified.

Other ministries carry out specific educational missions. Physical education schools, for example, come under the Ministry of Tourism and Sports.

Some orders of magnitude

A ministry brochure published in 2008 counted more than 37,000 institutions and nearly 20 million pupils and students. These figures are more than fifteen years old and do not necessarily reflect the current situation.

What is taught: the 2008 core curriculum

The 2008 Basic Education Core Curriculum serves as a common framework for developing school curricula and for teaching. It defines eight learning areas:

• Thai language;
• mathematics;
• science;
• social studies, religion and culture;
• health and physical education;
• the arts;
• occupations and technology;
• foreign languages.

These areas are broken down into 67 standards, that is, competency objectives that pupils are expected to reach. The text is not limited to subject knowledge: it also sets out the moral values and qualities expected of pupils by the end of basic education. Grouping social studies, religion and culture within a single area extends, in a sense, the original remit of the 1892 ministry, which already combined education and religious affairs.

Teaching is delivered in Thai. English, taught as a second language in most secondary schools, has been compulsory from primary level since 1995, according to WENR.

A school year in two semesters

The principle

State schools operate on two semesters separated by a break of at least one week. The year begins with the rainy season and ends before the hottest period. According to the general descriptions available, the first semester runs from mid-May to late September or early October, and the second from late October or early November to late February or early March. Holidays total around twelve weeks a year, the longest break falling between the end of one school year and the start of the next.

Recent dates

The news outlet Expatica publishes the following dates for the coming years, which need to be confirmed by OBEC announcements:

• 2025–2026: first semester from 5 May to 9 October 2025; second semester from 1 November 2025 to 30 March 2026.
• 2026–2027: first semester from 4 May to 8 October 2026; second semester from 31 October 2026 to 29 March 2027.

These dates differ in part from the general pattern described above, particularly for the end of the second semester. They may correspond to administrative dates that include examination and closing periods, rather than teaching weeks alone; since the official calendar has not been consulted, they should be regarded as indicative.

Different calendars for different institutions

The state calendar does not apply uniformly. Some private schools begin the year in August, and a number of international schools follow the English calendar, with the year starting at the end of summer. Universities have their own calendars; the information gathered is contradictory, with the same outlet referring both to a first semester running from June to October and to frequent August start dates. Only the calendars published by each university are authoritative.

A system in flux

From the creation of a ministry in 1892 to the 1999 Act and the 2008 curriculum, the Thai education system has been built up in successive layers: a 6-3-3 structure set in 1977, a right to twelve years of free education enshrined in the Constitution since 1997, a nine-year obligation, free provision extended to pre-school since 2009 and a three-tier administration. Several projects were under way at the time of writing, notably the implementation of the 2017–2036 national plan and the proposed revision of the National Education Act mentioned by Human Rights Watch in 2024. The data presented here, current as of the dates of the sources cited, are therefore likely to change.

Sources and further reading

1. Office of the Education Council, Education in Thailand 2017 (OEC Publication No. 6/2017), Ministry of Education, Thailand, 2017.
2. Bureau of International Cooperation, An Introduction to Education in Thailand, Ministry of Education, Thailand, 2008.
3. Ministry of Education / OBEC, The Basic Education Core Curriculum B.E. 2551 (A.D. 2008), Ministry of Education, Thailand (copie hébergée par UNESCO Bangkok NEQMAP), 2008.
4. Royaume de Thaïlande, Universal Periodic Review (25th session) – document de la Thaïlande, OHCHR, 2016.
5. Southeast Asian Studies (Kyoto University), Higher Education Reform in Thailand, Kyoto University CSEAS, 2001.
6. IAFOR Journal of Politics, Economics and Law, The roles of governments in the education reform policy in Thailand, IAFOR.
7. Legal Studies on Free Basic Education, NRRU Journal (ThaiJO).
8. TIMSS & PIRLS International Study Center, TIMSS 2015 Encyclopedia – Thailand, Boston College / IEA, 2016.
9. Royaume de Thaïlande, The Development and State of the Art of Adult Learning and Education – National Report of Thailand, UNESCO Institute for Lifelong Learning, 2008.
10. OCDE, OECD Skills Strategy Thailand – Strengthening the skills of youth in initial education, OECD Publishing, 2025.
11. Robert Sedgwick, Education in Thailand (WENR), World Education Services, 2005.
12. AACRAO, EDGE – Thailand, American Association of Collegiate Registrars and Admissions Officers.
13. Human Rights Watch, Thailand: Time to Champion Free Education, Human Rights Watch, 2024.
14. Expatica, School holidays in Thailand in 2025–2026, Expatica, 2025.
15. The Thaiger, Thai school calendar: Academic year and holidays in Thailand, The Thaiger.
16. Contributeurs Wikipédia, Ministry of Education (Thailand), Wikipedia.
17. Contributeurs Wikipédia, Education in Thailand, Wikipedia.
18. Fundit, Ministry of Education (Thailand) (MOE), Fundit.
19. Kids English Thailand, Thai School Calendar 2026 (blog destiné aux enseignants), kidsenglishthailand.org, 2026.