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Theoretical duration of lower secondary education in Tonga

Tonga: Theoretical duration of lower secondary education was 4 years in 2025. ▲ Rising

Latest (2025)
4 years
Change on year
unchanged
World rank
17th
of 215 countries
All-time high
5 years
in 2012
All-time low
4 years
in 1970
Years of data
56
1970–2025

Theoretical duration of lower secondary education in Tonga, 1970–2025

012345197019972025

Source: UNESCO Institute for Statistics. Measured in years.

Analysis

Tonga recorded 4 years for theoretical duration of lower secondary education in 2025. That is the lowest value across all 56 years on record.

That represents a change of down 20.0% over ten years.

Over the whole period, theoretical duration of lower secondary education in Tonga peaked at 5 years in 2012 and was at its lowest, 4 years, in 1970.

That places Tonga 17th out of 215 countries with data for 2025, putting it in the top 10%.

The long-run direction has been consistently rising across the 56 years of available data.

Theoretical duration of lower secondary education in Tonga, year by year

Year years Change
1970 4 years —
1971 4 years +0.0%
1972 4 years +0.0%
1973 4 years +0.0%
1974 4 years +0.0%
1975 4 years +0.0%
1976 4 years +0.0%
1977 4 years +0.0%
1978 4 years +0.0%
1979 4 years +0.0%
1980 4 years +0.0%
1981 4 years +0.0%
1982 4 years +0.0%
1983 4 years +0.0%
1984 4 years +0.0%
1985 4 years +0.0%
1986 4 years +0.0%
1987 4 years +0.0%
1988 4 years +0.0%
1989 4 years +0.0%
1990 4 years +0.0%
1991 4 years +0.0%
1992 4 years +0.0%
1993 4 years +0.0%
1994 4 years +0.0%
1995 4 years +0.0%
1996 4 years +0.0%
1997 4 years +0.0%
1998 4 years +0.0%
1999 4 years +0.0%
2000 4 years +0.0%
2001 4 years +0.0%
2002 4 years +0.0%
2003 4 years +0.0%
2004 4 years +0.0%
2005 4 years +0.0%
2006 4 years +0.0%
2007 4 years +0.0%
2008 4 years +0.0%
2009 4 years +0.0%
2010 4 years +0.0%
2011 4 years +0.0%
2012 5 years +25.0%
2013 5 years +0.0%
2014 5 years +0.0%
2015 5 years +0.0%
2016 5 years +0.0%
2017 5 years +0.0%
2018 5 years +0.0%
2019 5 years +0.0%
2020 5 years +0.0%
2021 5 years +0.0%
2022 5 years +0.0%
2023 4 years -20.0%
2024 4 years +0.0%
2025 4 years +0.0%

Averages by decade

DecadeAverage LowestHighest Years
1970s 4 years 4 years 4 years 10
1980s 4 years 4 years 4 years 10
1990s 4 years 4 years 4 years 10
2000s 4 years 4 years 4 years 10
2010s 4.8 years 4 years 5 years 10
2020s 4.5 years 4 years 5 years 6

Countries ranked near Tonga

  1. 17 Albania 4 years compare
  2. 17 Andorra 4 years compare
  3. 17 United Arab Emirates 4 years compare
  4. 17 American Samoa 4 years compare
  5. 17 Australia 4 years compare
  6. 17 Austria 4 years compare
  7. 17 Benin 4 years compare
  8. 17 Burkina Faso 4 years compare
  9. 17 Bosnia and Herzegovina 4 years compare
  10. 17 Belize 4 years compare
  11. 17 Brazil 4 years compare
  12. 17 Bhutan 4 years compare
  13. 17 Central African Republic 4 years compare
  14. 17 Côte d'Ivoire 4 years compare
  15. 17 Cameroon 4 years compare
  16. 17 Congo 4 years compare
  17. 17 Colombia 4 years compare
  18. 17 Comoros 4 years compare
  19. 17 Curaçao 4 years compare
  20. 17 Czechia 4 years compare
  21. 17 Djibouti 4 years compare
  22. 17 Algeria 4 years compare
  23. 17 Ethiopia 4 years compare
  24. 17 Fiji 4 years compare
  25. 17 France 4 years compare
  26. 17 Gabon 4 years compare
  27. 17 Guinea 4 years compare
  28. 17 Guadeloupe 4 years compare
  29. 17 Equatorial Guinea 4 years compare
  30. 17 French Guiana 4 years compare
  31. 17 Croatia 4 years compare
  32. 17 Hungary 4 years compare
  33. 17 Jordan 4 years compare
  34. 17 Kuwait 4 years compare
  35. 17 Lao People's Democratic Republic 4 years compare
  36. 17 Liechtenstein 4 years compare
  37. 17 Sri Lanka 4 years compare
  38. 17 Monaco 4 years compare
  39. 17 Madagascar 4 years compare
  40. 17 Maldives 4 years compare
  41. 17 North Macedonia 4 years compare
  42. 17 Myanmar 4 years compare
  43. 17 Montenegro 4 years compare
  44. 17 Mongolia 4 years compare
  45. 17 Mauritania 4 years compare
  46. 17 Martinique 4 years compare
  47. 17 Malawi 4 years compare
  48. 17 New Caledonia 4 years compare
  49. 17 Niger 4 years compare
  50. 17 Naoero 4 years compare
  51. 17 New Zealand 4 years compare
  52. 17 Philippines 4 years compare
  53. 17 Papua New Guinea 4 years compare
  54. 17 Poland 4 years compare
  55. 17 French Polynesia 4 years compare
  56. 17 Réunion 4 years compare
  57. 17 Romania 4 years compare
  58. 17 Senegal 4 years compare
  59. 17 Somalia 4 years compare
  60. 17 Saint Pierre and Miquelon 4 years compare
  61. 17 Serbia 4 years compare
  62. 17 Suriname 4 years compare
  63. 17 Chad 4 years compare
  64. 17 Togo 4 years compare
  65. 17 Türkiye 4 years compare
  66. 17 Tuvalu 4 years compare
  67. 17 Tanzania, United Republic of 4 years compare
  68. 17 Uganda 4 years compare
  69. 17 Viet Nam 4 years compare
  70. 17 Vanuatu 4 years compare

See the full ranking of 221 places →

More education data for Tonga

All data for Tonga →

Frequently asked questions

What is theoretical duration of lower secondary education in Tonga?
Theoretical duration of lower secondary education in Tonga was 4 years in 2025, according to UNESCO Institute for Statistics.
What is the highest theoretical duration of lower secondary education recorded in Tonga?
The highest recorded value was 5 years in 2012.
What is the lowest theoretical duration of lower secondary education recorded in Tonga?
The lowest recorded value was 4 years in 1970.
How does Tonga rank for theoretical duration of lower secondary education?
Tonga ranks 17th out of 215 countries with data for 2025.
Is theoretical duration of lower secondary education rising or falling in Tonga?
Over the last ten years it is down 20.0%. The long-run trend across the full record is rising.
Where does this Tonga data come from?
The figures come from UNESCO Institute for Statistics, published as part of Theoretical duration of lower secondary education (years). Statizoid updates them automatically from the source API.

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Theoretical duration of lower secondary education in Tonga. Statizoid, drawing on UNESCO Institute for Statistics. Retrieved 24 August 2026, from https://education.statizoid.com/stat/theoretical-duration-of-lower-secondary-education-years-2/tonga/

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About this data

Indicator
Theoretical duration of lower secondary education (years)
Unit
years
Source
UNESCO Institute for Statistics
Licence
CC BY-SA 3.0 IGO (UNESCO Institute for Statistics)
Coverage
221 places, 11,823 data points, 1970–2025
Last refreshed

February 2026 Data Release