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Theoretical duration of upper secondary education in Tonga

Tonga: Theoretical duration of upper secondary education was 3 years in 2025. ▬ Flat

Latest (2025)
3 years
Change on year
unchanged
World rank
52nd
of 215 countries
All-time high
3 years
in 1984
All-time low
2 years
in 1970
Years of data
56
1970–2025

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

0123197019972025

Source: UNESCO Institute for Statistics. Measured in years.

Analysis

In 2025, theoretical duration of upper secondary education in Tonga stood at 3 years. That is the highest value across all 56 years on record.

That represents a change of up 50.0% over ten years.

Over the whole period, theoretical duration of upper secondary education in Tonga peaked at 3 years in 1984 and was at its lowest, 2 years, in 1970.

That places Tonga 52nd out of 215 countries with data for 2025, putting it in the top quarter.

Averages by decade

DecadeAverage LowestHighest Years
1970s 2 years 2 years 2 years 10
1980s 2.6 years 2 years 3 years 10
1990s 2.8 years 2 years 3 years 10
2000s 2 years 2 years 2 years 10
2010s 2 years 2 years 2 years 10
2020s 2.5 years 2 years 3 years 6

Countries ranked near Tonga

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  23. 52 Germany 3 years compare
  24. 52 Djibouti 3 years compare
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  27. 52 Algeria 3 years compare
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See the full ranking of 221 places →

More education data for Tonga

All data for Tonga →

Frequently asked questions

What is theoretical duration of upper secondary education in Tonga?
Theoretical duration of upper secondary education in Tonga was 3 years in 2025, according to UNESCO Institute for Statistics.
What is the highest theoretical duration of upper secondary education recorded in Tonga?
The highest recorded value was 3 years in 1984.
What is the lowest theoretical duration of upper secondary education recorded in Tonga?
The lowest recorded value was 2 years in 1970.
How does Tonga rank for theoretical duration of upper secondary education?
Tonga ranks 52nd out of 215 countries with data for 2025.
Is theoretical duration of upper secondary education rising or falling in Tonga?
Over the last ten years it is up 50.0%. The long-run trend across the full record is flat.
Where does this Tonga data come from?
The figures come from UNESCO Institute for Statistics, published as part of Theoretical duration of upper secondary education (years). Statizoid updates them automatically from the source API.

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Theoretical duration of upper secondary education in Tonga. Statizoid, drawing on UNESCO Institute for Statistics. Retrieved 21 August 2026, from https://education.statizoid.com/stat/theoretical-duration-of-upper-secondary-education-years-2/tonga/

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About this data

Indicator
Theoretical duration of upper 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