Iran vs Tonga: Theoretical duration of upper secondary education
Iran
3 years
in 2025
Tonga
3 years
in 2025
Iran rank
52nd
Tonga rank
52nd
Theoretical duration of upper secondary education over time
- Iran
- Tonga
How they compare
Iran currently reports 3 years against 3 years in Tonga, a difference of 0 years.
The two have swapped places 1 time across 56 shared years of data; in 1970 it was Iran ahead.
Iran ranks 52nd and Tonga ranks 52nd of 215 countries.
Iran has averaged higher in every one of the 6 decades both report.
Head to head by decade
| Decade | Iran | Tonga | Difference | Ahead |
|---|---|---|---|---|
| 1970s | 3.2 years | 2 years | 1.2 years | Iran |
| 1980s | 4 years | 2.6 years | 1.4 years | Iran |
| 1990s | 4 years | 2.8 years | 1.2 years | Iran |
| 2000s | 4 years | 2 years | 2 years | Iran |
| 2010s | 3.6 years | 2 years | 1.6 years | Iran |
| 2020s | 3 years | 2.5 years | 0.5 years | Iran |
Averages of every year both report within each decade.
Frequently asked questions
- Which has higher theoretical duration of upper secondary education, Iran or Tonga?
- Iran, at 3 years against 3 years in Tonga as of 2025.
- What is the difference in theoretical duration of upper secondary education between Iran and Tonga?
- 0 years, with Iran ahead.
- How many years of comparable data are there for Iran and Tonga?
- 56 years are reported by both, from 1970 to 2025.
- How do Iran and Tonga rank globally for theoretical duration of upper secondary education?
- Iran ranks 52nd and Tonga ranks 52nd of 215 countries.
- Where does this data come from?
- UNESCO Institute for Statistics, published as Theoretical duration of upper secondary education (years). Statizoid refreshes it automatically from the source and publishes the full history for both places.
Individual pages
About this data
February 2026 Data Release