Iran vs Tonga: Average years of schooling among adults
Iran
10.85 years
in 2023
Tonga
10.91 years
in 2023
Iran rank
73rd
Tonga rank
71st
Average years of schooling among adults over time
- Iran
- Tonga
How they compare
Tonga currently reports 10.91 years against 10.85 years in Iran, a difference of 0.06 years.
Across all 34 years both countries report, Tonga has been ahead every year.
Iran ranks 73rd and Tonga ranks 71st of 192 countries.
Tonga has averaged higher in every one of the 4 decades both report.
Head to head by decade
| Decade | Iran | Tonga | Difference | Ahead |
|---|---|---|---|---|
| 1990s | 6.99 years | 9.76 years | 2.77 years | Tonga |
| 2000s | 9.25 years | 10.16 years | 0.9141 years | Tonga |
| 2010s | 10.17 years | 10.87 years | 0.7071 years | Tonga |
| 2020s | 10.82 years | 10.91 years | 0.0869 years | Tonga |
Averages of every year both report within each decade.
Frequently asked questions
- Which has higher average years of schooling among adults, Iran or Tonga?
- Tonga, at 10.91 years against 10.85 years in Iran as of 2023.
- What is the difference in average years of schooling among adults between Iran and Tonga?
- 0.06 years, with Tonga ahead.
- How many years of comparable data are there for Iran and Tonga?
- 34 years are reported by both, from 1990 to 2023.
- How do Iran and Tonga rank globally for average years of schooling among adults?
- Iran ranks 73rd and Tonga ranks 71st of 192 countries.
- Where does this data come from?
- UNDP, Human Development Report (2025) – with minor processing by Our World in Data, published as Average years of schooling among adults. Statizoid refreshes it automatically from the source and publishes the full history for both places.
Individual pages
About this data
Average number of years (excluding years spent repeating individual grades) adults over 25 years participated in formal education.