Iran vs Tonga: Average years of schooling vs. expected years of schooling

Iran

10.85 years

in 2023

Tonga

10.91 years

in 2023

Iran rank

73rd

Tonga rank

71st

Average years of schooling vs. expected years of schooling over time

Tonga currently reports 10.91 years against 10.85 years in Iran, a difference of 0.0682 years.

Across all 34 years both countries report, Tonga has been ahead every year.

Iran ranks 73rd and Tonga ranks 71st of 192 countries.

Indicator: Average years of schooling vs. expected years of schooling
Unit: years
Source: UNDP, Human Development Report (2025) – with minor processing by Our World in Data
Licence: CC BY 4.0 (Our World in Data)
Coverage: 192 places, 6,079 data points, 1990–2023
Last refreshed: 07 August 2026

Average number of years (excluding years spent repeating individual grades) adults over 25 years participated in formal education.