What is the difference in theoretical duration of upper secondary education between Iran, Islamic Republic of and Türkiye?

0 years, with Iran, Islamic Republic of ahead.

How many years of comparable data are there for Iran, Islamic Republic of and Türkiye?

51 years are reported by both, from 1970 to 2020.

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.

Iran, Islamic Republic of vs Türkiye: Theoretical duration of upper secondary education

Iran, Islamic Republic of

4 years

in 2020

Türkiye

4 years

in 2020

Iran, Islamic Republic of rank

5th

Türkiye rank

5th

Theoretical duration of upper secondary education over time

Iran, Islamic Republic of
Türkiye

How they compare

Iran, Islamic Republic of currently reports 4 years against 4 years in Türkiye, a difference of 0 years.

The two have swapped places 2 times across 51 shared years of data; in 1970 it was Türkiye ahead.

Iran, Islamic Republic of ranks 5th and Türkiye ranks 5th of 209 countries.

Across the 6 decades both report, Iran, Islamic Republic of averaged higher in 4 and Türkiye in 1.

Head to head by decade

Decade	Iran, Islamic Republic of	Türkiye	Difference	Ahead
1970s	3.2 years	3 years	0.2 years	Iran, Islamic Republic of
1980s	4 years	3 years	1 years	Iran, Islamic Republic of
1990s	4 years	3 years	1 years	Iran, Islamic Republic of
2000s	4 years	3.1 years	0.9 years	Iran, Islamic Republic of
2010s	3.6 years	4 years	0.4 years	Türkiye
2020s	4 years	4 years	0 years	—

Averages of every year both report within each decade.

Frequently asked questions

Which has higher theoretical duration of upper secondary education, Iran, Islamic Republic of or Türkiye?: Iran, Islamic Republic of, at 4 years against 4 years in Türkiye as of 2020.
What is the difference in theoretical duration of upper secondary education between Iran, Islamic Republic of and Türkiye?: 0 years, with Iran, Islamic Republic of ahead.
How many years of comparable data are there for Iran, Islamic Republic of and Türkiye?: 51 years are reported by both, from 1970 to 2020.
How do Iran, Islamic Republic of and Türkiye rank globally for theoretical duration of upper secondary education?: Iran, Islamic Republic of ranks 5th and Türkiye ranks 5th of 209 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.

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Iran, Islamic Republic of vs Türkiye: Theoretical duration of upper secondary education. Statizoid, drawing on UNESCO Institute for Statistics. Retrieved 03 September 2026, from https://education.statizoid.com/compare/theoretical-duration-of-upper-secondary-education-years/iran-islamic-rep/turkiye/

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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 4.0 (World Bank Open Data)
Coverage: 209 places, 10,366 data points, 1970–2020
Last refreshed: 21 August 2026

Number of grades (years) in upper secondary education.