What is secondary education, duration in OECD members?

Secondary education, duration in OECD members was 6 years in 2025, according to Data API, UN Educational, Scientific and Cultural Organization (UNESCO).

What is the highest secondary education, duration recorded in OECD members?

The highest recorded value was 6 years in 1970.

What is the lowest secondary education, duration recorded in OECD members?

The lowest recorded value was 6 years in 1970.

Is secondary education, duration rising or falling in OECD members?

Over the last ten years it is unchanged. The long-run trend across the full record is flat.

Where does this OECD members data come from?

The figures come from Data API, UN Educational, Scientific and Cultural Organization (UNESCO), published as part of Secondary education, duration (years). Statizoid updates them automatically from the source API.

Secondary education, duration in OECD members

Name: Secondary education, duration in OECD members
Creator: Data API, UN Educational, Scientific and Cultural Organization (UNESCO)
License: CC BY 4.0 (World Bank Open Data)

OECD members: Secondary education, duration was 6 years in 2025. ▬ Flat

Latest (2025)

6 years

Change on year

unchanged

All-time high

6 years

in 1970

All-time low

6 years

in 1970

Years of data

1970–2025

Secondary education, duration in OECD members, 1970–2025

Source: Data API, UN Educational, Scientific and Cultural Organization (UNESCO). Measured in years.

Analysis

In 2025, secondary education, duration in OECD members stood at 6 years. That is the highest value across all 56 years on record.

The figure is unchanged over ten years.

Over the whole period, secondary education, duration in OECD members peaked at 6 years in 1970 and was at its lowest, 6 years, in 1970.

Averages by decade

Decade	Average	Lowest	Highest	Years
1970s	6 years	6 years	6 years	10
1980s	6 years	6 years	6 years	10
1990s	6 years	6 years	6 years	10
2000s	6 years	6 years	6 years	10
2010s	6 years	6 years	6 years	10
2020s	6 years	6 years	6 years	6

More education data for OECD members

Population ages 15-64 64.5% (2025)
Population ages 0-14 16.4% (2025)
School enrollment, primary 100.7% (2024)
Primary education, teachers 6.28 million (2024)
School enrollment, primary, female 100.4% (2024)
School enrollment, primary, male 100.9% (2024)
Labor force, female 44.8% (2025)
Labor force, total 709.91 million (2025)
School enrollment, primary (gross), gender parity index 0.9973 GPI (2020)
School enrollment, secondary 105.4% (2024)

All data for OECD members →

Frequently asked questions

What is secondary education, duration in OECD members?: Secondary education, duration in OECD members was 6 years in 2025, according to Data API, UN Educational, Scientific and Cultural Organization (UNESCO).
What is the highest secondary education, duration recorded in OECD members?: The highest recorded value was 6 years in 1970.
What is the lowest secondary education, duration recorded in OECD members?: The lowest recorded value was 6 years in 1970.
Is secondary education, duration rising or falling in OECD members?: Over the last ten years it is unchanged. The long-run trend across the full record is flat.
Where does this OECD members data come from?: The figures come from Data API, UN Educational, Scientific and Cultural Organization (UNESCO), published as part of Secondary education, duration (years). Statizoid updates them automatically from the source API.

Download this data

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About this data

Indicator: Secondary education, duration (years)
Unit: years
Source: Data API, UN Educational, Scientific and Cultural Organization (UNESCO)
Licence: CC BY 4.0 (World Bank Open Data)
Coverage: 255 places, 13,986 data points, 1970–2025
Last refreshed: 06 August 2026

Secondary duration refers to the number of grades (years) in secondary school.