Mean years of schooling (ISCED 1 or higher), population 25+ years in Tonga
Tonga: Mean years of schooling (ISCED 1 or higher), population 25+ years was 1.02 GPIA in 2023. ▲ Rising
Mean years of schooling (ISCED 1 or higher), population 25+ years in Tonga, 1986–2023
Source: UNESCO Institute for Statistics. Measured in GPIA.
Analysis
Tonga recorded 1.02 GPIA for mean years of schooling (isced 1 or higher), population 25+ years in 2023. That is the highest value across all 6 years on record.
The figure is up 2.8% over ten years.
Over the whole period, mean years of schooling (isced 1 or higher), population 25+ years in Tonga peaked at 1.02 GPIA in 2023 and was at its lowest, 0.9436 GPIA, in 1986.
That places Tonga 28th out of 121 countries with data for 2023, putting it in the top quarter.
Mean years of schooling (ISCED 1 or higher), population 25+ years in Tonga, year by year
| Year | GPIA | Change |
|---|---|---|
| 1986 | 0.9436 GPIA | — |
| 1996 | 0.9757 GPIA | +3.4% |
| 2006 | 0.9766 GPIA | +0.1% |
| 2011 | 0.996 GPIA | +2.0% |
| 2019 | 1.01 GPIA | +1.7% |
| 2023 | 1.02 GPIA | +1.1% |
Averages by decade
| Decade | Average | Lowest | Highest | Years |
|---|---|---|---|---|
| 1980s | 0.9436 GPIA | 0.9436 GPIA | 0.9436 GPIA | 1 |
| 1990s | 0.9757 GPIA | 0.9757 GPIA | 0.9757 GPIA | 1 |
| 2000s | 0.9766 GPIA | 0.9766 GPIA | 0.9766 GPIA | 1 |
| 2010s | 1 GPIA | 0.996 GPIA | 1.01 GPIA | 2 |
| 2020s | 1.02 GPIA | 1.02 GPIA | 1.02 GPIA | 1 |
Countries ranked near Tonga
More education data for Tonga
- Teachers in secondary education, both sexes (number), gaps filled 1,086 (2015)
- Repeaters in primary education, all grades, both sexes (number), gaps 20 (2024)
- Enrolment in pre-primary education, male (number), gaps filled 1,228 (2024)
- Enrolment in pre-primary education, female (number), gaps filled 1,164 (2024)
- Secondary education, pupils, gaps filled 16,132 (2024)
- Primary education, duration (years), annual growth rate 0 % change on previous year (2025)
- Primary education, pupils, gaps filled 15,644 (2024)
- Primary education, pupils, annual growth rate -2.92 % change on previous year (2024)
- Primary education, pupils, per unit of GDP 0 units per US$ of GDP (2024)
- Primary education, pupils, per capita 0.1502 units per person (2024)
Frequently asked questions
- What is mean years of schooling (isced 1 or higher), population 25+ years in Tonga?
- Mean years of schooling (isced 1 or higher), population 25+ years in Tonga was 1.02 GPIA in 2023, according to UNESCO Institute for Statistics.
- What is the highest mean years of schooling (isced 1 or higher), population 25+ years recorded in Tonga?
- The highest recorded value was 1.02 GPIA in 2023.
- What is the lowest mean years of schooling (isced 1 or higher), population 25+ years recorded in Tonga?
- The lowest recorded value was 0.9436 GPIA in 1986.
- How does Tonga rank for mean years of schooling (isced 1 or higher), population 25+ years?
- Tonga ranks 28th out of 121 countries with data for 2023.
- Is mean years of schooling (isced 1 or higher), population 25+ years rising or falling in Tonga?
- Over the last ten years it is up 2.8%. The long-run trend across the full record is rising.
- Where does this Tonga data come from?
- The figures come from UNESCO Institute for Statistics, published as part of Mean years of schooling (ISCED 1 or higher), population 25+ years, adjusted gender parity index (GPIA). Statizoid updates them automatically from the source API.
Download this data
CSV · JSON — 6 observations, free to reuse under CC BY-SA 3.0 IGO (UNESCO Institute for Statistics).
About this data
February 2026 Data Release