Lower secondary school completion rates, adjusted gender parity index in Tonga
Tonga: Lower secondary school completion rates, adjusted gender parity index was 1.11 index in 2025. ▲ Rising
Lower secondary school completion rates, adjusted gender parity index in Tonga, 1981–2025
Source: UNESCO Institute for Statistics (2026) – with minor processing by Our World in Data. Measured in index.
Analysis
Tonga recorded 1.11 index for lower secondary school completion rates, adjusted gender parity index in 2025.
Compared with earlier readings it is down 0.2% on the previous year and down 0.8% over ten years.
Over the whole period, lower secondary school completion rates, adjusted gender parity index in Tonga peaked at 1.12 index in 2008 and was at its lowest, 1.02 index, in 1981.
That places Tonga 37th out of 164 countries with data for 2025, putting it in the top quarter.
The long-run direction has been consistently rising across the 45 years of available data.
Lower secondary school completion rates, adjusted gender parity index in Tonga, year by year
| Year | index | Change |
|---|---|---|
| 1981 | 1.02 index | — |
| 1982 | 1.03 index | +0.6% |
| 1983 | 1.03 index | +0.5% |
| 1984 | 1.04 index | +1.0% |
| 1985 | 1.05 index | +0.6% |
| 1986 | 1.05 index | +0.5% |
| 1987 | 1.06 index | +0.4% |
| 1988 | 1.06 index | +0.4% |
| 1989 | 1.07 index | +0.6% |
| 1990 | 1.07 index | +0.0% |
| 1991 | 1.08 index | +0.5% |
| 1992 | 1.08 index | +0.2% |
| 1993 | 1.08 index | +0.2% |
| 1994 | 1.08 index | +0.4% |
| 1995 | 1.09 index | +0.2% |
| 1996 | 1.09 index | +0.3% |
| 1997 | 1.09 index | +0.3% |
| 1998 | 1.1 index | +0.2% |
| 1999 | 1.1 index | +0.1% |
| 2000 | 1.1 index | +0.3% |
| 2001 | 1.1 index | +0.3% |
| 2002 | 1.11 index | +0.4% |
| 2003 | 1.11 index | +0.0% |
| 2004 | 1.11 index | +0.2% |
| 2005 | 1.11 index | +0.3% |
| 2006 | 1.12 index | +0.2% |
| 2007 | 1.12 index | +0.2% |
| 2008 | 1.12 index | +0.1% |
| 2009 | 1.12 index | -0.0% |
| 2010 | 1.12 index | -0.0% |
| 2011 | 1.12 index | +0.0% |
| 2012 | 1.12 index | -0.1% |
| 2013 | 1.12 index | -0.0% |
| 2014 | 1.12 index | -0.1% |
| 2015 | 1.12 index | +0.1% |
| 2016 | 1.12 index | +0.0% |
| 2017 | 1.12 index | -0.1% |
| 2018 | 1.12 index | -0.1% |
| 2019 | 1.11 index | -0.2% |
| 2020 | 1.11 index | -0.1% |
| 2021 | 1.11 index | -0.1% |
| 2022 | 1.11 index | +0.0% |
| 2023 | 1.11 index | +0.0% |
| 2024 | 1.11 index | -0.1% |
| 2025 | 1.11 index | -0.2% |
Tonga compared with similar countries
- Tonga's 1.11 index is above the median for upper middle income countries, which is 1.03 index, 1.1× the median. (50 countries reporting)
- Tonga's 1.11 index is above the median for East Asia & Pacific, which is 1.07 index, 1.0× the median. (21 countries reporting)
Averages by decade
| Decade | Average | Lowest | Highest | Years |
|---|---|---|---|---|
| 1980s | 1.05 index | 1.02 index | 1.07 index | 9 |
| 1990s | 1.08 index | 1.07 index | 1.1 index | 10 |
| 2000s | 1.11 index | 1.1 index | 1.12 index | 10 |
| 2010s | 1.12 index | 1.11 index | 1.12 index | 10 |
| 2020s | 1.11 index | 1.11 index | 1.11 index | 6 |
Countries ranked near Tonga
More gender data for Tonga
- Child population (UN estimates and projections) 32.72 (2030)
- Child population (UN estimates and projections) (0-14), annual growth -2.04 % change on previous year (2030)
- Population 69.36 (2030)
- Working-age population (UN estimates and projections) 69.36 (2030)
- Population (UN estimates and projections), annual growth rate 0.6867 % change on previous year (2030)
- Age population, age 00, female, interpolated 1,112 (2025)
- Age population, age 00, male, interpolated 1,200 (2025)
- Age population, age 01, female, interpolated 1,106 (2025)
- Age population, age 01, male, interpolated 1,195 (2025)
- Age population, age 02, female, interpolated 1,110 (2025)
Frequently asked questions
- What is lower secondary school completion rates, adjusted gender parity index in Tonga?
- Lower secondary school completion rates, adjusted gender parity index in Tonga was 1.11 index in 2025, according to UNESCO Institute for Statistics (2026) – with minor processing by Our World in Data.
- What is the highest lower secondary school completion rates, adjusted gender parity index recorded in Tonga?
- The highest recorded value was 1.12 index in 2008.
- What is the lowest lower secondary school completion rates, adjusted gender parity index recorded in Tonga?
- The lowest recorded value was 1.02 index in 1981.
- How does Tonga rank for lower secondary school completion rates, adjusted gender parity index?
- Tonga ranks 37th out of 164 countries with data for 2025.
- Is lower secondary school completion rates, adjusted gender parity index rising or falling in Tonga?
- Over the last ten years it is down 0.8%. 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 (2026) – with minor processing by Our World in Data, published as part of Lower secondary school completion rates, adjusted gender parity index. Statizoid updates them automatically from the source API.
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About this data
An adjusted gender parity index of 1 indicates equal lower secondary school completion rates between boys and girls. Values below 1 favor boys, and values above 1 favor girls.