Adult literacy rate, population 15+ years, adjusted gender parity in Tonga

Tonga: Adult literacy rate, population 15+ years, adjusted gender parity was 1 GPIA in 2018. ▬ Flat

Latest (2018)
1 GPIA
World rank
11th
of 87 countries
All-time high
1 GPIA
in 1996
All-time low
0.9987 GPIA
in 1976
Years of data
5
1976–2018

Adult literacy rate, population 15+ years, adjusted gender parity in Tonga, 1976–2018

00.250.50.7511976199720181976: 0.999 GPIA1996: 1 GPIA2006: 1 GPIA2011: 1 GPIA2018: 1 GPIA

Source: UNESCO Institute for Statistics. Measured in GPIA.

Analysis

In 2018, adult literacy rate, population 15+ years, adjusted gender parity in Tonga stood at 1 GPIA.

That represents a change of down 0.0% over ten years.

Over the whole period, adult literacy rate, population 15+ years, adjusted gender parity in Tonga peaked at 1 GPIA in 1996 and was at its lowest, 0.9987 GPIA, in 1976.

Tonga ranks 11th of 87 countries on this measure, in the top quarter.

Adult literacy rate, population 15+ years, adjusted gender parity in Tonga, year by year

Annual values for Adult literacy rate, population 15+ years, adjusted gender parity index (GPIA) in Tonga, 1976 to 2018.
Year GPIA Change
1976 0.9987 GPIA
1996 1 GPIA +0.3%
2006 1 GPIA -0.0%
2011 1 GPIA -0.0%
2018 1 GPIA +0.0%

Averages by decade

DecadeAverage LowestHighest Years
1970s 0.9987 GPIA 0.9987 GPIA 0.9987 GPIA 1
1990s 1 GPIA 1 GPIA 1 GPIA 1
2000s 1 GPIA 1 GPIA 1 GPIA 1
2010s 1 GPIA 1 GPIA 1 GPIA 2

Countries ranked near Tonga

  1. 8 Eswatini 1 GPIA compare
  2. 9 Venezuela, Bolivarian Republic of 1 GPIA compare
  3. 10 Honduras 1 GPIA compare
  4. 11 Argentina 1 GPIA compare
  5. 13 Philippines 1 GPIA compare
  6. 14 Grenada 1 GPIA compare

See the full ranking of 124 places →

More reference data data for Tonga

All data for Tonga →

Frequently asked questions

What is adult literacy rate, population 15+ years, adjusted gender parity in Tonga?
Adult literacy rate, population 15+ years, adjusted gender parity in Tonga was 1 GPIA in 2018, according to UNESCO Institute for Statistics.
What is the highest adult literacy rate, population 15+ years, adjusted gender parity recorded in Tonga?
The highest recorded value was 1 GPIA in 1996.
What is the lowest adult literacy rate, population 15+ years, adjusted gender parity recorded in Tonga?
The lowest recorded value was 0.9987 GPIA in 1976.
How does Tonga rank for adult literacy rate, population 15+ years, adjusted gender parity?
Tonga ranks 11th out of 87 countries with data for 2018.
Is adult literacy rate, population 15+ years, adjusted gender parity rising or falling in Tonga?
Over the last ten years it is down 0.0%. The long-run trend across the full record is flat.
Where does this Tonga data come from?
The figures come from UNESCO Institute for Statistics, published as part of Adult literacy rate, population 15+ years, adjusted gender parity index (GPIA). Statizoid updates them automatically from the source API.

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Adult literacy rate, population 15+ years, adjusted gender parity in Tonga. Statizoid, drawing on UNESCO Institute for Statistics. Retrieved 26 August 2026, from https://reference.statizoid.com/stat/adult-literacy-rate-population-15-years-adjusted-gender-parity-index-gpia/tonga/

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About this data

Indicator
Adult literacy rate, population 15+ years, adjusted gender parity index (GPIA)
Unit
GPIA
Source
UNESCO Institute for Statistics
Licence
CC BY 4.0 (World Bank Open Data)
Coverage
124 places, 2,183 data points, 1970–2019
Last refreshed

The Adjusted Gender Parity Index (GPIA) is calculated by dividing the female value for the indicator by the male value for the indicator. If the resulting value exceeds 1, the ratio is inverted and subtracted from 2. The adjusted gender parity index is symmetrical around 1 and lies in the range 0-2. An adjusted GPI equal to 1 indicates parity between females and males. In general, a value less than 1 indicates disparity in favor of males and a value greater than 1 indicates disparity in favor of females. For more information, consult the UNESCO Institute for Statistics: http://uis.unesco.org/