Human Development & Quality of Life in Tonga
Human Development
UNDP places Tonga at rank 92 with a 2023 HDI of 0.769, a high human development result. Two details sharpen that picture. The income component uses GNI per capita of $7,438 in 2021 PPP dollars. Gender development sits close to parity on the GDI measure at 0.998 (UNDP group 1).
What sits inside Tonga's HDI
Tonga's HDI can be read through four underlying inputs for 2023: 72.9 life expectancy, 17.8 expected schooling, 10.9 mean schooling and GNI per capita of $7,438 in 2021 PPP dollars. The components are inputs to HDI, not independent country league tables. When the indicator is reused, keep missing fields explicitly missing before using the result as a shorthand for lived experience.
Inequality changes the headline
For Tonga, IHDI asks how the HDI changes once unequal achievement across people is considered, the adjustment is about distribution rather than subjective well-being.
Gender and planetary-pressure adjustments
For Tonga, the available complementary indices are GDI 0.998, GII 0.444. They complement one another, but none is treated as a substitute for another.
Quality-of-life coverage is conditional
For Tonga, the page has no verified OECD life-satisfaction observation to report. Missing source coverage is shown as a limitation, not filled with an estimate.
What Tonga's numbers say together
For the evidence shown here, the complementary evidence for Tonga includes IHDI 0.682 with a 11.3% loss; GDI 0.998. They complement one another, but none is treated as a substitute for another.
HDI for Tonga stands at 0.769 in 2023, with UNDP rank 92. It is a development benchmark based on three dimensions, not an all-purpose national score.
The IHDI is 0.682, and UNDP reports an overall loss of 11.3% relative to the headline index.
The GDI value is 0.998 in group 1; it should be read alongside, not merged into, HDI.
Frequently asked questions
What is Tonga's HDI?
UNDP's Human Development Report 2025 gives Tonga an HDI of 0.769 for 2023 and rank 92.
How does inequality affect Tonga's HDI?
UNDP reports IHDI 0.682 for Tonga, which is 11.3% below the headline HDI after inequality across the three dimensions is taken into account.
Why is there no life satisfaction score on this page?
This profile does not fill the quality-of-life section for Tonga simply to complete the layout. Missing source coverage is shown as a limitation, not filled with an estimate.
Is HDI the same as quality of life?
No. The HDI calculation does not include every aspect of quality of life. A life-satisfaction result is not an input to HDI and remains a separate quality-of-life signal.
Sources & methodology
Sources for the development indicators and definitions shown above.
View sources used for this page
Primary source for 2023 HDI and its components, plus IHDI, GDI, GII and PHDI where reported.
Report edition underlying the 2023 human-development indices and ranking.
Data note: Reference years are shown with each indicator; unavailable observations remain unfilled.