Type 1 diabetes in Tonga
T1D Index estimates for 2025 · IDF Western Pacific region · Upper-Middle-Income country
An estimated 4 people are living with type 1 diabetes in Tonga in 2025. Each year about 0 people are newly diagnosed and 0 people with T1D die. A further 2 people would be alive today had they not died early from type 1 diabetes.
People living with T1D
4
New diagnoses this year
0
Deaths this year
0
Missing people
2
Expected age at death, diagnosed at 10
43.0years
How many people have type 1 diabetes in Tonga?
4 people in Tonga are living with type 1 diabetes in 2025, or 3.9 per 100,000 people. That is lower than the Western Pacific average of 43.1 per 100,000 and lower than the global average of 115.5. Tonga has the 201st-largest number of people living with T1D of the 202 countries in the T1D Index, and the 32nd-largest of the 33 countries in the IDF Western Pacific region.
For every 100 people living with T1D in Tonga, another 50 are missing: people who would be alive today had they not died early from T1D.
Is type 1 diabetes increasing in Tonga?
The number of people living with T1D in Tonga went from 1 in 2000 to 4 in 2025, and is projected to rise to 6 by 2040 (+50%).
| Year | Living with T1D | New diagnoses | Deaths | Missing people |
|---|---|---|---|---|
| 2000 | 1 | 0 | 0 | 1 |
| 2010 | 2 | 0 | 0 | 1 |
| 2020 | 3 | 0 | 0 | 2 |
| 2025 | 4 | 0 | 0 | 2 |
| 2030 (projected) | 5 | 0 | 0 | 2 |
| 2040 (projected) | 6 | 0 | 0 | 3 |
What is the life expectancy with type 1 diabetes in Tonga?
A 10-year-old diagnosed with type 1 diabetes in Tonga today is expected to live to 43.0, compared with 74.1 for a 10-year-old without T1D: 31.1 years of life lost. Counting years lived with complications as well, T1D costs 38.4 years of healthy life at today's level of care. If everyone received timely diagnosis, insulin and test strips, and insulin pumps and CGMs, that loss would fall to 14.7 years.
| Level of care | Healthy years restored | Healthy years of life | Healthy years still lost |
|---|---|---|---|
| Current level of care | – | 35.7 | 38.4 |
| + Timely diagnosis for everyone | +2.8 | 38.5 | 35.6 |
| + Insulin and test strips for everyone | +13.7 | 52.2 | 21.9 |
| + Insulin pumps and CGMs for everyone | +7.1 | 59.3 | 14.7 |
How does Tonga compare?
| 2025 | Tonga | Western Pacific | World |
|---|---|---|---|
| People living with T1D per 100,000 | 3.9 | 43.1 | 115.5 |
| New diagnoses per 100,000 | 0.3 | 2.4 | 6.2 |
| Missing people per 100 living with T1D | 50.0 | 30.7 | 43.0 |
| Expected age at death, 10-year-old with T1D | 43.0 | 56.4 | 51.3 |
| Expected age at death, 10-year-old in general population | 74.1 | 79.1 | 77.0 |
Type 1 diabetes in other Western Pacific countries
- French Polynesia14 living with T1D
- New Caledonia14 living with T1D
- Vanuatu12 living with T1D
- Samoa8 living with T1D
- Guam7 living with T1D
- Federated States of Micronesia4 living with T1D
- Kiribati4 living with T1D
More data
All figures are T1D Index version 3.0 estimates for all ages. Missing people are those who would be alive today had they not died early from type 1 diabetes. Expected age at death is for a 10-year-old. See Data & Methods for how the estimates are made and the peer-reviewed publications behind them.