T1D Index estimates for 2025 · IDF Western Pacific region · High-Income country
An estimated 81,792 people are living with type 1 diabetes in Japan in 2025. Each year about 3,453 people are newly diagnosed and 731 people with T1D die. A further 14,518 people would be alive today had they not died early from type 1 diabetes.
People living with T1D
81,792
New diagnoses this year
3,453
Deaths this year
731
Missing people
14,518
Expected age at death, diagnosed at 10
73.2years
How many people have type 1 diabetes in Japan?
81,792 people in Japan are living with type 1 diabetes in 2025, or 66.5 per 100,000 people. That is higher than the Western Pacific average of 43.1 per 100,000 and lower than the global average of 115.5. Japan has the 26th-largest number of people living with T1D of the 202 countries in the T1D Index, and the 3rd-largest of the 33 countries in the IDF Western Pacific region.
For every 100 people living with T1D in Japan, another 18 are missing: people who would be alive today had they not died early from T1D.
Is type 1 diabetes increasing in Japan?
The number of people living with T1D in Japan went from 31,582 in 2000 to 81,792 in 2025, and is projected to rise to 114,362 by 2040 (+40%).
People living with type 1 diabetes in Japan, 2000–2040. Solid line: modelled estimates to 2025; dashed line: projection to 2040.
Type 1 diabetes in Japan over time, all ages
Year
Living with T1D
New diagnoses
Deaths
Missing people
2000
31,582
1,895
420
7,397
2010
49,126
2,644
456
9,600
2020
70,675
3,219
637
12,769
2025
81,792
3,453
731
14,518
2030 (projected)
93,600
3,989
1,088
16,637
2040 (projected)
114,362
3,668
1,252
21,936
What is the life expectancy with type 1 diabetes in Japan?
A 10-year-old diagnosed with type 1 diabetes in Japan today is expected to live to 73.2, compared with 85.2 for a 10-year-old without T1D: 12.0 years of life lost. Counting years lived with complications as well, T1D costs 24.9 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 14.2 years.
Healthy years of life for a 10-year-old diagnosed with T1D in Japan, as each level of care is added in turn
Level of care
Healthy years restored
Healthy years of life
Healthy years still lost
Current level of care
–
60.3
24.9
+ Timely diagnosis for everyone
–
60.3
24.9
+ Insulin and test strips for everyone
+3.1
63.4
21.8
+ Insulin pumps and CGMs for everyone
+7.6
71.0
14.2
How does Japan compare?
Type 1 diabetes in Japan compared with the Western Pacific region and the world, 2025
2025
Japan
Western Pacific
World
People living with T1D per 100,000
66.5
43.1
115.5
New diagnoses per 100,000
2.8
2.4
6.2
Missing people per 100 living with T1D
17.7
30.7
43.0
Expected age at death, 10-year-old with T1D
73.2
56.4
51.3
Expected age at death, 10-year-old in general population
85.2
79.1
77.0
Type 1 diabetes in other Western Pacific countries
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.
