Result: ¥100 in 2005 → ¥102.01 in 2026
Value of ¥100 from 2005 to 2026
Updated: December 18, 2025¥100 in 2005 is equivalent in purchasing power to about ¥102.01 today, an increase of ¥2.01 over 21 years. The yen had an average inflation rate of 0.09% per year between 2005 and today, producing a cumulative price increase of 2.01%.
This means that today's prices are 1.02 times as high as average prices since 2005, according to the OECD and the World Bank consumer price index for Japan. A yen today only buys 98.030% of what it could buy back then.
The inflation rate in 2005 was -0.29%. The current inflation rate compared to the end of last year is now -0.40%. If this number holds, ¥100 today will be equivalent in buying power to ¥99.60 next year.
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| Cumulative price change | 2.01% |
| Average inflation rate | 0.09% |
| Converted amount ¥100 base | ¥102.01 |
| Price difference ¥100 base | ¥2.01 |
| CPI in 2005 | 96.937 |
| CPI in 2026 | 98.889 |
| Inflation in 2005 | -0.29% |
| Inflation in 2026 | -0.40% |
| ¥100 in 2005 | ¥102.01 in 2026 |
Buying power of ¥100 in 2005
This chart shows a calculation of buying power equivalence for ¥100 in 2005 (price index tracking began in 1955).
For example, if you started with ¥100, you would need to end with ¥102.01 in order to "adjust" for inflation (sometimes refered to as "beating inflation").
When ¥100 is equivalent to ¥102.01 over time, that means that the "real value" of a single Japanese yen decreases over time. In other words, a yen will pay for fewer items at the store.
This effect explains how inflation erodes the value of a yen over time. By calculating the value in 2005 dollars, the chart below shows how ¥100 is worth less over 21 years.
According to the OECD and the World Bank, each of these JPY amounts below is equal in terms of what it could buy at the time:
This conversion table shows various other 2005 amounts in today's yen, based on the 2.01% change in prices:
| Initial value | Equivalent value |
|---|---|
| ¥1 yen in 2005 | ¥1.02 yen today |
| ¥5 yen in 2005 | ¥5.10 yen today |
| ¥10 yen in 2005 | ¥10.20 yen today |
| ¥50 yen in 2005 | ¥51.01 yen today |
| ¥100 yen in 2005 | ¥102.01 yen today |
| ¥500 yen in 2005 | ¥510.07 yen today |
| ¥1,000 yen in 2005 | ¥1,020.14 yen today |
| ¥5,000 yen in 2005 | ¥5,100.68 yen today |
| ¥10,000 yen in 2005 | ¥10,201.36 yen today |
| ¥50,000 yen in 2005 | ¥51,006.79 yen today |
| ¥100,000 yen in 2005 | ¥102,013.59 yen today |
| ¥500,000 yen in 2005 | ¥510,067.94 yen today |
| ¥1,000,000 yen in 2005 | ¥1,020,135.87 yen today |
How to calculate inflation rate for ¥100 since 2005
Our calculations use the following inflation rate formula to calculate the change in value between 2005 and today:
CPI today CPI in 2005
×
2005 JPY value
=
Today's value
Then plug in historical CPI values. The Japanese CPI was 96.9373 in the year 2005 and 98.88921722067573 in 2026:
98.8892172206757396.9373
×
¥100
=
¥102.01
¥100 in 2005 has the same "purchasing power" or "buying power" as ¥102.01 in 2026.
To get the total inflation rate for the 21 years between 2005 and 2026, we use the following formula:
CPI in 2026 - CPI in 2005CPI in 2005
×
100
=
Cumulative inflation rate (21 years)
Plugging in the values to this equation, we get:
98.88921722067573 - 96.937396.9373
×
100
=
2%
Data source & citation
You may use the following MLA citation for this page: “¥100 in 2005 → 2026 | Japan Inflation Calculator.” Official Inflation Data, Alioth Finance, 7 Jan. 2026, https://www.officialdata.org/japan/inflation/2005?amount=100.
Special thanks to QuickChart for their chart image API, which is used for chart downloads.
in2013dollars.com is a reference website maintained by the Official Data Foundation.
| Cumulative price change | 2.01% |
| Average inflation rate | 0.09% |
| Converted amount ¥100 base | ¥102.01 |
| Price difference ¥100 base | ¥2.01 |
| CPI in 2005 | 96.937 |
| CPI in 2026 | 98.889 |
| Inflation in 2005 | -0.29% |
| Inflation in 2026 | -0.40% |
| ¥100 in 2005 | ¥102.01 in 2026 |