Value of 1981 Japanese Yen today

¥100 in 1981

¥134.21 in 2018

The inflation rate in Japan between 1981 and today has been 34.21%, which translates into a total increase of ¥34.21. This means that 100 yen in 1981 are equivalent to 134.21 yen in 2018. In other words, the purchasing power of ¥100 in 1981 equals ¥134.21 today. The average annual inflation rate has been 0.78%.

Inflation timeline in Japan (1981-2018)

The following chart ilustrates the equivalence of ¥100 throughout the years due to inflation and CPI changes. All values are equivalent in terms of purchashing power, which means that for each year the same goods or services could be bought with the indicated amount of money.

All calculations are performed in the local currency (JPY) and using 6 decimal digits. Results show only up to 2 decimal digits to favour readability. Inflation data is provided by governments and international institutions on a monthly basis. Today's values were obtained by estimating figures from recent trends.

The following table contains relevant indicators:

Indicator Value
Total Inflation (1981-2018) 33.16%
Total Inflation* 34.21%
Annual inflation avg. (1981-2018) 0.78%
Annual inflation avg.* 0.78%
CPI 1981 76
CPI 2018 101.2
CPI today* 102
¥1 in 1981 ¥1.33 in 2018

* Values extrapolated from the last official data to obtain today's values.

How to calculate today's value of money after inflation?

There are several ways to calculate the time value of money. Depending on the data available, results can be obtained by using the compound interest formula or the Consumer Price Index (CPI) formula.

Using the compound interest formula

Given that money changes in time as a result of an inflation rate that acts as a compound interest, the following formula can be used: FV = PV (1 + i)n, where:

  • FV: Future Value
  • PV: Present Value
  • i: Interest rate (inflation)
  • n: Number of times the interest is compounded (i.e. # of years)

In this case, the future value represents the final amount obtained after applying the inflation rate to our initial value. In other words, it indicates how much are ¥100 worth today. There are 37 years between 1981 and 2018 and the average inflation rate has been 0.7773%. Therefore, we can resolve the formula like this:

FV = PV (1 + i)n = ¥100 * (1 + 0.01)37 = ¥133.16

Using the CPI formula

When the CPI for both start and end years is known, the following formula can be used:

Final value = Initial value *
CPI final/CPI initial

In this case, the CPI in 1981 was 76 and the CPI today is 102. Therefore,

Final value = Initial value *
CPI final/CPI initial
= ¥100 *
101.2/76
= ¥133.16

Japan inflation - Conversion table

Initial Value Equivalent value
¥1 yen in 1981 ¥1.34 yen today
¥5 yen in 1981 ¥6.71 yen today
¥10 yen in 1981 ¥13.42 yen today
¥50 yen in 1981 ¥67.11 yen today
¥100 yen in 1981 ¥134.21 yen today
¥500 yen in 1981 ¥671.05 yen today
¥1,000 yen in 1981 ¥1,342.11 yen today
¥5,000 yen in 1981 ¥6,710.55 yen today
¥10,000 yen in 1981 ¥13,421.09 yen today
¥50,000 yen in 1981 ¥67,105.45 yen today
¥100,000 yen in 1981 ¥134,210.9 yen today
¥500,000 yen in 1981 ¥671,054.51 yen today
¥1,000,000 yen in 1981 ¥1,342,109.02 yen today

Value of Yen in time (by year)

Period Value
1981 100
1982 104.34
1983 106.45
1984 108.29
1985 111.18
1986 112.76
1987 112.37
1988 113.29
1989 114.47
1990 117.5
1991 121.84
1992 125.13
1993 126.58
1994 127.89
1995 128.68
1996 128.16
1997 128.95
1998 131.32
1999 132.11
2000 130.66
2001 130.13
2002 128.55
2003 128.16
2004 127.63
2005 127.89
2006 127.37
2007 127.76
2008 128.68
2009 129.21
2010 126.97
2011 126.58
2012 126.32
2013 126.05
2014 128.16
2015 131.18
2016 131.32
2017 131.71
2018 133.16
Today 134.21