Value of 1984 Japanese Yen today

¥100 in 1984

¥123.57 in 2018

The inflation rate in Japan between 1984 and today has been 23.57%, which translates into a total increase of ¥23.57. This means that 100 yen in 1984 are equivalent to 123.57 yen in 2018. In other words, the purchasing power of ¥100 in 1984 equals ¥123.57 today. The average annual inflation rate has been 0.61%.

Inflation timeline in Japan (1984-2018)

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 (1984-2018) 22.96%
Total Inflation* 23.57%
Annual inflation avg. (1984-2018) 0.61%
Annual inflation avg.* 0.61%
CPI 1984 82.3
CPI 2018 101.2
CPI today* 101.7
¥1 in 1984 ¥1.23 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 34 years between 1984 and 2018 and the average inflation rate has been 0.6066%. Therefore, we can resolve the formula like this:

FV = PV (1 + i)n = ¥100 * (1 + 0.01)34 = ¥122.96

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 1984 was 82.3 and the CPI today is 101.7. Therefore,

Final value = Initial value *
CPI final/CPI initial
= ¥100 *
101.2/82.3
= ¥122.96

Japan inflation - Conversion table

Initial Value Equivalent value
¥1 yen in 1984 ¥1.24 yen today
¥5 yen in 1984 ¥6.18 yen today
¥10 yen in 1984 ¥12.36 yen today
¥50 yen in 1984 ¥61.79 yen today
¥100 yen in 1984 ¥123.57 yen today
¥500 yen in 1984 ¥617.86 yen today
¥1,000 yen in 1984 ¥1,235.72 yen today
¥5,000 yen in 1984 ¥6,178.62 yen today
¥10,000 yen in 1984 ¥12,357.25 yen today
¥50,000 yen in 1984 ¥61,786.24 yen today
¥100,000 yen in 1984 ¥123,572.48 yen today
¥500,000 yen in 1984 ¥617,862.4 yen today
¥1,000,000 yen in 1984 ¥1,235,724.8 yen today

Value of Yen in time (by year)

Period Value
1984 100
1985 102.67
1986 104.13
1987 103.77
1988 104.62
1989 105.71
1990 108.51
1991 112.52
1992 115.55
1993 116.89
1994 118.1
1995 118.83
1996 118.35
1997 119.08
1998 121.26
1999 121.99
2000 120.66
2001 120.17
2002 118.71
2003 118.35
2004 117.86
2005 118.1
2006 117.62
2007 117.98
2008 118.83
2009 119.32
2010 117.25
2011 116.89
2012 116.65
2013 116.4
2014 118.35
2015 121.14
2016 121.26
2017 121.63
2018 122.96
Today 123.57