Value of 1991 US Dollars today

$100 in 1991

$189 in 2018

The inflation rate in the United States between 1991 and today has been 89%, which translates into a total increase of $89. This means that 100 dollars in 1991 are equivalent to 189 dollars in 2018. In other words, the purchasing power of $100 in 1991 equals $189 today. The average annual inflation rate has been 2.3%.

Inflation timeline in the United States (1991-2018)

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 (USD) 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 (1991-2018) 84.25%
Total Inflation* 89%
Annual inflation avg. (1991-2018) 2.29%
Annual inflation avg.* 2.3%
CPI 1991 56.45
CPI 2018 104.01
CPI today* 106.7
$1 in 1991 $1.84 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 27 years between 1991 and 2018 and the average inflation rate has been 2.2996%. Therefore, we can resolve the formula like this:

FV = PV (1 + i)n = $100 * (1 + 0.02)27 = $184.25

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 1991 was 56.45 and the CPI today is 106.7. Therefore,

Final value = Initial value *
CPI final/CPI initial
= $100 *
104.01/56.45
= $184.25

USA inflation - Conversion table

Initial Value Equivalent value
$1 dollar in 1991 $1.89 dollars today
$5 dollars in 1991 $9.45 dollars today
$10 dollars in 1991 $18.9 dollars today
$50 dollars in 1991 $94.5 dollars today
$100 dollars in 1991 $189 dollars today
$500 dollars in 1991 $945.02 dollars today
$1,000 dollars in 1991 $1,890.05 dollars today
$5,000 dollars in 1991 $9,450.23 dollars today
$10,000 dollars in 1991 $18,900.46 dollars today
$50,000 dollars in 1991 $94,502.28 dollars today
$100,000 dollars in 1991 $189,004.56 dollars today
$500,000 dollars in 1991 $945,022.78 dollars today
$1,000,000 dollars in 1991 $1,890,045.55 dollars today

Value of Dollar in time (by year)

Period Value
1991 100
1992 103.06
1993 106.05
1994 108.97
1995 111.88
1996 114.72
1997 118.54
1998 120.55
1999 122.5
2000 125.78
2001 130.04
2002 132.06
2003 135.2
2004 137.74
2005 142.23
2006 147.09
2007 150.82
2008 156.98
2009 157.12
2010 161.4
2011 163.81
2012 168.66
2013 171.6
2014 174.18
2015 175.49
2016 176.78
2017 180.44
2018 184.25
Today 189