# Value of 1977 US Dollars today

\$100 in 1977

\$442.32 in 2020

The inflation rate in the United States between 1977 and today has been 342.32%, which translates into a total increase of \$342.32. This means that 100 dollars in 1977 are equivalent to 442.32 dollars in 2020. In other words, the purchasing power of \$100 in 1977 equals \$442.32 today. The average annual inflation rate has been 3.44%.

## Inflation timeline in the United States (1977-2020)

The following chart depicts the equivalence of \$100 throughout the years due to inflation and CPI changes. All values are equivalent in terms of purchasing 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 (1977-2020) 341.54%
Total Inflation* 342.32%
Annual inflation avg. (1977-2020) 3.51%
Annual inflation avg.* 3.44%
CPI 1977 24.56
CPI 2020 108.42
CPI today* 108.61
\$1 in 1977 \$4.42 in 2020

* 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 with 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 43 years between 1977 and 2020 and the average inflation rate has been 3.437%. Therefore, we can resolve the formula like this:

FV = PV (1 + i)n = \$100 * (1 + 0.03)43 = \$441.54

#### 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 1977 was 24.56 and the CPI today is 108.61. Therefore,

Final value = Initial value *
CPI final/CPI initial
= \$100 *
108.42/24.56
= \$441.54

### USA inflation - Conversion table

Initial Value Equivalent value
\$1 dollar in 1977 \$4.42 dollars today
\$5 dollars in 1977 \$22.12 dollars today
\$10 dollars in 1977 \$44.23 dollars today
\$50 dollars in 1977 \$221.16 dollars today
\$100 dollars in 1977 \$442.32 dollars today
\$500 dollars in 1977 \$2,211.6 dollars today
\$1,000 dollars in 1977 \$4,423.21 dollars today
\$5,000 dollars in 1977 \$22,116.05 dollars today
\$10,000 dollars in 1977 \$44,232.1 dollars today
\$50,000 dollars in 1977 \$221,160.48 dollars today
\$100,000 dollars in 1977 \$442,320.97 dollars today
\$500,000 dollars in 1977 \$2,211,604.84 dollars today
\$1,000,000 dollars in 1977 \$4,423,209.68 dollars today

Period Value
1977 100
1978 106.7
1979 116.32
1980 131.79
1981 148.28
1982 161.51
1983 167.7
1984 174.05
1985 180.93
1986 187.8
1987 189.86
1988 198.28
1989 207.04
1990 216.67
1991 229.9
1992 236.94
1993 243.81
1994 250.52
1995 257.22
1996 263.75
1997 272.51
1998 277.15
1999 281.62
2000 289.18
2001 298.97
2002 303.61
2003 310.82
2004 316.67
2005 326.98
2006 338.14
2007 346.74
2008 360.89
2009 361.22
2010 371.05
2011 376.6
2012 387.75
2013 394.5
2014 400.43
2015 403.46
2016 406.4
2017 414.83
2018 423.58
2019 431.67
2020 441.54
Today 442.32