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Purchasing Power Calculator - See How Inflation Erodes Your Purchasing Power

Prices have a way of increasing from year to year, so most of the stuff that we buy tends to cost more next year than it does now. Over enough years, even small annual price increases add up to cause many goods and services to become more expensive. For instance, everyone knows that a gallon of milk costs much more today than it did a few years ago.

Another way to look at increasing prices (called inflation) is that the purchasing power of your dollar decreases with time. For example, in 1950 one dollar bought a lot more stuff than its does today - a candy bar used to cost a nickel!

The purchasing power calculator lets you see how inflation affects the purchasing power of your money. Here is an example. Suppose that in 2007 you made a $200,000 salary and in 1970 you made $50,000. Which salary gave you more purchasing power?

With the purchasing power calculator you convert the $200,000 to 1970 dollars and compare the two salaries. Simply enter 200000 (no dollar sign or comma) in the Amount field. Enter 2007 in the Convert From date field and enter 1970 in the Convert To date field. Then press the Calculate button and $37,433.67 is displayed in the Dollar Value field.

So the 2007 salary, when converted to 1970 dollars, has 24.77 percent less (($37,433.67 - $50,000) / $50,000) purchasing power than you had in 1970 with the $50,000 income.

Another way to compare the two salaries is to convert the $50,000 to 2007 dollars. Enter 50000 in the Amount field. Enter 1970 in the Convert From date field and enter 2007 in the Convert To date field. The result is $267,139.18, which means that the 1970 salary expressed in 2007 dollars bought 24.77 percent more than your 2007 salary. The two approaches give the same logical result - you had more purchasing power in 1970 than you did in 2007.


Form Input

On the calculator form, enter only numbers (with or without decimal points).

Do not enter:

  • Currency symbols like dollar signs
  • Commas

Purchasing Power Calculator
Amount to Convert:
$
Convert From:
          Year
Convert To:
          Year
Dollar Value
  
   


Computational Notes:

The computations in the calculator are based on the annual Consumer Price Indices (CPI) from 1913 through 2008, which are published by the U.S. Bureau of Labor Statistics. The 2008 CPI is assumed to be the average of the October, November and December 2007 CPI values. The 2008 CPI will be updated as 2008 CPI values are released.

For the salary example, the conversion of the 2007 salary to 1970 dollars is done using the following procedure:

     2007 Salary in 1970 dollars = 2007 salary * (1970 CPI / 2007 CPI)
     2007 Salary in 1970 dollars = 200000 * (38.8 / 207.3)
     2007 Salary in 1970 dollars =$37,433.67

The conversion of the 1970 salary to 2007 dollars is done using the following procedure:

     1970 Salary in 2007 dollars = 1970 salary * (2007 CPI / 1970 CPI)
     1970 Salary in 2007 dollars = 50000 * (207.3 / 38.8)
     1970 Salary in 2007 dollars = $267,139.18


Related Articles:

Consumer Price Index and Inflation Rate Data and Cost of Living Calculators
Inflation - It Erodes Your Savings and Investments
Inflation Calculator - Save Enough to Account for Inflation
Recurring Investment Calculator - Watch Your Money Grow
Retirement Calculator - Three Easy Steps
Target Nest Egg Calculator - Getting to $1,000,000 or More


Updated March 15, 2008.


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