What is Purchasing Power?
Purchasing power measures the value of currency expressed in terms of the amount of goods or services that one unit of money can buy. Inflation reduces purchasing power over time.
How the Calculator Works
This calculator uses the Consumer Price Index (CPI) to adjust dollar amounts for inflation between two years:
- CPI (Consumer Price Index): Tracks the average change in prices paid by consumers for a basket of goods and services
- Base Period: 1982-1984 = 100
- Formula:
Adjusted Value = Amount × (CPI End Year / CPI Start Year)
Example
If $100 in 2000 is equivalent to $150.33 in 2020, this means:
- Prices have increased by 50.33% over 20 years
- You need $150.33 in 2020 to buy what $100 could buy in 2000
- The average annual inflation rate was approximately 2.06%
Use Cases
- Compare salaries or prices across different time periods
- Understand the real value of historical investments
- Adjust contract values for inflation clauses
- Evaluate purchasing power erosion over time