Inflation Rate
The Inflation Rate Calculator helps you understand how purchasing power changes over time. Enter a dollar amount from a past year and see what it is worth today — or project future values given an expected inflation rate. Whether comparing historical salaries, planning retirement savings, or understanding how inflation erodes fixed income, this tool makes the math clear and immediate.
| Year | Rate |
|---|---|
About the Inflation Rate Calculator
The Inflation Rate Calculator helps you understand how purchasing power changes over time. Enter a dollar amount from a past year and see what it is worth today — or project future values given an expected inflation rate. Whether comparing historical salaries, planning retirement savings, or understanding how inflation erodes fixed income, this tool makes the math clear and immediate.
How to use it
- Enter the original amount and the starting year.
- Select the ending year or use today's date.
- Choose the inflation index (CPI, PCE, or custom rate).
- Review the inflation-adjusted equivalent and the percent change.
Formula & methodology
Adjusted value = original * (CPI_end / CPI_start). Inflation rate = ((CPI_end - CPI_start) / CPI_start) * 100. Purchasing power loss = original - adjusted value. Rule of 70: years to halve purchasing power = 70 / annual inflation rate.
Common use cases
- Comparing historical salaries to today's equivalent
- Understanding how retirement savings must grow to outpace inflation
- Evaluating whether investment returns beat inflation (real return)
- Historical research: understanding prices in past decades
- Business planning: adjusting revenue projections for inflation
Frequently asked questions
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