Inflation Calculator
The Inflation Calculator compares the purchasing-power value of money across dates using an entered inflation rate or supplied index values. It helps explain why the same nominal amount can buy a different amount of goods over time.
How to use this calculator
- Enter the starting amount, inflation assumption, and number of periods, or use the date/index mode if available.
- Review the worked constant-rate projection and compare its arithmetic with the inputs you plan to use.
- Change one input at a time when exploring a different scenario, and keep units and assumptions consistent.
Inflation-adjusted price
With a constant annual rate, future nominal price = starting price × (1 + rate ÷ 100)^years; actual index-based calculations use the index ratio.
- A constant-rate projection is a simplified illustration. An index-based comparison is preferable when historical inflation data are available for the relevant places and periods.
- The page's numerical output is calculated from the values entered; it does not independently verify whether those inputs fit the real-world situation.
Worked examples
Constant-rate projection
€100 is projected across three years at an assumed 3% annual inflation rate.
€100 × 1.03^3 ≈ €109.27
The projected price is about €109.27 under that constant-rate assumption.
Understanding the result
The result describes an assumption or historical index comparison, not a prediction of future inflation.
Inflation differs by country, date, and basket of goods; personal spending may not match a headline index.
Important notes
Label an assumed rate as an assumption and use official inflation indices for historical reporting.
Displayed values may be rounded for readability. Keep appropriate precision for intermediate calculations and check the unit labels before using the result.
Frequently asked questions
What does the Inflation Calculator result mean?
The result describes an assumption or historical index comparison, not a prediction of future inflation.
What should I check before using the inflation calculator?
Label an assumed rate as an assumption and use official inflation indices for historical reporting.
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Related explanations
Learn the method behind the number or compare the terminology before using the calculator.
- How to Calculate Future Value — Learn the future value formula and how growth, contributions, rates, and time affect a projected balance.
- How to Calculate Percentage Change — Learn the percentage change formula, how to calculate increases and decreases, and why the original value matters.
- Percentage Change — Learn what percentage change means, how to calculate increases and decreases, and how the original value affects the result.
This page provides a calculation tool plus explanatory information so you can understand what the result means and when the underlying method may not fit your situation.