Inflation Calculator (Custom Rate)
Enter an amount, a yearly inflation rate and a number of years: see the future price, the loss of purchasing power and the cumulative change.
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| Year | Price Equivalent | Purchasing Power |
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What Will Money Be Worth?
Type any amount, a yearly inflation rate of your choice and a time span. The tool compounds the rate year by year and shows three things: the future price of something that costs the amount today, the purchasing power your amount will have left, and the cumulative inflation over the whole period. A year-by-year table lets you watch the drift.
The rate is deliberately manual — official indexes differ by country, basket and period, and past averages are no promise for the future. Plug in your own assumption (last year's official CPI, your personal basket, or a scenario) and the math is exact: value × (1+r)ⁿ. Everything runs in your browser.
Frequently Asked Questions
Why do I enter the rate myself instead of the tool fetching it?
Official CPI differs by country and basket, and the right assumption depends on your question (past average? central-bank target? worst case?). A manual rate keeps the tool honest and instant — use your national statistics office's figure if you want the official view.
What is the difference between future price and purchasing power?
Future price multiplies by (1+r)ⁿ: what today's 100 will cost later. Purchasing power divides by the same factor: what your banknote of 100 will actually buy. They are mirror images of each other.
Is the cumulative rate just rate × years?
No — inflation compounds. Ten years of 10% is not 100% but (1.10)¹⁰−1 ≈ 159%. The tool always compounds, which is why long horizons look dramatic.
Can I calculate backwards ("what was it worth in the past")?
Yes: the purchasing-power figure is exactly that — today's amount expressed in start-year buying terms. Alternatively enter the past price as the amount to project it forward to today.
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Inflation Calculator (Custom Rate)