How the inflation estimate works
The future equivalent cost compounds the entered annual rate for the selected number of years. Remaining purchasing power discounts the starting amount by the same factor. For example, if prices rise, the same number of dollars buys less even though the printed dollar amount has not changed.
This is a scenario, not a CPI lookup
The calculator does not download historical or forecast inflation data. It applies one rate that you choose. Actual inflation changes over time, and a household’s experience can differ from a broad consumer price index because spending patterns, location, housing, health care, education, and energy costs differ.
Future cost and present value answer opposite questions
Future cost estimates how many future dollars would purchase what the starting amount purchases today. Remaining purchasing power estimates what the unchanged starting dollar amount would be worth in today’s buying power after the modeled price increase. They use the same compounding factor in opposite directions.
Deflation can also be modeled
A negative rate models falling prices, subject to the input range. Sustained deflation is not simply “good inflation”: it can interact with wages, debt burdens, demand, and interest rates. Use negative scenarios for sensitivity testing rather than as a general economic forecast.
Use a range for long-term decisions
Small differences in annual inflation compound into large differences over decades. Test lower, middle, and higher assumptions when comparing retirement spending, future income, or investment returns. Keep nominal and inflation-adjusted figures clearly labeled so they are not mixed in one plan.
This calculator provides general educational arithmetic, not economic, investment, financial, tax, or legal advice. It does not reproduce an official price index or predict future inflation.