Inflation Calculator
Estimate future prices and lost purchasing power using a constant annual inflation assumption.
This inflation calculator helps you project what today's prices may cost in the future and how inflation reduces the real buying power of cash over time.
Calculator Inputs
Current dollar amount you want to inflation-adjust
Average annual inflation assumption
Time horizon for the estimate
Live Results
Breakdown
Inflation Changes What Money Can Actually Do
Inflation does not just make prices higher. It reduces the purchasing power of money over time, which means a cash amount that feels adequate today may buy much less in the future.
That is why inflation matters for salaries, savings targets, retirement planning, and everyday budgeting.
The Core Formula
If inflation averages 3% per year, a $1,000 expense grows to about $1,344 after 10 years. The effect compounds, so longer horizons matter much more than they appear at first glance.
Visual Example: Price Drift Over Time
Inflation compounds. Even modest annual rates create meaningful price increases across long time horizons.
Where This Is Useful
- Adjusting savings targets for future tuition, travel, or housing costs
- Pressure-testing retirement spending assumptions
- Understanding whether cash savings are keeping up with price growth
- Translating nominal dollar amounts into real purchasing power
Use Inflation With the Right Companion Tools
Future target
Pair this with the savings goal calculator if you are planning toward a target several years away.
Nominal vs real
Use the compound interest calculator to compare portfolio growth against inflation drag.
Deeper context
Read our lump sum vs monthly guide for an example of why nominal returns alone are incomplete.
Frequently Asked Questions
What does cumulative inflation mean?
It shows the total percentage increase in prices over the full period, not the yearly rate alone.
Why does purchasing power fall even if the dollar amount stays the same?
Inflation means each dollar buys fewer goods and services over time, so unchanged cash has lower real value.
Can actual inflation differ from the CPI-based estimate?
Yes. Household-specific inflation depends on what you buy most often, local pricing, and changes in housing, energy, and healthcare costs.
Primary Sources and Benchmarks
These references define the official inflation context and adjustment guidance behind the purchasing-power examples in this calculator.
- U.S. Bureau of Labor Statistics. Consumer Price Index. BLS.gov
- Federal Reserve. What is inflation and why does it matter? FederalReserve.gov
- U.S. Bureau of Labor Statistics. How to use CPI for escalation and inflation adjustment. BLS.gov
Methodology and Limits
This tool uses transparent formulas and user-provided inputs to generate planning estimates in your browser. Results are for educational use and should be validated before making legal, financial, tax, or medical decisions.
Key Assumptions
- Uses a constant annual inflation rate for the full period.
- Real-world inflation is uneven and may vary significantly by category and region.
- This is a planning estimate, not a forecast of official CPI releases.
Primary References
Last methodology review: May 17, 2026.
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