Free Inflation Calculator Spreadsheet Template
Calculate the impact of inflation on purchasing power over time. See how a given amount today compares to its future or past value.
What's Included
- Calculator with inflation rate input and dollar amount fields for computing future or past purchasing power
- Dashboard with purchasing power chart showing how a dollar amount erodes or grows over the selected period
- Forward and backward projections - see what current money is worth in 10 years or what past money equals today
- Custom inflation rate support allowing any percentage from historical averages to higher estimates
- Multi-year comparison table with color-coded input cells (yellow) and auto-calculated values (blue)
- Works in Microsoft Excel, Google Sheets, and LibreOffice Calc with no setup required
Preview
See what's inside this template
How to Use This Inflation Calculator Template
Enter the dollar amount
Input a starting amount in today dollars that you want to project forward or backward for inflation impact.
Set the inflation rate
Enter an annual inflation rate percentage. Historical averages range from 2% to 4%, but you can use any rate.
Choose the time period
Enter the number of years to project. The calculator works both forward (future value) and backward (past value).
Read purchasing power
The results show how much the original amount is worth in future or past dollars, and the multi-year table shows the erosion year by year.
Built by Claude AI. Perfected by us.
We use Claude AI to draft each free template, after a deep research. Then our team steps in. We refine the layout, stress-test every formula, fix edge cases, and polish the design until it feels like something we would actually use ourselves. The AI gets us 80% there. The last 20% is all human judgment.
Frequently Asked Questions
What inflation rate should I use?
The long-term US average is roughly 3% per year. Use higher rates for conservative planning or lower rates for recent low-inflation periods.
Can I project backward in time?
Yes. The calculator works in both directions. Enter a past year count to see what a historical amount would be worth in today dollars.
Does it compound the inflation?
Yes. Inflation compounds annually, meaning each year reduction is applied to the already-reduced value from the prior year.
Is this useful for retirement planning?
Yes. Understanding inflation impact helps estimate future living costs and the real value of retirement savings over a long time horizon.
How do I open this in Google Sheets?
Upload the .xlsx file to Google Drive, then open it with Google Sheets. All formulas and formatting will be preserved.
What license is this template under?
All free templates are released under CC BY 4.0 (Creative Commons Attribution). You can use, modify, and share them freely - including for commercial purposes - as long as you credit FinancialAha.com. They are provided as-is and do not constitute financial advice.
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