Is buying power the same as inflation?
No. Inflation is the rate assumption; buying power is what today's dollars can purchase after that rate compounds at these assumptions.
Buying power calculator
What does today's money buy in future dollars?
Enter today's dollars, choose a timeline, and use CPI or a custom rate assumption to estimate future buying power at these assumptions.
Direct answer
Buying power is the quiet part of compounding.
When costs compound, the same nominal dollars buy less of the future basket. This calculator shows the estimated future buying power of today's dollars at these assumptions, plus the future dollars needed to preserve the same purchasing power.
Modeled result
Future buying power, not a prediction.
Future buying power
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Estimated purchasing power in today's dollars at these assumptions.
Future dollars needed
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Nominal dollars needed to preserve today's buying power at these assumptions.
Buying-power change
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Modeled loss of purchasing power at these assumptions.
Loading CPI context...
How to read it
Nominal dollars are not the whole story.
If costs compound faster than dollars grow, the same number of dollars covers less of the future. This calculator keeps that denominator visible at these assumptions.
- The default CPI rate is sourced from rates.json and labeled in the result.
- Custom rates are user-entered assumptions, not source data.
- For goal-specific cost growth, use the personal inflation rate calculator, future-cost calculator, or home-affordability calculator.
- For a quick resource comparison, use the on-track checkup. The calculators hub lists every shipped calculator.
FAQ
Common buying-power questions
Why show future dollars needed?
It is the nominal amount needed in the future to preserve the purchasing power of today's dollars at these assumptions.
Can I use a custom rate?
Yes. Custom lets you test a rate that is different from CPI, while keeping the assumption visible.