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Inflation Calculator – Purchasing Power & Price Change Over Time

Inflation silently reduces the value of money over time. $100 in 2000 bought about 76% more than $100 does today. Understanding this erosion is essential for retirement planning (your nest egg must grow faster than inflation), salary negotiation (a 2% raise in a 4% inflation environment is a real pay cut), and any long-term financial projection.

This calculator works in two directions: enter a historical amount to see its equivalent in today's purchasing power using actual CPI data, or enter a present amount and a projected inflation rate to see how much it will be worth in future years.

How to use the Inflation Calculator

Choose direction: historical (past → present using CPI data) or projection (present → future at custom rate).

Enter the dollar amount and the starting year.

For projections, enter your expected annual inflation rate.

View the inflation-adjusted equivalent and the real value change.

Purchasing Power of $100 Over Time (U.S. CPI)
Year	$100 Worth in 2025	Avg Annual Inflation
1980	≈$374	~4.2%
1990	≈$237	~2.7%
2000	≈$176	~2.4%
2010	≈$140	~3.6%
2015	≈$122	~2.0%
2020	≈$121	~4.0% (2020–2025)

Inflation Calculator FAQ

What causes inflation?

Main causes: demand-pull (too much money chasing too few goods), cost-push (rising production costs passed to consumers), and monetary (expanding money supply). Central banks target ~2% annual inflation as stable and growth-supporting.

How does inflation affect savings?

If your savings account earns 1% and inflation is 3%, you lose 2% of purchasing power per year in real terms. This is why keeping excess cash in savings long-term reduces real wealth — investing in assets that outpace inflation (stocks, real estate) is necessary for long-term wealth preservation.

What is the Rule of 70 for inflation?

Divide 70 by the annual inflation rate to estimate how long it takes for prices to double. At 3.5% inflation, prices double in about 20 years. At 7%, prices double in 10 years.

What are Treasury Inflation-Protected Securities (TIPS)?

TIPS are U.S. government bonds whose principal adjusts with CPI inflation. They guarantee a real return (above inflation) and are one of the most direct hedges against inflation available to individual investors.