Inflation Calculator

A dollar from 1990 is not the same as a dollar today. Inflation erodes purchasing power over time. This calculator shows exactly how much buying power has changed — and what a future amount needs to be to match today's purchasing power.

How to Use This Calculator

1. Enter the original amount.
2. Enter the starting year.
3. Enter the ending year (or leave as current year).
4. Select the inflation measure (CPI is the standard for US consumer prices).
5. Click Calculate to see the inflation-adjusted equivalent and cumulative inflation rate.

Inflation Formula

Adjusted Amount = Original Amount × (CPI in Ending Year ÷ CPI in Starting Year)

Example Calculations

What was $100 in 1990 worth in 2025?

• CPI 1990: 130.7 | CPI 2025: ~315
• $100 × (315 ÷ 130.7) = ≈ $241 in 2025 dollars
• Cumulative inflation 1990–2025: ≈ 141%

If you earned $50,000 in 2010, you'd need ≈ $72,000 in 2025 to have equivalent purchasing power.

What Is the CPI?

The Consumer Price Index (CPI) measures the average change in prices paid by urban consumers for a basket of goods and services (food, housing, transportation, healthcare, etc.). It's the most widely used inflation measure in the US, published monthly by the Bureau of Labor Statistics.

Common Mistakes to Avoid

• Using a single inflation rate for all goods — Healthcare and housing inflate much faster than the overall CPI. Your personal inflation rate may be higher than the headline number.
• Ignoring inflation in retirement planning — $70,000/year today needs $126,000/year in 25 years at 3% annual inflation. Always inflation-adjust your retirement income targets.
• Treating past investment returns as real returns — Subtract inflation from nominal returns to get real returns. A 7% stock return in a 4% inflation environment is only 3% real growth.

Frequently Asked Questions

What is a healthy inflation rate?

Central banks (including the US Federal Reserve) target 2% annual inflation as a sign of a healthy, growing economy. Above 4%–5% is considered high inflation; below 0% (deflation) can signal economic weakness.

How does inflation affect savings?

If your savings account earns less than the inflation rate, your money is losing purchasing power in real terms. A 1% savings account during 4% inflation means your money is effectively shrinking by 3% per year.

What causes inflation?

Demand-pull (too much money chasing too few goods), cost-push (rising production costs passed to consumers), and built-in inflation (wage-price spiral). Central banks manage inflation primarily through interest rate policy.

What is stagflation?

High inflation combined with slow economic growth and high unemployment. It occurred in the US in the 1970s and is particularly difficult to resolve because typical anti-inflation policies (raising rates) also slow growth further.

Conclusion

Inflation is the silent tax on savings and fixed incomes. Understanding its cumulative effect helps you set realistic financial goals, negotiate raises, and build investment strategies that protect your purchasing power over time.

Related: Investment Calculator | Savings Calculator | Retirement Calculator | Interest Rate Calculator