Inflation Calculator
Inflation Adjuster
Inflation is the gradual increase in the general price level of goods and services over time, which reduces the purchasing power of money. What costs $100 today may cost $110 or more in a few years, meaning your money buys less than it used to. Understanding and accounting for inflation is essential for long-term financial planning, whether you are saving for retirement, estimating future expenses, negotiating a salary, or evaluating investment returns.
The Inflation Calculator helps you convert nominal dollar amounts into inflation-adjusted real values, allowing you to understand the true purchasing power of money across different time periods. It supports converting a current amount to its future equivalent given an assumed inflation rate, or calculating what a past amount would be worth today.
Inflation is typically measured using the Consumer Price Index (CPI), which tracks the average change in prices paid by consumers for a representative basket of goods and services. The U.S. Bureau of Labor Statistics publishes CPI data monthly. The annual inflation rate in the United States has averaged approximately 3.3 percent over the past century, though it has varied significantly from year to year.
Understanding the difference between nominal and real values is crucial for informed financial decisions. A nominal value is the face value of money at a given point in time, unadjusted for inflation. A real value reflects actual purchasing power. The effects of inflation compound over time, making it a critical consideration for long-term goals.
Begin by selecting the calculation mode: Nominal to Real or Real to Nominal. For Nominal to Real, enter the future amount you expect to have and see its purchasing power in today's dollars. For Real to Nominal, enter the purchasing power you want to maintain and see the future amount needed.
Enter the amount you wish to adjust, the annual inflation rate as a percentage, and the number of years. For historical calculations, use average CPI-based inflation rates. For future projections, use a reasonable estimate. The Federal Reserve targets 2 percent inflation, but a conservative long-term estimate is 3 percent.
Press Calculate to see the adjusted amount and total percentage change. For example, $50,000 in 2015 adjusted for 3 percent inflation to 2025 (10 years) would be worth approximately $67,200 in nominal terms, representing 34.4 percent total inflation.
To convert a nominal amount to its current real value:
Where i is the annual inflation rate and t is the number of years. For example, $10,000 saved 10 years ago at 3 percent inflation has a real value of $7,441.
To convert a real amount to a future nominal amount:
To maintain $50,000 of today's purchasing power in 20 years at 3 percent inflation, you will need $90,306.
The real return (Fisher equation) relating nominal returns and inflation: RealReturn = (1 + NominalReturn) / (1 + InflationRate) - 1.
Historical U.S. inflation rates by decade:
| Decade | Avg Inflation | Highest | Lowest |
|---|---|---|---|
| 1970s | 7.4% | 11.0% | 3.3% |
| 1980s | 5.6% | 10.3% | 1.9% |
| 1990s | 2.9% | 6.1% | 1.6% |
| 2000s | 2.6% | 3.8% | 0.1% |
| 2010s | 1.8% | 3.0% | 0.7% |
When planning for retirement, always use real (inflation-adjusted) return assumptions rather than nominal returns. A common mistake is projecting growth at 10 percent nominal without accounting for inflation. The real return after 3 percent inflation would be closer to 7 percent.
Consider Treasury Inflation-Protected Securities (TIPS) or Series I Savings Bonds for the portion of your portfolio that needs to maintain purchasing power. These securities adjust their principal based on CPI changes.
Use the inflation calculator to determine your real wage growth. If you receive a 3 percent raise but inflation is 4 percent, your real income has decreased by approximately 1 percent.
Inflation rates are highly uncertain and vary across countries, regions, and economic periods. Using a constant inflation rate is a simplification that does not capture variable actual inflation. Historical CPI may not reflect your personal consumption patterns.
The calculator does not account for tax bracket changes, cost-of-living adjustments for specific goods like healthcare or education, or regional differences. Different categories experience different price changes. Consult official BLS data for precise historical calculations.
- How does the inflation calculator work?
- It uses historical CPI data from the Bureau of Labor Statistics to adjust dollar amounts between years, showing how purchasing power changes over time.
- What is CPI and why does it matter?
- CPI (Consumer Price Index) measures average price changes for a basket of goods and services. It is the standard benchmark for calculating US inflation.
- Why does $100 in 1980 have less buying power today?
- Inflation erodes purchasing power. $100 in 1980 would require roughly $380 today to buy the same basket of goods.
- Can I use this to predict future inflation?
- No. This calculator only converts between historical years using actual CPI data. It cannot predict future inflation rates.
- What years of CPI data are available?
- The calculator covers CPI from 1913 (when BLS began tracking) through the most recent month available.
- U.S. Bureau of Labor Statistics. "Consumer Price Index." bls.gov.
- Federal Reserve. "Why Does the Fed Care about Inflation?" federalreserve.gov.
- Investopedia. "Inflation: What It Is and How It Works." investopedia.com.
- NerdWallet. "Inflation Calculator: What is Your Dollar's Real Worth?" nerdwallet.com.
- Bankrate. "Historical Inflation Rates." bankrate.com.
Last updated: May 12, 2026