Inflation Calculator

Calculate the effects of inflation on purchasing power over time. Use historical U.S. CPI data from 1913 to present, or project future values using custom inflation rates.

Calculate the equivalent value of money between any two dates using actual U.S. Consumer Price Index data.

Project future purchasing power based on a fixed annual inflation rate.

Determine what a future amount would have been worth in the past.

U.S. Historical Inflation Rates (1950-2025)

Annual inflation rate based on Consumer Price Index changes. Hover over the chart for specific values.

Historical Annual Inflation Rates

The table below shows annual average inflation rates for the United States based on Consumer Price Index data.

Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Avg

Understanding Inflation

What is Inflation?

Inflation is the rate at which the general level of prices for goods and services rises, causing purchasing power to fall. Central banks attempt to limit inflation and avoid deflation to keep the economy running smoothly. When inflation rises, every dollar you own buys a smaller percentage of a good or service.

The most common measure of inflation is the Consumer Price Index (CPI), which measures the average change over time in prices paid by urban consumers for a market basket of consumer goods and services. In the United States, the Bureau of Labor Statistics (BLS) calculates and publishes the CPI monthly.

How Inflation is Calculated

The inflation rate is typically calculated using the following formula:

Inflation Rate Formula:
Inflation Rate = ((CPI in Current Period - CPI in Previous Period) / CPI in Previous Period) x 100

For example, if the CPI was 236.916 in January 2016 and 242.839 in January 2017:
Inflation Rate = ((242.839 - 236.916) / 236.916) x 100 = 2.5%

Types of Inflation

  • Demand-Pull Inflation: Occurs when aggregate demand in an economy outpaces aggregate supply. This is often summarized as "too much money chasing too few goods."
  • Cost-Push Inflation: Results from increases in production costs, such as raw materials and wages. Companies pass these higher costs to consumers in the form of increased prices.
  • Built-In Inflation: Results from the expectation of future inflation. As prices rise, workers demand higher wages, which leads to higher production costs and further price increases.
  • Hyperinflation: An extremely high and typically accelerating rate of inflation, often exceeding 50% per month. Historical examples include Germany in the 1920s, Zimbabwe in the 2000s, and Venezuela in recent years.

Historical Inflation in the United States

U.S. inflation has varied significantly throughout history:

  • 1970s-1980s: The U.S. experienced high inflation due to oil embargoes and economic policies. Inflation peaked at 13.58% in 1980.
  • 1990s-2000s: A period of relatively stable, moderate inflation averaging around 2-3% annually.
  • 2008-2009: The financial crisis led to deflationary pressure, with inflation dropping to -0.34% in 2009.
  • 2020-2022: The COVID-19 pandemic and subsequent economic responses led to significant inflation, reaching 8.00% in 2022.
  • 2023-2025: Inflation has been gradually declining toward the Federal Reserve's 2% target.

Effects of Inflation

Inflation has wide-ranging effects on the economy and individuals:

  • Reduced Purchasing Power: The most direct effect is that money buys less over time. A dollar today is worth less than a dollar was ten years ago.
  • Interest Rates: Central banks often raise interest rates to combat inflation, which affects borrowing costs for mortgages, car loans, and credit cards.
  • Savings and Investments: Inflation erodes the real value of savings. If your savings earn 2% interest but inflation is 3%, you're losing purchasing power.
  • Wage Adjustments: Workers often demand higher wages to keep up with rising prices, leading to cost-of-living adjustments (COLAs).
  • Income Redistribution: Inflation can benefit debtors (who repay loans with less valuable dollars) and hurt creditors and savers.

Deflation: The Opposite Problem

Deflation occurs when prices fall over time, increasing the purchasing power of money. While this might seem beneficial, deflation can be economically harmful:

  • Consumers delay purchases expecting prices to fall further, reducing economic activity
  • Businesses see lower revenues and may cut wages or lay off workers
  • The real burden of debt increases as money becomes more valuable
  • A deflationary spiral can lead to severe economic depression
Japan's Lost Decades: Japan experienced prolonged deflation from the 1990s through the 2010s, resulting in economic stagnation. This period, known as the "Lost Decades," serves as a cautionary example of deflation's dangers.

Economic Theories on Inflation

Keynesian View: Keynesians believe that inflation results from economic pressures such as rising production costs or increases in aggregate demand. They advocate for government intervention through fiscal and monetary policy to manage inflation.

Monetarist View: Monetarists, following Milton Friedman, argue that "inflation is always and everywhere a monetary phenomenon." They believe controlling the money supply is the primary tool for managing inflation.

Protecting Against Inflation

Investors and savers can use various strategies to protect against inflation:

  • Treasury Inflation-Protected Securities (TIPS): U.S. government bonds that adjust principal based on CPI changes.
  • I Bonds: Savings bonds with interest rates tied to inflation.
  • Real Estate: Property values and rents tend to rise with inflation.
  • Commodities: Investments in gold, oil, and other commodities often perform well during inflationary periods.
  • Stocks: Equities have historically outpaced inflation over long periods, though they carry higher risk.
  • Inflation-Indexed Annuities: Retirement products with payments that increase with inflation.

The Federal Reserve's Role

The Federal Reserve targets an inflation rate of approximately 2% per year, believing this provides a balance between economic growth and price stability. The Fed uses several tools to influence inflation:

  • Federal Funds Rate: Raising interest rates makes borrowing more expensive, reducing spending and slowing inflation.
  • Open Market Operations: Buying and selling government securities to influence money supply.
  • Reserve Requirements: Adjusting the amount of reserves banks must hold.
  • Quantitative Easing/Tightening: Expanding or contracting the Fed's balance sheet to influence broader financial conditions.
The Rule of 72: A quick way to estimate how long it takes for inflation to halve your purchasing power. Divide 72 by the inflation rate. At 3% inflation, your money loses half its value in about 24 years (72 / 3 = 24).