Inflation Calculator
Calculate how inflation affects the value of money over time
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Understanding Inflation
Inflation reduces the purchasing power of money over time. The US Federal Reserve targets an average inflation rate of around 2% per year. Historical inflation rates vary based on economic conditions.
Understanding US Inflation
How the CPI Is Calculated
The Consumer Price Index (CPI) is the most widely used measure of US inflation. Published monthly by the Bureau of Labor Statistics, it tracks the average price change of a basket of roughly 80,000 goods and services that represent typical consumer spending — including food, housing, transportation, medical care, and energy. The BLS collects prices from about 23,000 retail and service establishments across 75 urban areas. CPI-U (All Urban Consumers) covers about 93% of the population and is the headline number reported in the news.
Purchasing Power Over Time
Inflation means a dollar today buys less than a dollar in the past. At the historical average of about 3% annual inflation, $100 today will have the purchasing power of only $74 in ten years and $55 in twenty years. Put another way, something that cost $1.00 in 1990 costs approximately $2.40 today. This is why keeping money in a savings account earning 0.5% means you are losing real purchasing power every year. Understanding this erosion is critical for retirement planning — a retiree who needs $50,000 a year today will need about $90,000 in 20 years to maintain the same standard of living at 3% inflation.
The Federal Reserve and Inflation Targeting
The Federal Reserve targets a 2% average annual inflation rate as part of its dual mandate of price stability and maximum employment. When inflation runs above target, the Fed raises the federal funds rate to slow borrowing and spending. When inflation falls too low (risking deflation), the Fed cuts rates to stimulate the economy. The Fed's preferred inflation measure is the PCE (Personal Consumption Expenditures) index rather than the CPI, as PCE better accounts for consumers substituting between goods when prices change.
Protecting Your Money from Inflation
Common inflation hedges include stocks (which have historically returned 7–10% annually, well above inflation), Treasury Inflation-Protected Securities (TIPS), I Bonds (which adjust their interest rate semiannually based on CPI), real estate, and commodities. Holding a diversified portfolio across these asset classes is the most effective long-term strategy for preserving purchasing power.
Frequently Asked Questions
What is inflation and how is it measured in the US?
Inflation is the rate at which prices for goods and services increase over time, reducing purchasing power. In the US, it is primarily measured by the Consumer Price Index (CPI), published monthly by the Bureau of Labor Statistics (BLS).
What is the historical average US inflation rate?
The historical average US inflation rate is approximately 3.3% per year since 1913 when CPI tracking began. However, the rate varies significantly — from deflation during the Great Depression to over 13% in 1980. Recent decades have averaged closer to 2–3%.
How does inflation affect my savings and investments?
Inflation erodes the purchasing power of money sitting in low-yield savings accounts. If inflation is 3% and your savings earn 1%, you are losing 2% in real purchasing power annually. Investing in assets that outpace inflation (stocks, TIPS, real estate) helps preserve wealth.
What are TIPS and how do they protect against inflation?
Treasury Inflation-Protected Securities (TIPS) are US government bonds whose principal adjusts with the CPI. When inflation rises, the principal increases, and so do your interest payments. TIPS guarantee a real rate of return above inflation, making them a popular hedge for conservative investors.
What is the difference between CPI and PCE inflation?
CPI (Consumer Price Index) measures the price change of a fixed basket of goods and is published by the Bureau of Labor Statistics. PCE (Personal Consumption Expenditures) is published by the Bureau of Economic Analysis and adjusts for consumer substitution behavior. The Federal Reserve prefers PCE for setting monetary policy, but CPI is more commonly cited in public discussions and used for Social Security cost-of-living adjustments.