Inflation Calculator
Calculate how inflation affects purchasing power over time. Uses historical US CPI data from 1920 to 2025.
Inflation Calculator
Calculate purchasing power over time
$100.00 in 2000 equals
$187.93
in 2025 dollars
$100.00
in 2000
$187.93
in 2025
+87.93%
over 25 years
+2.56%
compound rate
Purchasing Power Lost
You would need $187.93 today to have the same purchasing power as $100.00 in 2000.
US Inflation by Decade
0.1%
1920s
-1.9%
1930s
5.6%
1940s
2.0%
1950s
2.4%
1960s
7.1%
1970s
5.5%
1980s
3.0%
1990s
2.6%
2000s
1.8%
2010s
4.2%
2020s
Average annual inflation rate per decade. The 1970s-80s had the highest inflation (stagflation era).
Understanding Inflation
Inflation erodes the purchasing power of money over time. What cost $1 in 1920 would cost over $15 today. Understanding inflation is crucial for retirement planning, salary negotiations, and investment decisions.
Key Inflation Concepts
- CPI (Consumer Price Index): The primary measure of US inflation
- Core Inflation: CPI excluding volatile food and energy prices
- Real vs Nominal: Real values are adjusted for inflation; nominal are not
- Fed Target: The Federal Reserve targets 2% annual inflation
Historical Context
High Inflation Periods
- 1970s-80s Stagflation: Oil crises pushed inflation to 13.5%
- Post-WWII (1946-48): Pent-up demand caused 14%+ inflation
- 2021-2022: COVID-19 supply chain issues hit 8%
Low/Negative Inflation
- Great Depression: Prices fell 25% from 1929-1933
- 2010s: Post-2008 crisis, inflation stayed under 2%
- 2015: Near-zero inflation at just 0.1%
Frequently Asked Questions
What is inflation and how does it affect purchasing power?
Inflation is the rate at which prices for goods and services rise over time, reducing what your money can buy. If inflation is 3%, something that costs $100 today will cost $103 next year. This means your purchasing power decreases unless your income grows faster than inflation.
How is inflation measured in the US?
The US measures inflation primarily through the Consumer Price Index (CPI), calculated by the Bureau of Labor Statistics. CPI tracks the average price change of a basket of consumer goods and services including food, housing, transportation, medical care, and more.
What is the historical average inflation rate?
The average US inflation rate since 1920 is approximately 3.3% per year. However, this varies significantly by decade: the 1970s-80s saw double-digit inflation, while the 2010s averaged under 2%. The Federal Reserve currently targets 2% annual inflation.
How do I calculate future purchasing power?
To estimate future purchasing power, divide your current amount by (1 + inflation rate)^years. For example, at 3% inflation, $100 today will have the purchasing power of about $74 in 10 years. Our calculator does this math automatically using historical or custom rates.
What was the highest inflation period in US history?
The highest sustained inflation in modern US history occurred during the 'stagflation' era of the late 1970s and early 1980s. Inflation peaked at 13.5% in 1980. The COVID-19 pandemic also triggered high inflation, reaching 8% in 2022.
Has the US ever experienced deflation?
Yes, the US experienced significant deflation during the Great Depression (1929-1933), with prices falling nearly 25%. More recently, 2009 saw slight deflation (-0.4%) during the financial crisis. Deflation can be economically harmful as it discourages spending.
How can I protect my money from inflation?
Common inflation hedges include: investing in stocks (historically outpace inflation), real estate, Treasury Inflation-Protected Securities (TIPS), I-Bonds, commodities, and keeping money in high-yield savings accounts. Holding cash long-term loses purchasing power.
What's the difference between nominal and real returns?
Nominal returns are the raw percentage gain on an investment. Real returns subtract inflation, showing actual purchasing power gained. If your investment returns 7% but inflation is 3%, your real return is approximately 4%.
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