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Track the true purchasing power of the US Dollar over time. Analyze historical CPI data to calculate the exact hidden tax of inflation. This free online tool allows you to calculate historical inflation quickly and accurately. No sign-up or installation required.
When your grandparents tell you that they bought their first house for $18,000 and a gallon of milk for 50 cents, they are not exaggerating. The price of goods has not actually changed—what has changed is the core mathematical value of the US Dollar.
Inflation is the silent, relentless destruction of purchasing power. Every year, as central banks print more fiat currency to fund government deficits, the supply of money increases. When there are more dollars chasing the exact same amount of goods and services, the price of everything must inevitably go up. If you hold your wealth entirely in cash, you are guaranteed to become poorer every single day.
To track inflation, the US Government uses a metric called the Consumer Price Index (CPI).
The Bureau of Labor Statistics tracks a hypothetical "basket" containing thousands of everyday items (gasoline, bread, rent, medical care, cars). Every month, they check the prices of these items. If the total cost of the basket goes up by 3% compared to last year, the official inflation rate is 3%.
"Headline CPI" includes absolutely everything. "Core CPI" deliberately strips out Food and Energy costs, because they are highly volatile and fluctuate wildly based on weather or geopolitics. Economists prefer Core CPI to see the true underlying trend of the economy.
You might assume that 0% inflation (prices staying perfectly flat) is the ultimate goal. Surprisingly, the US Federal Reserve actually targets a steady, intentional inflation rate of 2% per year.
Governments want a small amount of inflation because it forces the economy to move. If people know that cash will slowly lose its value, they are highly incentivized to spend it, invest it in businesses, or buy stocks and real estate. If the economy experiences Deflation (prices going down), people will hoard their cash because it becomes more valuable every day, causing the entire economy to grind to a halt and crash into a depression.
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