Historical Inflation Calculator

The Consumer Price Index (CPI)

Inflation is the rate at which the general level of prices for goods and services is rising, and subsequently, how purchasing power is falling. Central banks attempt to limit this, and avoid deflation, in order to keep the economy running smoothly.

In the US, the Bureau of Labor Statistics measures inflation via the CPI (Consumer Price Index). They track a "basket" of goods (milk, rent, gasoline, cars) and compare its total cost month-over-month. If the exact same basket costs 3% more a year later, inflation is 3%.

The Compounding Effect of Erosion

Like Compound Interest, inflation compounds. A 3% inflation rate doesn't sound terrifying, but it means that next year, prices are 3% higher than they are today. The year after that, prices rise another 3% on top of the already inflated prices from the first year.

Example: $100,000 stuffed under a mattress in 1990 would only have the purchasing power of $39,000 by 2024. Despite still having exactly $100k in paper cash, the structural reality is that you lost over 60% of your wealth to exactly zero visible taxation.

Nominal vs. Real Returns

The only way to defeat inflation is to invest capital into assets that grow faster than the monetary decay. This introduces two crucial economic terms:

• Nominal Return: The raw, simple return on your investment. If you buy a bond returning 5%, your Nominal Return is 5%.
• Real Return: Your return after subtracting the inflation rate. If inflation is 3%, your 5% bond actually only provided a 2% Real Return in purchasing power. If inflation spikes to 8%, your 5% bond is yielding a perfectly structured -3% Real Return. You are guaranteed to lose money by holding it.