US Inflation Calculator (1913 - 2024)

How to Use the Inflation Calculator

This calculator measures how inflation has historically eroded the purchasing power of the US Dollar from 1913 up through the present day. To calculate the equivalent value of your money:

• Starting Amount: Enter a dollar value.
• Start Year: Enter the historical year you want to compare against.
• End Year: Enter the target year you want the equivalent value in. (Usually the current year).

The tool calculates the cumulative inflation (the total percentage increase in prices) and the average annual inflation (the compound annual growth rate) between the two chosen years.

What is Inflation?

Inflation is the rate at which the general level of prices for goods and services rises, subsequently reducing purchasing power. When the general price level rises, each dollar buys fewer goods and services. A small amount of inflation is considered a sign of a healthy economy, but high inflation can quickly erode savings and investments.

How is Purchasing Power Calculated?

The calculation relies on the Consumer Price Index for All Urban Consumers (CPI-U) provided by the US Bureau of Labor Statistics. The CPI is a measure that examines the weighted average of prices of a basket of consumer goods and services, such as transportation, food, and medical care.

The mathematical formula to determine the equivalent value is:

Practical Examples of Inflation

• The Roaring Twenties to the Great Depression: Between 1920 and 1933, the United States actually experienced a significant period of deflation. The CPI dropped from 19.3 to 12.9. This meant $100 in 1920 had the same purchasing power as $66.84 in 1933.
• The Great Inflation (1970s): The 1970s were categorized by rapid inflation. Between 1970 and 1980, prices more than doubled, driven by energy crises and monetary policy. $100 in 1970 required over $205 in 1980 just to maintain the same standard of living.
• Modern Post-Pandemic Inflation: Following the global events of 2020, inflation spiked sharply. Between 2020 and 2024, cumulative inflation reached nearly 20%, significantly impacting household budgets across the country.

Why Does the Federal Reserve Target 2% Inflation?

You might wonder why central banks like the Federal Reserve aim for any inflation at all, rather than 0%. The primary reason is that a low, steady rate of inflation encourages economic growth. If consumers know prices will be slightly higher in the future, they are more likely to spend or invest their money today rather than hoarding it. Furthermore, it provides a "buffer" against the risks of deflation, which can lead to severe economic contractions and high unemployment.