What CPI data does this calculator use?

This calculator uses the U.S. Consumer Price Index for All Urban Consumers (CPI-U), annual average values, published by the U.S. Bureau of Labor Statistics (BLS). Data covers 1913–2024.

What does the "equivalent value" mean?

The equivalent value tells you how much money you would need in the "to" year to have the same purchasing power as your original amount in the "from" year. For example, $100 in 1980 is equivalent to about $314 in 2024 - you would need $314 to buy the same things.

Can I calculate future inflation?

No. This calculator uses historical recorded CPI values only. Future inflation is unpredictable and not estimated here. For future projections, use a compound interest calculator with an assumed inflation rate.

Why does inflation vary so much from year to year?

Inflation is driven by supply and demand, energy prices, monetary policy, and economic shocks. The US saw very high inflation in the 1970s (oil crisis), low stable inflation in the 1990s–2010s, and a spike in 2021–2023 following COVID-19 pandemic supply disruptions and stimulus spending.

Inflation Calculator - Historical CPI Purchasing Power

Purchasing power comparison
Item	Value
$100.00 in 1980	$100.00
Equivalent in 2024	$381.31

Purchasing power comparison

Item

Value

$100.00 in 1980

$100.00

Equivalent in 2024

$381.31

CPI components breakdown

Category	Approximate CPI weight
Housing (rent, owners' equivalent rent, utilities)	~32%
Transportation (vehicles, fuel, insurance)	~17%
Food and beverages	~13%
Medical care	~9%
Education and communication	~7%
Recreation	~6%
Apparel	~3%
Other goods and services	~13%

These weights are updated periodically by the BLS based on consumer spending surveys. Housing is by far the largest component, which is why rent increases have an outsized effect on headline CPI.

Purchasing power in context

Concrete examples make inflation tangible. Using CPI-U data:

$100 in 1980 had the purchasing power of approximately $375 in 2024 (cumulative inflation ~275%)
$100 in 2000 had the purchasing power of approximately $180 in 2024
A $50,000 salary in 2000 would need to be roughly $90,000 in 2024 to maintain the same purchasing power

This tool calculates the exact equivalent for any year and amount using annual CPI-U averages.

What is inflation?

Inflation is the rate at which the general level of prices for goods and services rises over time, which means the purchasing power of money falls. A dollar today buys less than it did ten years ago, and considerably less than a dollar in 1950.

How purchasing power is calculated

This calculator uses the Consumer Price Index for All Urban Consumers (CPI-U), published annually by the U.S. Bureau of Labor Statistics. The equivalent value is calculated as:

Equivalent Value = Amount × (CPI in To Year / CPI in From Year)

The cumulative inflation rate is:

Cumulative Inflation = (CPI To / CPI From − 1) × 100

The average annual rate is the geometric mean:

Annual Rate = ((CPI To / CPI From)^(1/years) − 1) × 100

Historical US inflation highlights

1913–1950: Moderate inflation with significant deflation during the Great Depression (1929–1933).
1970s: Very high inflation (stagflation) driven by oil embargoes and monetary policy. CPI nearly doubled from 38.8 (1970) to 82.4 (1980).
1983–2020: The "Great Moderation": low, stable inflation averaging around 2–3% per year.
2021–2023: A surge to 40-year highs driven by COVID-19 supply disruptions, fiscal stimulus, and energy shocks.

About the data

All values are based on the U.S. CPI-U annual average (all items, not seasonally adjusted), published by the Bureau of Labor Statistics. Data is available from 1913 through 2024. Future years are not projected by this tool.