Inflation Calculator: How Much Has the Dollar Lost Since You Were Born?

In 1990, a new car cost about $16,000. The median home was $123,000. A gallon of gas was $1.15. Today those numbers are roughly $47,000, $420,000, and $3.30. That is not because cars, houses, and gas became more valuable — it is because the dollar became less valuable.

Our inflation calculator converts any dollar amount between any two years. This guide explains how inflation is measured, why it compounds, and what it means for your money.

How inflation is measured: the CPI

The Consumer Price Index (CPI) is the primary measure of inflation in the United States, published monthly by the Bureau of Labor Statistics (BLS). It tracks the price of a "basket" of goods and services that a typical household buys — food, housing, transportation, medical care, recreation, and more.

The CPI does not measure every price change — it measures the change in the cost of a fixed basket over time. When that basket costs more, inflation is positive. When it costs less, deflation occurs (rare in modern economies).

The inflation formula

To convert a dollar amount from one year to another:

Adjusted amount = Original amount x (CPI in target year / CPI in base year)

Example: $100 in 1990 vs 2025

CPI in 1990: 130.7. CPI in 2025: approximately 315.0.

Adjusted = $100 x (315.0 / 130.7) = $100 x 2.41 = $241

$100 in 1990 had the same purchasing power as about $241 today. Equivalently, $100 today buys only about what $41 bought in 1990.

Historical inflation reference points

Year	CPI (1982-84=100)	$100 today in that year's dollars
1970	38.8	$12.32
1980	82.4	$26.16
1990	130.7	$41.49
2000	172.2	$54.67
2010	218.1	$69.24
2020	258.8	$82.16
2023	304.7	$96.74

How inflation compounds over time

Low annual inflation rates compound into significant purchasing power losses over long periods. Even 3% annual inflation cuts purchasing power in half in about 24 years.

Rule of 72 for inflation: Divide 72 by the annual inflation rate to find how many years until purchasing power is halved.

Annual inflation rate	Years to halve purchasing power
2%	36 years
3%	24 years
4%	18 years
7%	10 years
10%	7 years

This is why the 2021-2023 inflation surge (peaking at 9% in June 2022) was financially significant — at 9% inflation, purchasing power halves in just 8 years.

Inflation and your savings

Money sitting in a savings account earning below the inflation rate loses real value over time. If inflation is 3% and your savings account earns 1%, your real return is -2% per year.

For savings to maintain purchasing power, the return must at least match inflation. For wealth to grow in real terms, returns must exceed inflation.

This is the core argument for investing. Historically, the S&P 500 has returned roughly 10% annually before inflation and about 7% after inflation. That 7% real return compounds significantly over decades.

What the CPI misses

The CPI is a useful approximation but has known limitations:

• Substitution bias: When steak gets expensive, people buy chicken — the CPI adjusts for this, but critics argue it understates true cost of living.
• Housing costs: The CPI uses "owners' equivalent rent" — a survey of what homeowners think they could rent their home for — rather than actual home prices. This tends to lag real housing market changes.
• Quality adjustment: When a new car costs more but also has significantly more features, the BLS adjusts the price down to account for quality improvement. This makes some price changes look smaller than they feel.
• Geographic variation: A national CPI does not capture that housing inflation in San Francisco or New York runs far above the national average.

Alternative measures like the PCE (Personal Consumption Expenditures deflator, preferred by the Federal Reserve) and chained CPI try to address some of these issues.

Inflation-proofing practical decisions

Inflation matters most for decisions made over long time horizons:

• Fixed-rate mortgages: Your payment stays constant while inflation erodes its real value. Borrowers benefit from inflation.
• Long-term savings: Any savings rate comparison should be in real (inflation-adjusted) terms.
• Salary negotiations: A 3% raise in a 4% inflation year is a real pay cut.
• Retirement planning: Future expenses in retirement will be meaningfully higher in nominal terms than today.

Use the inflation calculator to convert any dollar amount between any two years — useful for understanding historical prices, salary comparisons, or planning long-term savings targets.