About

A dollar in 1970 does not purchase what a dollar purchases today. The Bureau of Labor Statistics publishes the Consumer Price Index for All Urban Consumers (CPI-U) monthly. This index measures the average change in prices paid by urban consumers for a fixed basket of goods and services. Failing to account for inflation when planning retirement withdrawals, negotiating salaries, or evaluating historical costs leads to systematic overestimation of real wealth. This calculator uses official annual-average CPI-U data from 1913 through 2024 to compute exact purchasing power equivalence, cumulative inflation, and the annualized compound inflation rate between any two years in that range.

Limitations: CPI-U reflects urban consumer expenditure patterns. It does not capture rural pricing, asset inflation, or individual spending profiles. Regional cost-of-living variance can deviate significantly from the national index. The tool assumes the published annual average CPI value for each year. Pro tip: when comparing salaries across decades, also factor in changes to tax brackets and benefit structures that CPI does not measure.

Formulas

The purchasing power equivalence between two years is derived from the ratio of their Consumer Price Index values.

V_target = V_original × CPI_targetCPI_original

where V_original = the monetary amount in the starting year, CPI_original = the CPI index for the starting year, and CPI_target = the CPI index for the target year.

The cumulative inflation rate over the period is:

r_cumulative = CPI_target − CPI_originalCPI_original × 100%

The annualized (compound) inflation rate is:

r_annual = ( (CPI_targetCPI_original)¹ⁿ − 1 ) × 100%

where n = the number of years between the start and target year. When n = 0, the annualized rate is undefined and not displayed.

Reference Data

Year	CPI-U (Annual Avg)	$1.00 in 1913 equals	Year-over-Year Inflation
1913	9.9	$1.00	-
1920	20.0	$2.02	15.6%
1930	16.7	$1.69	−2.3%
1940	14.0	$1.41	0.7%
1950	24.1	$2.43	1.3%
1960	29.6	$2.99	1.7%
1970	38.8	$3.92	5.7%
1980	82.4	$8.32	13.5%
1990	130.7	$13.20	5.4%
2000	172.2	$17.39	3.4%
2005	195.3	$19.73	3.4%
2008	215.3	$21.75	3.8%
2010	218.1	$22.02	1.6%
2015	237.0	$23.94	0.1%
2018	251.1	$25.36	2.4%
2020	258.8	$26.14	1.2%
2021	270.97	$27.37	4.7%
2022	292.66	$29.56	8.0%
2023	304.70	$30.78	4.1%
2024	312.55	$31.57	2.6%

Frequently Asked Questions

The CPI-U (Consumer Price Index for All Urban Consumers) is published by the U.S. Bureau of Labor Statistics and covers approximately 93% of the U.S. population. It tracks a basket of goods including food, housing, apparel, transportation, medical care, and recreation. Alternative indices like CPI-W (wage earners only) or the PCE deflator (used by the Federal Reserve) weight categories differently. CPI-U is the most widely referenced for inflation adjustment of contracts, tax brackets, and Social Security benefits.

CPI-U represents a national urban average across a fixed basket. If your spending is concentrated in categories like healthcare (which rose faster than average, at roughly 4.5% annually since 2000) or technology (which experienced deflation), your personal inflation rate diverges from the index. Geographic variation also matters: housing costs in San Francisco inflated far more than the national CPI housing component.

Deflation occurs when the CPI drops year-over-year. This happened notably during the Great Depression (1929-1933, cumulative deflation of about 24%) and briefly in 2009 (CPI fell 0.4%). The formula handles deflation naturally: if CPI of the target year is lower than the start year, the adjusted value will be less than the original, meaning each dollar bought more goods in the target year.

The embedded dataset is US CPI-U only. Other countries publish their own consumer price indices (e.g., UK RPI/CPIH, Eurozone HICP, Japan national CPI). The mathematical formula is identical across all CPI-based calculations. You would need the appropriate national CPI series to compute purchasing power equivalence in another currency.

Cumulative inflation is the total percentage change in prices over the entire period. For example, from 2000 to 2024, cumulative inflation was approximately 81.5%. The annualized rate is the constant yearly rate that, compounded over the same period, produces the same total change. For the same period, the annualized rate is approximately 2.50%. The annualized figure is more useful for comparing inflation across periods of different lengths.

Partially. The BLS applies hedonic quality adjustments to certain categories, particularly electronics and vehicles. A 2024 laptop at the same price as a 2010 laptop delivers far greater computing power; hedonic adjustment attempts to separate the price change from the quality change. Critics argue this understates perceived inflation because consumers still pay the listed price. The Boskin Commission (1996) estimated CPI overstated inflation by about 1.1 percentage points annually, leading to methodological reforms.