Inflation Calculator
See what a US dollar amount is worth in another year using the official CPI-U series, 1913 to today. Enter an amount and two years to get the equivalent value, the cumulative and annualized inflation rates, and a purchasing-power chart across the whole period. For example, $100 in 2000 ≈ $182 in 2024.
$186.96 in 2025
$100.00 in 2000 has the same buying power as $186.96 in 2025.
Cumulative inflation: 87.0% · Average: 2.5% per year (over 25 years)
Year-by-year value
| Year | Value of $100.00 from 2000 |
|---|---|
| 2000 | $100.00 |
| 2001 | $102.85 |
| 2002 | $104.47 |
| 2003 | $106.85 |
| 2004 | $109.70 |
| 2005 | $113.41 |
| 2006 | $117.07 |
| 2007 | $120.38 |
| 2008 | $125.03 |
| 2009 | $124.59 |
| 2010 | $126.63 |
| 2011 | $130.63 |
| 2012 | $133.33 |
| 2013 | $135.28 |
| 2014 | $137.48 |
| 2015 | $137.64 |
| 2016 | $139.38 |
| 2017 | $142.35 |
| 2018 | $145.82 |
| 2019 | $148.47 |
| 2020 | $150.30 |
| 2021 | $157.36 |
| 2022 | $169.95 |
| 2023 | $176.95 |
| 2024 | $182.17 |
| 2025 | $186.96 |
Source: CPI-U, US city average, all items, annual average, base 1982-84=100 (U.S. Bureau of Labor Statistics, CPI-U). Note — 2025: 11-month average — Oct 2025 missing (government shutdown). How we calculate →
How the inflation calculator works
The calculator uses the Consumer Price Index (CPI-U) from the U.S. Bureau of Labor Statistics — the official measure of how prices change for a typical urban household. To move a dollar amount from one year to another, it multiplies by the ratio of the two years' CPI values. Pick a start year, an end year and an amount, and it returns the equivalent value instantly using the full 1913-to-present CPI-U table built into the page.
The formula
The math is one line: adjusted amount = original amount × (CPI in end year ÷ CPI in start year). For example, the CPI-U averaged 172.2 in 2000 and 313.7 in 2024, so $100 in 2000 is worth 100 × (313.7 ÷ 172.2) ≈ $182 in 2024. Run it in reverse (end year earlier than start year) and you get what a later dollar would have bought in the past.
Cumulative vs annualized inflation
The result shows two rates that are easy to confuse. Cumulative inflation is the total price increase over the whole period — prices roughly 82% higher between 2000 and 2024 in the example above. The annualized rate is the average per year that compounds to that total: about 2.5% a year over those 24 years. Both come from the same CPI ratio; the annualized figure is the geometric average, not the simple total divided by the number of years.
What the CPI is and how it measures inflation
The CPI tracks the price of a fixed “basket” of goods and services — food, housing, transport, medical care, recreation and more — that represents what urban consumers actually buy. BLS surveys thousands of prices every month and weights them by how much households spend on each category. The percentage change in that index is the inflation rate. Because it's a single all-items average, your personal inflation can differ if your spending leans heavily toward one category like rent or healthcare.
How much the dollar has lost since 1913
The CPI-U series starts in 1913 at 9.9 and stands above 320 today, which means a 1913 dollar buys only about 3 cents' worth of today's goods — the dollar has lost roughly 97% of its purchasing power over the period. Put the other way, you'd need around $32 today to match the buying power of $1 in 1913. The purchasing-power chart on this page plots that decline across the whole series.
Data, limits and the 2025–2026 figures
Figures use the CPI-U, US city average, all items, annual average (base 1982-84 = 100). The last fully complete annual average is 2024. The 2025 figure is an 11-month average (October 2025 was unavailable during the federal funding lapse), and the 2026 value shown is the latest monthly reading, partial through May 2026 — both are marked with an asterisk in the year menu. Treat very recent years as provisional until BLS publishes the final annual averages.
Frequently asked questions
How do you calculate inflation?
Divide the price index in the later year by the index in the earlier year, subtract 1, and multiply by 100. Using the CPI-U, inflation from 2020 (258.8) to 2025 (321.9) is (321.9 ÷ 258.8 − 1) × 100 ≈ 24%. The calculator does this for any two years from 1913 onward.
How much is $1 in 1913 worth today?
About $32. The CPI-U rose from 9.9 in 1913 to over 320 today, so a 1913 dollar has roughly 32 times less purchasing power. (Our series starts in 1913, the first year of the official CPI; earlier estimates exist but are less reliable.)
What is the formula for the inflation calculator?
Adjusted amount = original amount × (CPI in end year ÷ CPI in start year). For example, $100 in 2000 (CPI 172.2) equals 100 × (313.7 ÷ 172.2) ≈ $182 in 2024 (CPI 313.7).
How much was $100 in 1980 worth today?
About $391 in 2025. The CPI-U averaged 82.4 in 1980 and 321.9 in 2025, so $100 × (321.9 ÷ 82.4) ≈ $391 — prices have roughly quadrupled since 1980.
What will $1 be worth in 20 years?
This tool measures past inflation from real CPI data, so it can't predict the future. As a rough guide, at 3% average inflation a dollar loses about 45% of its buying power over 20 years (it would take about $1.81 to match today's $1). Use a compound-interest or savings calculator for forward projections.
How do I calculate the inflation rate between two years?
Take the CPI for each year, divide the later by the earlier, subtract 1 and multiply by 100. The calculator shows this as the cumulative rate, plus the annualized (average per-year) rate for the same period.
What is the CPI and how is it used to measure inflation?
The Consumer Price Index tracks the average price of a fixed basket of goods and services bought by urban households. BLS measures thousands of prices monthly and weights them by spending; the percentage change in the index is the inflation rate.
How much has the dollar lost in value since 1913?
Roughly 97%. With the CPI-U rising from 9.9 in 1913 to over 320 today, a 1913 dollar now buys only about 3 cents' worth of goods. The purchasing-power chart on this page shows the full decline.
Researched & verified by the Calcuris Data & Research Team. How we build and check our tools →