Inflation Calculator
Calculate how inflation affects purchasing power over time. Historical inflation impact calculator. Free inflation rate calculator
"$100 in 1990 is worth $230 today" — that's the headline. The interesting part is that this number depends entirely on which inflation index you pick: CPI-U (the headline US figure), Core CPI (excluding food and energy), Chained CPI (used for Social Security after 2017), or PCE (the Fed's preferred measure). Each gives a different answer to "how much have prices risen". This calculator shows the result under each index, lets you compute backwards (what does $1M today equal in 1990 money), and explains why your grandfather's "milk used to cost a nickel" feels more dramatic than CPI suggests.
Which index says what
- CPI-U (Consumer Price Index for Urban Consumers) — the headline US inflation figure. Basket of ~80,000 prices across categories weighted by typical urban consumer spending. What "inflation is X%" usually means in news.
- Core CPI — CPI-U minus food and energy. Used by the Fed for monetary policy because food/energy prices are volatile and not driven by monetary conditions. Lower volatility but tracks the same long-run trend.
- Chained CPI (C-CPI-U) — uses chained-aggregation that accounts for substitution (consumers buy less of items that get expensive). Typically runs 0.2-0.3 percentage points below CPI-U.
- PCE (Personal Consumption Expenditures Price Index) — the Fed's preferred measure since 2000. Different basket weighting (uses national accounts data) and chained formula. Runs ~0.3-0.5 pp below CPI-U over long periods.
- HICP (Harmonized Index of Consumer Prices) — EU equivalent. Comparable across member states. The ECB targets HICP, not national indexes.
Working example
Input
Amount: $1,000 in January 1990 Convert to: today (May 2026) Index: CPI-U
Output
$1,000 (Jan 1990) → $2,440 (May 2026) Cumulative inflation: 144% Average annual inflation: 2.5% Under different indexes: CPI-U: $2,440 (144% cumulative) Chained CPI: $2,320 (132% cumulative — substitution effect) PCE: $2,260 (126% cumulative — different weighting) HICP (Eurozone, EUR equiv): ~€2,150 (115% cumulative since 1999)
The 18% gap between CPI-U ($2,440) and PCE ($2,260) is non-trivial — it changes a back-of-envelope "what was a Boomer salary worth" comparison by tens of thousands of dollars over careers.
Why "the grocery feels more expensive" than CPI shows
- CPI is a basket average; your personal basket is not the average. If you spend more on housing, healthcare, and education (all faster-than-CPI) and less on electronics and apparel (often deflating), your personal inflation can run 2-3 pp above headline.
- Quality adjustments — when a 2026 car has features the 1990 car did not, BLS adjusts the price to keep "the same car" comparable. Critics argue this understates actual cost growth for consumers who could buy "just a basic car".
- Substitution adjustments in Chained CPI — assumes consumers switch from steak to chicken when beef gets expensive. Mathematically defensible, but feels like "you can have less and call it the same".
- Owner-equivalent rent — instead of measuring home purchase prices (volatile, asset-like), CPI imputes "what would you pay to rent your own house". This dampens housing inflation in CPI relative to what homebuyers actually experience.
- Frequency — official CPI updates monthly. Your perception updates every grocery trip. You remember the price increases; you do not remember the things that got cheaper (electronics, long-distance calls).
When to reach for this tool
- You are evaluating a historical salary, contract value, or asset price and want a meaningful "in today's money" comparison.
- You are planning retirement and want to model "how much purchasing power will my $X be worth in 30 years at Y% inflation?".
- You are reading an old book/article that says "this cost $50,000" and want context for whether that was a fortune or pocket change in its era.
- You are negotiating a long-term contract with inflation-adjustment clauses and want to understand which index gives which result.
What this tool will not do
- It will not predict future inflation. Long-run averages (2.5% for the post-WW2 US, varying for other countries) are starting points, not forecasts. The 2022 inflation spike (9% headline) was outside the recent-decades range; future surprises happen.
- It will not adjust for cost-of-living differences across regions. National CPI averages New York and Mississippi; your local inflation differs. BLS publishes regional CPI; this tool uses national figures only.
- It will not handle hyperinflation. Tools designed for 2% inflation do not gracefully extend to Argentina-2023 (200%/yr) or Weimar Germany-1923 (literal exponential). Hyperinflation requires daily or weekly indexes and entirely different math.
Frequently asked questions
Why does my paycheck "not keep up with inflation" if my raise matches CPI?
CPI keeps your real purchasing power flat — same goods, same year. It does not give you a "raise" in real terms. Career growth typically gives you above-inflation raises in your 20s-40s, plateaus in 50s, declines in real terms in 60s. Matching CPI means stagnation, not progress.
Is CPI accurate?
For its stated purpose (average price change in a stable basket), yes. As a measure of "what individuals personally experience", it understates inflation for low-income and high-income households (whose baskets differ from average) and overstates inflation for those whose consumption shifts toward the items that fall behind the average. Use CPI for macroeconomic comparison, personal calculations for your own situation.
What is "real" vs "nominal" dollar?
Nominal is the printed-on-the-bill dollar. Real is inflation-adjusted to a base year. "$50,000 in 2010 dollars" is a real amount; "I made $80,000 last year" is nominal. To compare across years, convert all amounts to real dollars in the same base year.
Why is Social Security tied to Chained CPI instead of CPI-U?
Since 2017 it is — by the Tax Cuts and Jobs Act. Chained CPI grows slower than CPI-U (substitution effect), so Social Security cost-of-living adjustments are slower, saving the government ~$220B over a decade. The political fight is whether this is "more accurate" (substitution is real) or "benefit cuts in disguise" (you cannot substitute medical care).
How does inflation differ across countries?
Wildly. Long-run 2-3% for most developed economies. Eurozone runs slightly below US. Japan ran near zero for two decades. Emerging markets (Argentina, Turkey) routinely run 30-100%+. Eurozone HICP is comparable across member states; converting between national figures and across currencies requires care.
What is the difference between inflation and devaluation?
Inflation: domestic prices rise. Devaluation: your currency drops vs others. Independent in theory; correlated in practice (high inflation usually weakens a currency over time). A Polish złoty buying fewer USD is devaluation; a coffee in Warsaw costing more złoty is inflation. Both can happen at once.
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Last updated · E-Utils editorial team