Adjusted Purchasing Power
Purchasing Power
Inflation Calculator
I built this free tool so you can punch in any dollar amount and see what it actually bought decades ago — without ads or signup screens.
$
The starting amount to evaluate
Starting baseline year
Target comparison year
Enter an amount and select two years to calculate inflation and purchasing power.
Based on the US Consumer Price Index (CPI-U), annual averages, published by the US Bureau of Labor Statistics. 2025 is a partial-year estimate. Last updated September 2026. Results are estimates of purchasing-power change, not predictions.
How to Use This Calculator
I built this calculator because other sites drown you in popups just to answer a basic question: what did something cost in yesterday's money? Here is how to run your numbers in seconds:
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1
Type in your starting cash figure
Drop any amount into the box — whether it's a $1 comic book from an old box or a $50,000 baseline salary.
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2
Pick both benchmark years
Choose the year the money was earned or spent, then select the target year you want to compare it with.
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3
Watch the adjusted value and visual bar update
The headline tells you the equivalent cash amount instantly, and the two-color bar shows how much value melted away.
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4
Use the annualized rate to size up the era
A 20-year span might sound like a massive jump until you check the yearly rate and realize prices rose at a steady 2.5% crawl.
The Formula
There's no proprietary secret sauce here. The math relies directly on the Consumer Price Index (CPI-U) figures that government statisticians publish each month to track a standard household basket of goods across time.
Adjusted Value = Cash Amount × (CPI_end ÷ CPI_start)
Cumulative Inflation (%) = ((CPI_end ÷ CPI_start) − 1) × 100
Annualized Rate (%) = ((CPI_end ÷ CPI_start) ^ (1 ÷ (End Year − Start Year)) − 1) × 100
Cumulative Inflation (%) = ((CPI_end ÷ CPI_start) − 1) × 100
Annualized Rate (%) = ((CPI_end ÷ CPI_start) ^ (1 ÷ (End Year − Start Year)) − 1) × 100
- Cash Amount The initial dollar figure you want to evaluate from your starting year.
- CPI_start The official annual average price index benchmark for your starting year.
- CPI_end The official annual average price index benchmark for your target comparison year.
- End − Start The total elapsed years used to calculate the geometric compound annual growth rate.
A quick point about price indexes: The CPI index number itself (such as 172.2 in 2000 or 322.3 in 2025) has no intrinsic dollar unit. It's an index calibrated against a historical baseline. Only the ratio between two index points determines how prices changed.
Example
Say you tucked a crisp $100 bill into a lockbox back in the year 2000, and you finally pulled it out in 2025. Here's what happened to that cash behind the scenes:
Original Cash (2000):
$100.00
Year 2000 CPI-U:
172.200
Year 2025 CPI-U:
322.300
Price Ratio (322.3 / 172.2):
1.87166
2025 Adjusted Value:
$187.17
Cumulative Price Change:
+87.2%
Prices climbed by 87.2% over those 25 years. That means it takes $187.17 today to buy the identical goods and services that $100 purchased at the start of the millennium.
I think about this whenever I look at things I bought as a kid, like [PERSONAL: what's something from your own childhood that cost a few rupees then and clearly costs several times more now?]. Running the exact math shows you just how relentless that creep is.
Now look at the mirror view: if you hold a fresh $100 bill in your wallet today, what was it worth in 2000 terms? Divide $100 by 1.8717 and you get roughly $53.43. Over a quarter century, money sitting idle lost almost half of its real purchasing power.
Inflation also moves in sudden bursts rather than straight lines. Between 2021 and 2022, the index surged from 270.970 to 292.655. That single-year 8.0% jump caused a $50 purchase to cost $54.00 just twelve months later.
Frequently Asked Questions
What is inflation in plain words?
It means stuff gets more expensive, so your money buys less. Statisticians measure it by tracking an average basket of groceries, gas, rent, and medical care over time.
What was $1 worth in a previous decade?
You can type $1 into the tool above and check any year back to 1970. For instance, $1 in 1970 had the purchasing power of roughly $8.31 today because prices rose over 730% across that 55-year span.
Why do my personal expenses feel higher than this index?
The CPI tracks an economy-wide average across hundreds of items, not your personal monthly receipts. If your rent jumped 20% or local groceries spiked (like [PERSONAL: what everyday price change in your own city has surprised you most lately?]), your wallet feels a much sharper hit than the official headline number.
What actually causes inflation to spike?
It usually boils down to too much cash chasing too few goods. Supply bottlenecks, energy spikes, and expanded money supplies all contributed to the notable price surges we felt through 2021 and 2022.
Does inflation ever go negative?
Yes, and economists call that deflation. Between 2008 and 2009 during the Great Recession, the US CPI dipped from 215.303 to 214.537, causing average prices to fall 0.4%. While cheaper goods sound pleasant, widespread deflation almost always signals job cuts and a frozen economy.