Inflation CalculatorWhat your dollar was really worth

Money doesn't hold still. A dollar in 1980 bought a movie ticket, a gallon of gas, and change left over; the same dollar today barely covers a candy bar. An inflation calculator measures that drift. It takes an amount, a starting year, and an ending year, and tells you how many of today's dollars you'd need to match the buying power of the original sum.

The math behind it is simple. Every month the U.S. Bureau of Labor Statistics prices a fixed "basket" of goods and services — rent, groceries, fuel, healthcare, a haircut — and rolls the result into a single number called the Consumer Price Index (CPI). To convert a past amount into present dollars, you multiply it by the ratio of the two years' index values: adjusted = amount × (CPI target ÷ CPI source). That's the entire engine. Everything this page shows you is built on that one line.

Nominal vs. real value

The number you see on a price tag or an old paycheck is the nominal value — the raw figure, frozen in its moment. The real value is what that figure was actually worth in terms of what it could buy. A $30,000 salary in 1995 sounds modest next to a $30,000 salary today, but in real terms the 1995 version commanded far more. Confusing the two is how people convince themselves the past was cheaper than it really was, or that a raise kept up with prices when it didn't.

Why the rate compounds

Inflation is quoted as an annual percentage, but it stacks year over year like interest. Three percent a year doesn't mean prices are 30% higher after a decade — it's closer to 34%, because each year's increase is applied on top of the last. Over thirty or forty years that compounding is the difference between a number that feels familiar and one that feels absurd. It's also why a seemingly gentle 2–3% target still cuts a currency's buying power roughly in half over a working lifetime.

What the CPI doesn't capture

The CPI is a national average, and your life isn't average. If you rent in a hot city, pay college tuition, or have steep medical costs, your personal inflation can run well above the headline rate; if you own your home outright and drive little, it can run below. The index also struggles with quality changes — a phone today does far more than one from 2005 at a similar price — and with substitution, when shoppers switch from beef to chicken because beef got expensive. Treat the result here as a sound, well-sourced estimate of broad buying power, not a precise measure of your individual budget.

Looking forward: projecting into the future

The past is measured; the future isn't. There's no CPI for a year that hasn't happened, so when you pick a target year beyond the latest data this tool switches to a projection: it takes the most recent CPI and grows it by a constant assumed rate, compounding every year. On the chart that future stretch is drawn as a dashed amber line — a reminder that it's a scenario, not a fact.

Which rate? There's no single correct number. The Federal Reserve aims for 2% a year over the long run. US inflation has averaged about 3.2% annually since 1913, but closer to 2.5% over the last three decades. We default to 2.5% — between the Fed's target and the long-run history — and let you slide it anywhere from 0% to 8%. Expecting a higher-inflation era? Set 3–4%. Trust the Fed to hit its target? Set 2%.

Treat any projection as "if inflation averages X% per year," never as a prediction. Because the rate compounds, small differences swing the result a lot over time: $10,000 grown for 30 years is about $21,000 at 2.5% but $24,300 at 3% — thousands of dollars apart from half a percentage point.