Inflation Explained: What It Is, How It’s Measured, and Why It Matters

Inflation is the rate at which the general price level of goods and services rises over time. When inflation is positive, each dollar generally buys less than it did before. But inflation is not the same as “everything is expensive,” and it is not measured by the price of a single product.

What inflation actually measures

Inflation measures a broad change in prices. If the overall price level rises 3% over a year, that does not mean every item rose 3%. Some prices may rise much faster, some may be flat, and others may fall.

For households, the practical effect is purchasing power. If your income rises more slowly than the prices of the things you buy, your budget can feel tighter even if your nominal pay increased.

CPI: the most familiar inflation measure

The Bureau of Labor Statistics Consumer Price Index tracks changes in prices paid by urban consumers for a market basket of goods and services. CPI covers categories such as housing, food, transportation, medical care, recreation, education, and apparel.

In August 2026, BLS reported that CPI-U rose 0.4% on a seasonally adjusted monthly basis and 3.4% over 12 months. The monthly number is useful for recent momentum; the 12-month number is usually easier for households to interpret.

PCE: another major inflation measure

The Personal Consumption Expenditures price index is produced by the Bureau of Economic Analysis. It covers prices of goods and services purchased by consumers or on their behalf and uses a different methodology and weighting system from CPI.

The Federal Reserve generally emphasizes PCE inflation when describing its 2% longer-run inflation goal. BEA reported that the PCE price index was up 3.7% over the 12 months through July 2026.

Headline inflation vs. core inflation

Headline inflation includes the full basket. Core inflation excludes food and energy, categories that can swing sharply from month to month. Core measures can help analysts see underlying trends, but households still pay for food and energy, so headline inflation remains economically meaningful.

BEA reported core PCE inflation of 3.3% over the 12 months through July 2026.

Why your inflation rate may feel different

BLS explicitly notes that a national average rarely matches every household’s experience. Your personal inflation exposure depends on where your money goes. A renter in a fast-rising housing market, a household with high medical expenses, and a commuter buying a lot of gasoline can experience very different budget pressure even when the national CPI is the same.

That is why personal budgeting should use your actual spending categories rather than assuming the national CPI equals your personal cost increase.

Inflation does not mean prices must fall later

If inflation falls from 6% to 3%, prices are generally still rising—just more slowly. That is called disinflation. A broad decline in the price level is deflation, which is different.

How inflation affects financial decisions

• Cash: Inflation reduces the real purchasing power of money that earns less than the inflation rate.
• Wages: A pay raise can still represent a decline in real purchasing power if prices rise faster.
• Debt: The effect depends on whether rates are fixed or variable and on how inflation influences market interest rates.
• Savings: Compare the yield you earn with both taxes and inflation when thinking about real purchasing power.
• Business: Input costs, pricing power, wages, financing costs, and demand can all shift when inflation changes.

A practical inflation framework

When you see an inflation headline, check four things:

1. Which measure is it—CPI or PCE?
2. Is the number monthly or year-over-year?
3. Is it headline or core?
4. Which categories drove the change?

Then compare that national information with your own spending. That is more useful than treating one inflation number as a direct measure of your household budget.

Continue learning

Visit the Economy & Inflation hub for related explainers and the Economic Data Center for direct access to CPI and PCE releases.

Sources & methodology

• BLS — Consumer Price Index, August 2026
• BLS — CPI Frequently Asked Questions
• BEA — PCE Price Index
• BEA — Core PCE Price Index

Data are identified by reporting period because inflation statistics are revised and updated regularly.