What CPI is
The consumer price index (CPI) tracks the average change in prices that households pay for a fixed basket of goods and services. When the index rises, the same basket costs more, and that rise is what most people call CPI inflation. For the wider concept, see Inflation explained.
Every major economy publishes a CPI. In the United States the Bureau of Labor Statistics (BLS) compiles it. In Pakistan the Pakistan Bureau of Statistics publishes national CPI data. Each country uses its own method, so you cannot compare the figures directly.
- Inflation (CPI) comes out above the forecast.
- The market expects the central bank to keep rates high or raise them.
- Bond yields rise with those expectations.
- The currency often strengthens; inflation below the forecast usually works the other way.
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How CPI is measured
Statistical agencies follow the same basic steps:
- Basket. Household spending surveys show what people buy: food, rent, transport, fuel, clothing, medical care, education and other items.
- Weights. Each category gets a weight based on its share of spending. Housing costs carry a large weight in US CPI. Food carries a large weight in many emerging economies, including Pakistan.
- Price collection. Staff record prices for specific items in shops, online and from service providers across many cities, every month.
- Quality adjustment. If a product improves, the agency tries to separate the price change from the quality change.
- Index calculation. Prices are combined using the weights into one index level. The level is compared with a base period.
The report gives two main change figures:
- Month-over-month (m/m): change from the previous month, often seasonally adjusted.
- Year-over-year (y/y): change from the same month a year earlier.
The m/m figure shows current momentum. The y/y figure is what central banks usually quote against their inflation targets.
Headline vs core CPI
| Measure | What it includes | Why it matters |
|---|---|---|
| Headline CPI | The full basket | What households actually feel |
| Core CPI | Excludes food and energy | Shows the underlying trend with less noise |
Food and energy prices swing with weather, harvests and oil markets. These swings can hide the trend, so central banks watch core inflation closely. Energy shocks can still pass into core over time through transport and production costs. See Oil and inflation for how that works.
Experienced traders also look at the components. In US CPI these include shelter, services excluding shelter, used cars and airline fares. Two reports with the same headline figure can mean different things for policy, depending on which parts drove the change.
The US CPI release
US CPI is one of the most closely watched data releases in global markets. The reason is that it shapes expectations for Federal Reserve policy. Key points:
- Schedule. The BLS publishes CPI monthly at a set time in the US morning. Take the exact dates and times for the year from the official BLS release schedule. Do not rely on memory or third-party lists, because dates can move, for example after a government shutdown.
- Reference month. Each report covers the previous calendar month.
- Revisions. Unadjusted CPI is generally not revised. Seasonal factors are updated periodically, which can change earlier seasonally adjusted figures.
- Related data. The Fed's preferred gauge is PCE inflation. CPI comes out earlier and feeds into PCE estimates. See PCE inflation and Producer Price Index.
Economic calendars show the release together with a consensus forecast (the median of economists' expectations) and the previous figure. Our Economic calendar guide explains how to read these columns. On this site, data figures should come only from official feeds and releases.
Why markets react to CPI
Markets do not react to whether inflation is "high" or "low". They react to the difference between the actual figure and what was expected. Price moves before the release reflect the consensus already. The surprise is what moves prices. See Economic surprises for more on this.
The usual chain of reasoning runs like this:
- A CPI figure above expectations suggests inflation is more persistent.
- Traders raise expectations of tighter policy: higher rates, or rate cuts arriving later. This view is called hawkish (see Hawkish vs dovish).
- Short-term Treasury yields tend to rise.
- Higher yields often support the US dollar. They can weigh on gold, which pays no interest, and on rate-sensitive stock indices such as NAS100.
A figure below expectations often produces the opposite pattern. These are typical tendencies, not rules.
The reaction can differ or reverse when:
- headline and core point in different directions,
- the m/m and y/y figures send mixed signals,
- markets already priced in a surprise through earlier data, or
- risk sentiment or geopolitics dominates on that day.
Related pages: US Federal Reserve, Interest rates, Real interest rates, What moves gold, US Dollar Index.
CPI news trading: what changes around the release
"CPI news trading" refers to activity around the release itself. This page gives no trade ideas, but you should understand the conditions at that time:
- Spreads widen. The spread is the gap between bid and ask, and it often widens sharply in the minutes around the release.
- Slippage. Orders can fill at prices worse than requested when prices jump.
- Gaps through stops. A stop-loss limits losses but does not guarantee the exit price in a fast market.
- Whipsaw. The first move can reverse within minutes as traders read the components.
Leveraged forex and CFD trading can lose money fast, and data releases increase that risk. Read Risk management before trading around any release.
For Pakistani residents, there is also a legal side. Per the SECP, offshore forex/CFD platforms operate without regulatory approval in Pakistan. Also, per the SECP, offshore platforms have no Pakistani licence or oversight and offer no legal protection or recourse. See Law and regulators for details.
CPI and Pakistan
Pakistan's CPI feeds into the State Bank of Pakistan's monetary policy decisions. The latest decision on record: SBP policy rate raised by 50 bps to 12% with effect from 27.10.2026 (MPC). For how SBP decisions connect to the rupee and the economy, see SBP rates and economy and SBP exchange rates.
Frequently asked questions
What is the difference between CPI and inflation?
CPI is an index of consumer prices. Inflation is the rate at which that index rises over a period, usually measured month-over-month or year-over-year.
Why do central banks focus on core CPI?
Core CPI excludes volatile food and energy prices, so it gives a clearer view of the underlying trend that policy can influence.
Where can I find the US CPI release date?
In the official BLS release schedule. Economic calendars copy these dates, but the official schedule is the reference.
Does a high CPI figure always strengthen the US dollar?
No. The market reacts to the surprise against consensus and to the details of the report, and other factors can outweigh it on the day.
Is CPI the same in every country?
No. Baskets, weights and methods differ between countries, so you should compare trends within a country rather than raw figures across countries.
Is trading around CPI riskier than at other times?
Usually, yes. Spreads can widen, slippage increases and prices can reverse quickly. With leverage, losses can build fast.