What is CPI in trading?
In one line: CPI, the Consumer Price Index, measures how much the prices of everyday goods and services changed. In the US it's released monthly.
What it measures
Picture a big shopping basket: food, rent, gas, clothes, haircuts. CPI tracks how the cost of that basket changes. When the cost rises, that's inflation.
The US Bureau of Labor Statistics publishes it once a month at 8:30 am ET. The schedule is on bls.gov.
You'll see two main numbers:
- Headline CPI — the whole basket.
- Core CPI — the basket without food and energy, which jump around a lot.
A simple example
Forecasters expect prices rose 0.2% this month. At 8:30 am, the report says 0.3%.
That gap — the surprise — is what moves markets. A hotter number can make traders think interest rates will stay higher for longer, which often weighs on stocks. A cooler number can do the opposite. Neither reaction is guaranteed.
Stock futures and forex are trading at 8:30 am, so they move first. The stock market opens later, at 9:30 am, often with a gap.
Why it matters
CPI feeds straight into what the Fed's FOMC does with rates. That's why the release can bring big, fast candles and a wider spread for a few minutes. Our guide on how interest rates affect stocks explains the chain.
A common mistake
Trying to guess the number. Even if you guess right, the market's reaction can go either way. Traders often get whipsawed — stopped out one way, then the other.
A calmer plan: know the release time, stay flat through it, and wait for the first few candles after to settle before you look for a setup.
See CPI and FOMC days and how to read an economic calendar.
Questions
What time does CPI come out?
8:30 am Eastern Time, usually around the middle of the month.
What's the difference between CPI and core CPI?
Core CPI leaves out food and energy prices, which swing a lot, to show the steadier trend underneath.
Why do stocks fall when CPI is high?
Not always — but higher inflation can mean higher rates for longer, and that can weigh on stock prices.
Want the next step? We'll walk you through it.
Four free lessons by email, one every few days — each with a 10-minute exercise on a real chart.
Send Me the Free Lessons 4 short emails · No spam · Unsubscribe anytimeOr see the whole method, step by step:
See What’s Inside the Course Try everything free first. Decide when you're ready. · Open the free chart tool (works in the TradingView phone app)One chart idea a day, in plain English. Follow along: