U.S. CPI and PCE are different indicators that show changes in consumer prices, and they are not signals that determine the direction of Bitcoin prices. You need to read together how different the release is from expectations, whether core inflation and recent trends are moving in the same direction, and how expectations for interest rates, the dollar, and market liquidity consequently change. This article is an informational guide that organizes calculation examples and a verification sequence so that users in Korea and around the world can compare the same release using the same standards.
Data checked: September 16, 2026. Prepared by the CoinPop editorial team. The definitions and schedules of official statistics are distinguished from CoinPop’s market interpretation. Unless otherwise indicated, figures in the calculation tables are assumptions for educational purposes and are not current market forecasts or predictions of investment returns.
First, distinguish the differences between CPI and PCE
CPI is the Consumer Price Index compiled by the U.S. Bureau of Labor Statistics (BLS). The CPI-U most commonly cited in the news is based on the expenditures of urban consumers. The PCE price index is compiled by the U.S. Bureau of Economic Analysis (BEA) and covers not only direct household expenditures but also consumption expenditures made on behalf of households. Even when measuring U.S. inflation, the two figures do not need to be the same because their coverage, weights, and calculation methods differ.
| Category | CPI | PCE price index |
|---|---|---|
| Compiling agency | BLS | BEA |
| Primary coverage | Primarily direct expenditures by urban consumers | Includes consumption expenditures by and for households |
| Reasons for differences | Differences in calculation methods, item weights, expenditure coverage, and other adjustments | |
| Purpose of reading | Checking consumer price trends and the impact of a release | Checking consumption price trends and the benchmark for the Federal Reserve’s target |
| Invalid comparison | Mixing different reference months, month-over-month rates, year-over-year rates, or core measures in a comparison | |
The BEA explains the causes of the differences in terms of calculation methods, weights, coverage, and other effects. Therefore, calculations such as “PCE is always lower than CPI” or “PCE can be obtained by subtracting a fixed figure from CPI” cannot be used. Detailed definitions are available in the BEA’s explanation comparing CPI and PCE.
Headline and core inflation and the Federal Reserve’s 2% target
Headline inflation refers to price changes across all items, while core inflation refers to price changes excluding food and energy. Core indicators help examine trends by separating the effects of certain highly volatile items, but this does not mean that food and energy are unimportant to living expenses. Shocks to crude oil prices can also be transmitted to other items through transportation and production costs, so both indicators should be considered together.
The BEA’s definition of core PCE excludes food and energy. Meanwhile, the Federal Reserve’s explanation of its long-term inflation target uses the annual rate of change in the PCE price index as the basis for the 2% target. You should not directly link a different indicator to the target by saying, “Core CPI exceeded 2% this month, so the Fed will definitely raise rates at its next meeting.” The inflation target is not a formula that automatically determines interest rates every month.
How are month-over-month and year-over-year rates calculated?
Month over month (MoM) compares with the previous month, while year over year (YoY) compares with the same month of the previous year. The basic formula is (current index ÷ comparison-period index − 1) × 100. Before calculating, you must confirm that the indicator type, base year, and seasonal-adjustment status are the same. The BLS’s explanation of calculating rates of change distinguishes annual rates of change from values obtained by simply adding monthly rates of change.
| Educational assumption | Calculation | Interpretation |
|---|---|---|
| Index last month: 300; index this month: 300.9 | (300.9 ÷ 300 − 1) × 100 = 0.3% | The price level increased from the previous month |
| Index in the same month last year: 290; index this month: 300.9 | (300.9 ÷ 290 − 1) × 100 ≈ 3.76% | The price level increased from the same month last year |
| Expected MoM: 0.2%; actual: 0.3% | 0.3% − 0.2% = 0.1 percentage point | 0.1 percentage point higher than expected |
| Assumption that 0.3% per month continues for 12 months | ((1.003)^12 − 1) × 100 ≈ 3.66% | Annualized conversion based on the assumption; it is not the actual year-over-year rate or a forecast |
The monthly and annual indices in the table are examples for explaining the formula. In actual releases, the month-over-month rate may be presented on a seasonally adjusted basis and the year-over-year rate on a not-seasonally-adjusted basis, so one index must not be used directly in calculating the other. 0.1 percentage point is also different from 0.1%. For comparisons, it is generally more useful to record the difference from expectations in percentage points and avoid exaggerating it as a relative ratio, such as “a 50% surge.”
A slowdown in the inflation rate does not mean prices are falling
If the price rose from 100 to 105 last year, the increase rate was 5%. If it then rose from 105 to 108.15 the following year, the increase rate fell to 3%, but the price still increased. Disinflation, in which the pace of increases slows, must be distinguished from deflation, in which the price level falls. High living costs felt by consumers and a slowing inflation rate can coexist.
Year-over-year figures also incorporate the effect of last year’s prices, which serve as the comparison base. This is called the base effect. If a month in which prices surged last year drops out of the comparison base, the year-over-year rate may decline even if prices have continued to rise recently. Conversely, the year-over-year rate may rise when compared with a month that was exceptionally low last year. Do not look only at a “year-over-year decline” and conclude that a new easing trend has been established; also check the latest month-over-month changes and trends by category.
Easily overlooked points in seasonal adjustment and revisions
Seasonal adjustment is a statistical process used to separate the effects of recurring patterns, such as holidays, vacation seasons, and production cycles, in order to examine trends. It does not mean that the price changes that originally occurred are being concealed. The BLS explains the purpose and adjustment methods for its indicators in Seasonal Adjustment FAQ.
You must also distinguish whether the “previous figure” shown on the release screen is a value that was later revised. If the initially released figure and the revised figure are obtained from different data services, the same month may appear differently. Recording the reference period, download date, and adjustment status together can reduce unnecessary confusion. If data are missing or an official note states that a special estimation method was used, do not arbitrarily fill them with zero or a normal observed value.
CPI and PCE release times: For users in Korea and around the world
The month covered by a release and the actual release date are different. For example, August inflation may be released in September. Do not look only at a title such as “September CPI”; record the reference month and release date separately. Check the CPI at the official BLS schedule, and the PCE at the official BEA release schedule. PCE inflation must be found in the Personal Income and Outlays data, and the growth rate of personal consumption expenditures must not be confused with the growth rate of the price index.
| When the official schedule is 08:30 Eastern Time in the United States | UTC | Korea and Japan: UTC+9 | China and Hong Kong: UTC+8 |
|---|---|---|---|
| U.S. Eastern Daylight Time, EDT, UTC−4 | 12:30 | 21:30 | 20:30 |
| U.S. Eastern Standard Time, EST, UTC−5 | 13:30 | 22:30 | 21:30 |
The table above converts times on the assumption of 08:30 ET; it does not indicate a fixed release time for all economic indicators. In Europe and other regions, the dates when daylight saving time begins and ends may differ from those in the United States, so check the conversion to local time. Schedules may also change, and releases may be delayed. Check whether the calendar service’s default time zone is Korea or the United States, and use the issuing institution’s announcement as the final authority.
Reading the actual release: The August 2026 CPI example
In the August 2026 CPI data released by the BLS on 2026-09-11, overall CPI-U rose 0.4% month over month on a seasonally adjusted basis and 3.4% year over year on an unadjusted basis. The index excluding food and energy rose 0.3% month over month and 2.4% year over year. The same data also show that seasonally adjusted and unadjusted month-over-month changes can differ.
These four figures are observed official statistics. We do not add market expectations that have not been separately verified or Bitcoin’s price reaction at the time. Therefore, these data alone cannot support the conclusions that “the figure was higher than expected” or that “Bitcoin fell because of this release.” The purpose of this example is to demonstrate how to separate the four cells of headline versus core and month-over-month versus year-over-year figures. Once subsequent releases are published, this example should be read as a historical case.
How inflation indicators are transmitted to Bitcoin
The following is CoinPop’s conditional interpretation and does not claim that a causal relationship has been established for any specific release. If inflation comes in stronger than expected, the market may delay the timing of interest-rate cuts or price in the possibility that high rates will persist. Changes in the opportunity cost of dollar funding and the required return on risky assets may also affect demand for Bitcoin. However, bond yields, the dollar, stocks, and Bitcoin also respond to other information and positioning, so they do not always move in the same sequence.
Conversely, even if slowing inflation is confirmed, risk aversion may be stronger if it occurs alongside recession concerns. To avoid making judgments based solely on interest-rate expectations, you can also consult How to Read U.S. Employment Indicators: NFP, Unemployment, Wages, and Revisions. The difference between monetary policy and actual funding conditions is examined further in Guide to Treasury Bonds, Dollar Liquidity, TGA, ON RRP, and the Federal Reserve’s Balance Sheet.
Factors specific to Bitcoin, such as ETF fund flows, exchange outages, large-scale liquidations, and the depth of buy and sell orders, may overwhelm macroeconomic signals. Do not determine causation solely from the temporal association that the price moved immediately after an inflation indicator was released. At a minimum, match the official release and related market reaction occurring at the same time, and check whether any other event took place.
How to divide optimistic, neutral, and risk scenarios
| Conditional scenario | Evidence to check together | Limits of the interpretation |
|---|---|---|
| Slowing inflation and economic stability | Easing core trends and no sharp deterioration in employment | Easing expectations may already be reflected in prices |
| Mixed headline and core indicators | Component categories such as energy, services, and housing | It is difficult to determine the policy direction based on a single figure |
| Persistent inflationary pressure | Trends over several months and reactions in interest rates and the dollar | High inflation does not guarantee a decline in Bitcoin |
| Slowing inflation and a sharp economic contraction | A simultaneous deterioration in employment, consumption, and credit conditions | Expectations of rate cuts and risk aversion may emerge simultaneously |
This table is not a probability forecast or a buy/sell recommendation. It is a tool that makes assumptions explicit so that interpretations can be revised when contrary evidence emerges. Estimates in the economic calendar are the results of surveys or models, not confirmed facts announced by institutions. Because survey samples and update times may differ by provider, when citing an estimate, record the provider and the time of recording as well.
What should each type of user check?
Spot long-term holders need to distinguish trends over several months from the timing of their own cash needs, rather than focusing on a single announcement. A slowdown in inflation does not mean that the risk of asset-price volatility has disappeared. Leverage users should check the actual execution conditions for margin requirements, liquidation conditions, outstanding orders, and stop-loss orders, regardless of whether their outlook proves correct. During periods of sharp volatility, trades may not execute at the desired price, and losses may be greater than expected.
Investors using a non-dollar reference currency, such as those in Korea distinguish Bitcoin's dollar price from the exchange rate of their reference currency. Even if the dollar-denominated price remains the same, the valuation expressed in the local currency changes because of exchange-rate movements. Readers citing information can more easily compare articles and figures in other languages by recording the URL of the original announcement, the reference month, whether the data are seasonally adjusted, and the date of verification. The availability of trading and applicable taxes and regulations vary by country and require separate verification; this article does not substitute for authorization to use a service or for tax advice.
Checklist for Reviewing Information Before and After an Announcement
- Check the reference month, announcement date, time zone, and any change notices in the official schedule.
- Record four distinctions: whether it is CPI or PCE, headline or core, month over month or year over year.
- When using an estimate, record the provider and time of recording, and keep it separate from the official observation.
- After the announcement, check the units, seasonal adjustment, revisions, and treatment of missing data in the original tables and notes.
- Compare recent trends and major component items on a consistent basis.
- Consider interest rates, the dollar, employment, liquidity, and Bitcoin-specific events together, and do not attribute the outcome to a single cause.
- Record the interpretation separately as fact, assumption, and uncertainty, and verify it again at the next official announcement.
Frequently Asked Questions
Will Bitcoin rise if CPI comes in low?
It is not guaranteed. The difference from expectations, expectations already priced in, economic concerns, market positioning, and other events all play a role. “Lower than the previous month” and “lower than expected” are also different comparisons.
Are PCE and personal consumption expenditures the same figure?
No. Changes in expenditure amounts may reflect changes in both prices and consumption volumes. To interpret inflation, verify the exact series name, such as the PCE price index; to interpret real consumption, verify a series such as real PCE.
Is it enough to look only at core inflation?
No. Core indicators help with trend analysis, but they do not replace headline inflation or the burden of living costs. Consider headline and core measures together with their component items.
If I multiply the month-over-month rate by 12, is that the year-over-year rate?
No. Simply multiplying by 12 is a rough annualized conversion, whereas the year-over-year rate compares the index with that of the same month in the previous year. An annualized compound-rate conversion assuming the same monthly pace continues is not an actual forecast of the future either.
Why does the announcement time in Korea differ by one hour?
Because the United States' Eastern Time may or may not be observing daylight saving time. In Korea, check whether the relevant U.S. schedule uses EDT or EST, as well as the date, before converting the time.
Is this article guidance on buying or selling after this announcement?
No. It is educational content for interpreting official statistics and verifying source materials. Bitcoin and derivatives involve a significant risk of loss, and there is no single trading action that is suitable for everyone.
Sources, Verification Scope, and Conflict-of-Interest Disclosure
Statistical definitions, formulas, and release schedules were verified based on the BLS, BEA, and Federal Reserve materials directly linked above. For the August 2026 CPI figures, we used an official release with a fixed date. CoinPop prepared the calculation examples directly, and minor display differences may result from decimal rounding. The market transmission channels and scenarios are editorial analysis and do not guarantee actual causal relationships, price direction, or returns.
CoinPop may receive affiliate revenue from certain exchange-related documents. This article does not include a direct signup referral CTA, and the evidentiary links for the statistics lead to the original sources from official institutions. If figures appear different, including in an automatically translated version, first check the relevant official source, reference month, and units. Policies and schedules may change, so check the latest announcements when actually using the information.