What does PMI measure, and what does a reading above 50 mean?
PMI describes the balance of changes reported by surveyed businesses. Identify the publisher, sector and measured variable before interpreting the headline or comparing two releases.
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PMI is a survey-based diffusion index, not a GDP growth rate. For an activity index, readings above 50 indicate a positive balance of reported changes from the previous month. Manufacturing, services and composite headlines can use different calculations, even when all are called PMI.
What to check first
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What not to infer
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Businesses report whether a variable such as output, orders or employment increased, stayed the same or decreased relative to the previous month. A diffusion index summarizes the breadth of these changes, not their monetary size. Panel coverage, industry weights and question wording belong to a particular publisher. A manufacturing survey therefore cannot stand in for the whole economy or an individual company's accounts.
The basic calculation is the percentage reporting an increase plus half the percentage reporting no change. Fifty can result from offsetting increases and decreases; it does not mean every business was unchanged. An activity index can fall while remaining above 50, indicating a slower pace of expansion rather than contraction. A prices index concerns price changes, while a delivery-times index concerns supplier speed: higher is not universally better.
In a simplified equally weighted activity survey, 40% report increases, 40% no change and 20% decreases. The index is 40 + 0.5 × 40 = 60, before any seasonal adjustment. Only 40% reported increases, not 60%. The result does not mean GDP grew 10%. This arithmetic example contains no current economic observation or market price. Actual surveys also have sampling and weighting rules.
ISM Manufacturing PMI combines five equally weighted component indices; ISM Services PMI combines four. S&P Global's manufacturing headline uses five components with different weights, whereas its services headline is the Business Activity Index. Its Composite Output Index combines manufacturing output with services business activity using sector-value-added weights, rather than averaging the two headline PMIs. The linked methodology sections explain these constructions; equal component weights do not imply equal respondent weights.
S&P Global publishes early flash estimates for certain countries and sectors using an incomplete response set, followed by fuller releases. The response share and release dates are report-specific. This sequence should not be applied automatically to ISM. A flash-to-final difference and a later change in seasonal factors are separate issues. Keep the observation month, publication date, release version and adjustment basis beside a saved reading.
Start with the same named series, country and sector, then compare the same release versions and seasonal-adjustment basis. Read orders, activity, employment, prices and deliveries separately before summarizing the headline. Publisher methodology supports interpretation of the survey, not a predetermined currency or equity reaction. The references were checked in September 2026; ISM month-name pages can roll forward, so their report year also matters when revisiting the source.
Record publisher, country, sector and variable. Manufacturing PMI and manufacturing output are not interchangeable labels.
Keep the data version
Record the reference month, release date, flash or final status and seasonal adjustment. An undated screenshot cannot establish a comparable series.
Separate data from action
A survey helps explain reported business conditions. It does not identify a suitable trade, position size or expected return for the reader.
Related guides
Each page helps readers understand a distinct topic and does not replace independent review. Market pages use real or cached-real quote data only. Content is educational and not investment advice.
Macro-event market context guides. Each page helps readers understand a distinct topic and does not replace independent review. Market pages use real or cached-real quote data only. Content is educational and not investment advice.
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Does PMI of 60 mean that 60% of businesses expanded?
No. The calculation includes half the share reporting no change. In the fictional example above, only 40% report increases even though the index is 60. It is not a GDP growth percentage either.
Can a lower PMI still indicate expansion?
Yes, for an activity index that remains above 50. Its change since the previous reading and its position relative to 50 answer different questions. Check the measured variable before extending that interpretation to other subindices.
Are ISM Services PMI and S&P Global Services PMI identical?
No. ISM uses a four-component composite, while S&P Global's headline services measure is its Business Activity Index. Survey panels and sector coverage can differ too.
Does every PMI have a flash estimate?
No. The flash/final sequence applies to particular publisher series. The linked S&P Global report describes its own early response set and subsequent release dates, not a universal schedule for all PMI surveys.
Do I need a trading platform to read PMI pages?
No. This guide is public. Optional first-note signup uses email verification, with no broker account, deposit or platform connection. Educational market notes are not instructions to trade a PMI release.
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Educational content only. Not investment advice, not trading instructions, and not a result claim.