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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11A PMI can rise while still signaling contraction. For the measured index, a reading below 50 means conditions worsened compared with the previous month; a rise from 44 to 48 means that deterioration is easing, not that growth has returned. The index signals improvement in the month-to-month direction only once it moves above 50.
What a PMI reading below 50 means
A Purchasing Managers’ Index (PMI) is a diffusion index built from survey responses about whether business conditions improved, stayed the same, or worsened compared with the previous month. For the conventional activity interpretation, 50 is the no-change boundary: below 50 indicates deterioration, while above 50 indicates improvement in the particular measure.
As S&P Global puts it, “Readings below 50.0 signal a deterioration or decrease on the previous month.” S&P Global’s PMI FAQ explains the threshold and calculation.
Why a rising PMI can still mean contraction
The PMI’s direction and its position relative to 50 answer different questions. The direction tells you whether the index is rising or falling versus its previous reading. Its position tells you whether the survey still indicates deterioration or instead indicates improvement.
| Reading pattern | Interpretation |
|---|---|
| 44 to 48 | The index is rising, but remains below 50: contraction is easing, not growth. |
| 48 to 50 | The index is rising toward the no-change boundary; at 50, the index indicates no change. |
| 48 to 52 | The index has crossed above 50 and signals improvement in the measured conditions compared with the prior month. |
| 56 to 53 | The index remains above 50, so conditions are still improving, but the rate of improvement signaled by the index has slowed. |
These patterns describe the measured survey index, not necessarily the whole economy. To say that a particular sector, output measure, or economy has returned to growth, identify the exact PMI series and the activity it measures.
How to read the number without treating it as a growth rate
In S&P Global’s method, the percentage of respondents reporting “higher” is added to half the percentage reporting “the same”; “lower” responses contribute zero. The resulting index ranges from 0 to 100. The distance from 50 indicates the rate of change signaled by the diffusion index: a wider gap means a stronger balance of reports in one direction.
That does not make the PMI a percentage change in output. A reading of 48 does not mean output fell by 2 percent. It summarizes the breadth and direction of survey responses, not the size of each business’s change.
Check which PMI and component you are reading
Publisher, geography, sector, and measure
“PMI” is not one interchangeable series. Read the publisher, geography, sector, and component name alongside the number. Surveys can cover output, new orders, employment, prices, exports, purchasing activity, supplier performance, backlogs, and inventories. S&P Global also asks about expected output a year ahead; that separate forward-looking question is not the headline PMI’s current-month reading. Its guide to the headline PMI and its subindices also cautions that its manufacturing headline is a broad business-conditions barometer, not a direct measure of manufacturing output growth. For an output claim, use the output index.
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Headline indexes can hide different component moves
For the ISM U.S. Manufacturing PMI, the headline combines New Orders, Production, Employment, Supplier Deliveries, and Inventories with equal weights. Supplier Deliveries is interpreted in reverse: a reading above 50 means deliveries are slower, which ISM says is typical when activity and customer demand improve. Check a component’s definition before interpreting its direction as good or bad.
ISM’s 47.5 GDP benchmark is not a new PMI boundary
ISM uses 50 as the boundary between expansion and contraction for its Manufacturing PMI. Separately, it says that a Manufacturing PMI above 47.5 over a period of time generally indicates overall U.S. GDP expansion, based on the historical relationship between the manufacturing index and GDP. The 47.5 benchmark does not mean that a manufacturing PMI reading below 50 signals manufacturing expansion; it is a distinct, economy-wide GDP relationship, not the survey’s no-change line. See the September 2026 ISM Manufacturing PMI Report for ISM’s explanation.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.A dated example: ISM manufacturing in September 2026
ISM reported its U.S. Manufacturing PMI in expansion territory for September 2026. The Production Index was 56.7, down from 58.3 in August. Because 56.7 remained above 50, it still signaled improving production conditions; its decline showed that the pace of improvement indicated by the index had eased. In the same report, New Orders and Employment grew faster than in the previous month, illustrating how components can move differently from one another.
ISM also reported that 2 percent of manufacturing GDP contracted in September, compared with 22 percent in August, and defined “strong contraction” in that report as a composite PMI of 45 or lower. These are figures and a definition specific to ISM’s September 2026 report, not general thresholds for every PMI series or the economy as a whole. ISM describes its seasonal adjustment process on its Seasonal Adjustment Factors page.
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