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PMI, or Purchasing Managers’ Index, is a monthly survey-based signal of whether business conditions are improving, worsening or unchanged. Businesses can use it to revisit inventory and purchasing assumptions, but a national or sector PMI is not a forecast of any one company’s demand and should not dictate an order quantity.
What does PMI measure?
PMI summarizes business executives’ reports about changes in conditions, usually compared with the previous month. Depending on the publisher and report, surveyed topics may include new orders, output or business activity, employment, supplier delivery performance, purchasing, backlogs, inventories and prices. S&P Global describes measures across manufacturing and services, while the Institute for Supply Management (ISM) publishes separate U.S. manufacturing and services reports. See S&P Global’s PMI overview, its PMI FAQ and ISM’s PMI reports page.
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“PMI” does not identify a single universal series. When citing or using a reading, specify its provider, geography, sector, reference month and whether it is a headline index or a component such as new orders.
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How the ISM Manufacturing headline is built
For the ISM Manufacturing PMI, five component indexes—New Orders, Production, Employment, Supplier Deliveries and Inventories—are equally weighted in the composite, according to ISM’s 2026 methodology. This is a description of how the index is constructed, not a performance statistic. Other PMI products may use different components or methods.
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What does a PMI reading below 50 mean?
For the ISM Manufacturing PMI, a reading above 50 percent indicates that the manufacturing economy is generally expanding, while a reading below 50 percent indicates it is generally declining. The index is a diffusion measure: it reflects the breadth and direction of reported change, not the percentage change in output, sales or inventory. A reading of 52, for example, does not mean production grew 52 percent.
Interpret the headline alongside the components most relevant to your question. A softer headline can coexist with stronger new orders or slower supplier deliveries; those details may point to different planning concerns. The 50 threshold cited here applies to the ISM Manufacturing headline and should not be assumed to define every provider’s series in exactly the same way.
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How can businesses use PMI to plan inventory and purchasing?
Use PMI as a prompt to review assumptions and investigate the company’s own position—not as an automatic buy-or-cancel signal. S&P Global identifies monitoring inventory and price trends as uses of PMI data, and ISM describes its reports as guidance for supply-management and business leaders. Neither provides a universal conversion from a national PMI reading to a company order quantity.
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Outbyte PC Repair FREERepair Windows errors before they cause bigger problemsFix Now →Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →- Choose the relevant series. Start with the provider, geography and sector that most closely match the business or its suppliers. Check the reference month and distinguish the headline from components such as new orders, activity, inventories and supplier deliveries.
- If demand-related measures strengthen, review replenishment. Compare the signal with actual company orders and stock before changing forecasts, purchase commitments or supplier-capacity plans. A broad improvement can justify checking whether current assumptions still fit; it does not establish that your own demand will rise.
- If demand-related measures weaken, review exposure. Reassess planned purchase timing, excess-stock risk and carrying costs. Check firm customer orders and seasonal patterns before reducing or delaying replenishment, since those company-specific facts may differ from the broad signal.
- Read supplier delivery measures as a lead-time clue, not a simple demand verdict. Slower deliveries may reflect demand pressure or supply constraints. Either can affect lead times, so compare the signal with your suppliers’ actual performance before changing buffers.
- Reconcile decisions with internal data. Before acting, check company-level sales, on-hand and committed stock, open purchase orders, actual supplier lead times and service-level targets. These determine whether a change in the broad backdrop should alter a particular purchase.
How should you compare PMI readings?
Comparisons are meaningful only when the series and timing are aligned. Before interpreting a difference or trend, check:
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- Provider and methodology
- Geography and sector
- Reference month
- Headline index versus sub-index
- Seasonal-adjustment status
ISM specifies seasonal adjustment for selected component indexes, and its seasonal-adjustment announcement says annual updates took effect with the January 2026 reports. Treat differences between providers as possible methodology or sample-scope differences until verified; do not splice their readings as though they were one continuous, identical series. The S&P Global PMI FAQ provides additional context on its series.
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