Businesses should watch both, but for different signals. The U.S. ISM Manufacturing PMI offers an early, survey-based read on the direction of manufacturing conditions; Federal Reserve industrial production (IP) estimates realized output across manufacturing, mining, and electric and gas utilities. Use PMI to monitor changes in orders, production, suppliers, and inventories, then use IP to assess measured output. Neither index is a substitute for the other, and their values are not directly comparable.
What the PMI and industrial production measure
ISM Manufacturing PMI: reported direction of change
The U.S. ISM Manufacturing PMI is a diffusion index compiled from monthly responses by supply and purchasing executives about changes in their organizations’ U.S. operations. It combines five equally weighted indexes: New Orders, Production, Employment, Supplier Deliveries, and Inventories. For most components, the calculation reflects the share reporting improvement plus half the share reporting no change. Supplier Deliveries is interpreted in reverse: slower deliveries raise that index.
Because the PMI summarizes whether conditions improved, worsened, or stayed the same, it is not a measure of how much national output changed. ISM describes its diffusion indexes as having leading-indicator properties, but they remain survey signals rather than direct output measurements. ISM’s PMI explanation and report sets out the methodology and interpretation.
Federal Reserve IP: estimated real output
The Federal Reserve’s industrial production index estimates real output in manufacturing, mining, and electric and gas utilities. Monthly industry indexes draw on physical-output data where available and appropriate, and on input measures to infer output for some industries. IP is therefore a compiled estimate, not a survey of business sentiment. Its coverage is broader than the manufacturing-only ISM PMI. See the Federal Reserve’s G.17 Industrial Production and Capacity Utilization release for the series and methodology.
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How to read the numbers without confusing them
PMI’s 50 line is not an output-growth rate
For the ISM Manufacturing PMI, a reading above 50 generally signals expansion in the manufacturing sector; a reading below 50 generally signals contraction. The reading does not mean output rose or fell by that percentage. ISM has also said that a Manufacturing PMI above 47.5 over time generally indicates overall U.S. economic expansion. That 47.5 figure describes an observed historical relationship with the broader economy; it is not the manufacturing-sector threshold or a threshold for Federal Reserve IP.
ISM says its Production Index readings above 52 over time are generally consistent with an increase in Federal Reserve industrial production. This is a relationship across time, not a conversion formula or a guarantee about any individual month.
IP is an index, not a diffusion threshold
IP is expressed relative to a base year. Interpret it by examining changes in the relevant output series, not by applying PMI’s 50 line. Do not compare a PMI reading of 54 with an IP index level as though both represented the same percentage or unit.
Which indicator fits each business question?
| Business question | Useful indicator | How to apply it |
|---|---|---|
| Are manufacturing orders and demand direction improving? | PMI New Orders and Backlog of Orders | Use them as respondent-based directional signals, then check them against your own order book, customer activity, and market exposure. |
| Is manufacturing production moving up or down? | ISM Production Index, then Federal Reserve IP manufacturing data | PMI gives an earlier survey signal; IP helps assess estimated realized output when released. The relationship is not one-for-one. |
| Are suppliers facing delivery pressure? | PMI Supplier Deliveries | A reading above 50 means deliveries are slower, not that output is growing faster. |
| What is happening to inventory conditions? | PMI Inventories | Use it as context for reported inventory direction; pair it with company-level stock and demand data when making operating decisions. |
| How is industrial output changing beyond manufacturing? | Federal Reserve IP | Review the relevant industry or market-group series, since the aggregate includes mining and utilities as well as manufacturing. |
| What is the broad macroeconomic direction? | Both, alongside other economic data | Treat PMI as one timely signal and IP as an output estimate; ISM advises comparing its data with other economic sources when making decisions. |
Release timing and revisions matter
ISM publishes its manufacturing report on the first business day of the month after the survey reference month. The Federal Reserve generally publishes G.17 around the middle of the month. That timing makes PMI available earlier, but it does not establish a fixed lead time or prove that PMI predicts each IP move.
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Federal Reserve IP preliminary estimates can be revised as additional monthly data arrive and may change in annual revisions. Check the current G.17 release page before quoting a recent value or base year. The Federal Reserve page described an annual revision planned for autumn 2026; the revision’s published status and resulting values should be verified in the current release.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.A dated example: September 2026 PMI
ISM reported a September 2026 Manufacturing PMI of 54.5, down 0.1 percentage point from August’s 54.6. September’s New Orders Index was 55.3 and Production Index was 56.7. These are diffusion-index readings, not percentage growth rates in physical output. The September report’s same-month PMI figures are not themselves a same-month Federal Reserve IP result.
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Susan Spence, MBA, chair of ISM’s Manufacturing Business Survey Committee, said in the September 2026 report: “The Manufacturing PMI® registered 54.5 percent in September, 0.1 percentage point below the August figure of 54.6. The overall economy continued in expansion for the 23rd month in a row.”
Quick Recap
A practical monitoring rule
- Start with the PMI headline and the subindex tied to your question: New Orders for pipeline direction, Production for reported manufacturing activity, Supplier Deliveries for delivery conditions, or Inventories for inventory context.
- When the Federal Reserve releases G.17, compare the relevant IP industry or market-group series over time rather than comparing its index level with the PMI number.
- Check both against your own orders, production, supplier lead times, and inventory data before changing forecasts or operating plans.
- For businesses outside the United States, use the relevant national PMI and industrial-output series. The thresholds and coverage described here apply to the U.S. ISM survey and Federal Reserve IP.
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