The Tool Desk
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What PMI and industrial production measure
ISM Manufacturing PMI: reported direction
The U.S. ISM Manufacturing PMI is a diffusion index built from five equally weighted indexes: New Orders, Production, Employment, Supplier Deliveries, and Inventories. ISM surveys supply and purchasing executives each month about changes in their organizations’ U.S. operations. For most components, the index reflects the share reporting improvement plus half the share reporting no change. Supplier Deliveries is interpreted in reverse: slower deliveries push its index higher. The result indicates the breadth and direction of reported change, not the percentage change in national output. ISM explains the survey and its indexes.
Federal Reserve IP: estimated real output
The Federal Reserve’s industrial production index measures real output in manufacturing, mining, and electric and gas utilities. It is an estimate assembled from multiple source series: monthly industry indexes use physical-output data where available and appropriate, and input measures to infer output for some industries. Its coverage is broader than the manufacturing-only ISM PMI. The index is expressed relative to a base year, so its level is not a PMI-style expansion threshold. See the Federal Reserve’s G.17 industrial production release for definitions, data, and release information.
How to interpret the numbers
- PMI above or below 50: ISM’s central line for manufacturing is 50. A reading above 50 generally signals expansion in the sector; below 50 generally signals contraction. It does not mean output grew or fell by that percentage.
- ISM’s 47.5 reference: ISM has said a Manufacturing PMI above 47.5 over a period of time generally indicates overall U.S. economic expansion. This is an ISM historical relationship to overall GDP, not the manufacturing-sector threshold and not an IP threshold.
- IP levels and changes: Read IP through changes in the relevant output index and its components. Do not apply PMI’s 50 cutoff to IP.
- Production Index and IP: ISM says Production Index readings above 52 over time are generally consistent with an increase in Federal Reserve IP. This is a relationship across time, not a conversion formula or a guarantee about any particular month.
Because one series records survey respondents’ direction and the other estimates output, their values are not directly comparable. A PMI reading of 54, for example, does not mean production rose 4 percent.
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Which indicator to use for a business decision
| Business question | Useful series | How to apply it |
|---|---|---|
| Are manufacturing demand and the order pipeline improving? | ISM New Orders and Backlog of Orders | Treat them as respondent-based directional signals. Check them against your own bookings, cancellations, and customer forecasts. |
| Is manufacturing production turning up or down? | ISM Production first; Federal Reserve manufacturing IP for output context | Use the survey as an earlier signal and compare it with the output estimate when released. ISM’s above-52 relationship is a longer-run indicator, not a one-month promise. |
| Are suppliers facing delivery pressure? | ISM Supplier Deliveries | A reading above 50 indicates slower deliveries, not faster output. Use it to frame questions about lead times and supply constraints. |
| Are inventories building or being drawn down? | ISM Inventories, alongside company inventory records | The index captures survey reports of direction, not a national inventory quantity. Compare the signal with your own stock, sell-through, and replenishment data. |
| How is the broader industrial sector performing? | Federal Reserve IP | Review manufacturing, mining, utilities, or the relevant industry and market-group series rather than relying only on the aggregate if your exposure is concentrated. |
| What is the broad macroeconomic direction? | PMI and IP, with other economic data | Use them as complementary indicators. ISM advises comparing its data with other economic sources when making decisions. |
Timing, scope, and revisions
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 not a substitute for the later output estimate. Preliminary IP figures can be revised as additional monthly data arrive and during annual revisions. Check the current G.17 release for the latest values, base-year information, and revision status before using a quoted IP figure. The Federal Reserve’s release page describes its data and revision process: G.17 industrial production.
The comparison is U.S.-specific: the ISM survey and Federal Reserve series measure U.S. activity. Businesses operating in other countries should use the relevant national PMI and industrial-output sources instead of assuming these thresholds and release calendars apply.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.A dated example: September 2026
ISM reported a September 2026 Manufacturing PMI of 54.5, down 0.1 percentage point from August’s 54.6. The September New Orders Index was 55.3 and the Production Index was 56.7. These are diffusion-index readings, not growth rates in physical output. ISM reported that the overall economy continued in expansion for the 23rd month in a row. The figures describe the survey reference month; they should not be presented as September IP results. ISM’s report and methodology.
Quick Recap
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A practical monitoring routine
- Match the data to your exposure. Decide whether you need manufacturing demand, production, supplier conditions, or a broader industrial measure that includes mining and utilities.
- Read the relevant PMI components. Use New Orders and Backlog for pipeline direction, Production for the survey’s production signal, Supplier Deliveries for delivery conditions, and Inventories for reported inventory direction.
- Compare like periods. Note the survey reference month and the IP period, and avoid comparing a PMI release with an IP figure for a different period as if they described identical conditions.
- Check IP revisions and detail. Use the latest G.17 release, look at the industry series relevant to your business, and note whether the cited figure is preliminary or revised.
- Validate against operating data. Compare the macro signals with your own orders, shipments, lead times, production, and inventory measures before changing forecasts or plans.
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