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Industry-level demand forecasting estimates purchases across a defined market rather than one company's sales. This guide shows how market assumptions, segment growth and company share connect, with a worked example and checks that keep the forecast scope consistent.
Industry level demand forecasting estimates purchases across a defined market, while a company forecast estimates the sales one business expects to capture. Connect the two with an explicit market-share assumption rather than treating market growth as the company's automatic growth rate. The useful result is a checked set of planning assumptions, not a claim about the current economic outlook.
A market forecast needs a product definition, geography, customer group, measurement unit and period. Write those into the planning file. A forecast of US replacement demand is different from a forecast of worldwide production, even if both refer to the same broad product family.
Decide whether the measure is end-customer purchases, manufacturer shipments or another point in the commercial chain. Counting the same item when it leaves a manufacturer and again when a distributor sells it inflates the market. Define company sales on the corresponding basis before calculating share.
The general demand forecasting guide covers methods for estimating demand. This page addresses the forecast's scope and its connection to a company plan. An estimate of the total market does not replace the more detailed SKU-level demand forecast used to allocate inventory or production.
Government series can inform the assumptions without being the market forecast itself. The Census Manufacturers' Shipments, Inventories, and Orders survey provides monthly information on domestic manufacturing activity. Its shipments, inventories and orders describe different business events; select the relevant measure rather than adding them into one demand total.
The Federal Reserve's industrial production description says its production index measures real output across manufacturing, mining and utilities. A production index can help assess activity, but it is not a dollar estimate of customer purchases in a narrowly defined market. Do not multiply company revenue by an index level and label the result market size.
For every outside assumption, retain the publication date, period covered, unit, geographic coverage and any adjustment applied. If the source covers a wider industry than the business serves, document the allocation used to reach the serviceable market. A precise-looking number does not remove that estimation uncertainty.
Consider a fictional US manufacturer planning replacement filter-cartridge sales. Its defined market is US end-customer replacement purchases during the next calendar year; new installations and exports are excluded. The market volumes and growth rates below are supplied planning assumptions, not published market statistics.
The company's net units delivered to those same customer groups use the same boundary. Within each group, company share is assumed to remain unchanged.
Forecast market units = Base market units × (1 + Market growth)
Forecast company units = Forecast market units × Expected company share
| Customer group | Base market units | Supplied growth | Forecast market units | Company share | Base company units | Forecast company units |
|---|---|---|---|---|---|---|
| Food service | 200,000 | 8.0% | 216,000 | 6.0% | 12,000 | 12,960 |
| Hospitality | 150,000 | 4.0% | 156,000 | 4.0% | 6,000 | 6,240 |
| Health facilities | 100,000 | -2.0% | 98,000 | 3.0% | 3,000 | 2,940 |
| Total | 450,000 | 4.4% | 470,000 | 21,000 | 22,140 |
Food service adds 200,000 × 8.0% = 16,000 market units. Hospitality adds 150,000 × 4.0% = 6,000, while health facilities subtract 100,000 × 2.0% = 2,000. Those changes sum to 20,000, taking total market demand from 450,000 to 470,000 units.
Total market growth is 20,000 / 450,000 = 4.4%, rounded to one decimal place. Do not average the three segment growth rates: their starting market sizes differ.
The company's segment changes are 960, 240 and -60 units. Their sum is 1,140, so forecast company sales are 21,000 + 1,140 = 22,140 units. Company growth is 1,140 / 21,000 = 5.4%, rounded to one decimal place. It exceeds market growth because the company has greater exposure to the faster-growing group, even though no segment gains share.
Two identities prove the example. The segment forecast volumes must sum to the market forecast, and the segment company forecasts must sum to the company plan:
| Check | Calculation | Result |
|---|---|---|
| Market forecast, units | 216,000 + 156,000 + 98,000 | 470,000 |
| Company forecast, units | 12,960 + 6,240 + 2,940 | 22,140 |
| Company volume bridge, units | 21,000 + 960 + 240 − 60 | 22,140 |
| Base aggregate company share | 21,000 / 450,000 | 4.67% |
| Forecast aggregate company share | 22,140 / 470,000 | 4.71% |
Aggregate shares are rounded to two decimal places. Their movement reflects changing segment weights, even with each segment's share held constant. This is why a total share comparison alone cannot prove a competitive gain.
If company sales include distributors or related accounts, confirm that the customer grouping counts each sale once. The account hierarchy guide explains how parent and subsidiary definitions affect that reporting boundary.
Now reduce the food-service company share from 6.0% to 5.5%, leaving every market volume and other share assumption unchanged. Food-service company demand becomes 216,000 × 5.5% = 11,880 units.
The revised company total is 11,880 + 6,240 + 2,940 = 21,060 units. That is 1,080 below the original 22,140-unit company plan, while the industry forecast remains 470,000 units. The change belongs to company share, not to market growth.
Commercial leadership owns the evidence for the share change: account losses, channel coverage or a revised competitive assumption. Strategy or market research owns the market boundary and external assumptions. Finance checks their combination, and operations uses the resulting company volumes to assess capacity.
When actuals arrive, preserve both the market forecast and the company-share assumptions. Update each separately so the review distinguishes an incorrect market assumption from a company execution gap. For recurring local misses, forecast bias by SKU and site addresses a narrower operational diagnosis.
Bring a sample of your own market-assumption file and company sales export as a file or Google Sheet. Covirage maps the columns, its tools compute and check the comparisons, and the external AI model explains the results with every figure traced to its rows. Create a free Covirage account, which takes about a minute, then set up your business and bring your file.
See forecast analysis for the supporting planning context.
Industry demand covers all suppliers serving the defined market. Company demand is the portion expected to be served by one business. A company can grow faster than its market by gaining share, or slower by losing share, even when the underlying market estimate is correct.
Use sources that match the market definition, such as industry shipments, customer purchasing data, end-use activity and company channel evidence. Note whether each source measures units, dollars, orders or production. These measures can inform assumptions, but they should not be added together as though they measured identical purchases.
Only if the company expects its market coverage, segment mix and share to remain consistent with that assumption. Build the company plan by segment when growth differs across customer groups. Otherwise a single market rate can conceal a company's exposure to faster or slower segments.