What Is a Demand Forecast in Production Planning? EDGEBIC Definition

A demand forecast in production planning is a planner-entered expected demand quantity for a product in a future time bucket, such as 400 units of Widget A in July, used to prepare the plan for sales that are anticipated but not yet ordered. It is a stored, considered estimate that feeds the inventory projection alongside firm orders, letting the plan look past today's order book and get ahead of demand a planner reasonably expects to see.

This entry is part of the EDGEBIC by User Solutions glossary series; for the broader vocabulary of planning, see the manufacturing glossary. A forecast is one kind of demand input, so read it next to what is a forecast type in planning.

How a Demand Forecast Works

A demand forecast is deliberately simple: a product, a quantity, and the future time bucket it applies to. A planner records what they expect to sell or consume, and that record becomes a demand signal the projection can use before any customer order exists.

When the inventory projection runs, it rolls the projected available balance forward bucket by bucket, subtracting demand and adding supply. Forecasts join firm orders as demand in that roll-forward, so the projected balance reflects both what is committed and what is expected. This is what lets a make-to-stock item trigger a replenishment suggestion in time to actually build, rather than only reacting once real orders have already arrived and stock is short.

The subtle part is making sure the same demand is not counted twice. As real orders land in a bucket, a forecast consumption rule governs how they interact with the forecast for that bucket, either drawing the forecast down by the firm quantity or taking whichever is larger. Without that rule, a plant that forecast 400 and then took 400 real orders would prepare for 800.

A Concrete Example

A bakery expects to sell 400 units of Widget A in July, but in early June not a single July order has been placed. If the plan only looked at firm orders, July would appear empty and no build would be suggested until orders started arriving, by which point the lead time to react would be gone.

The planner instead enters a demand forecast of 400 for Widget A in the July bucket. Now the inventory projection carries that 400 forward as anticipated demand. If projected stock would drop below the target once July's forecast is subtracted, the projection surfaces a replenishment suggestion the planner can firm into a build-to-stock order well ahead of time.

Through June, real July orders trickle in. Under a subtract-consumed rule, each firm order draws down the July forecast, so 250 units of firm orders leave a residual forecast of 150. The plant ends up preparing for a genuine 400 units of July demand, not for 400 forecast plus 250 orders on top.

How EDGEBIC Uses It

A demand forecast is maintained as a record and consumed by the projection, and a few product behaviors flow from it.

• The inventory projection reads forecasts as anticipated demand and rolls them into the projected available balance alongside firm orders and scheduled receipts.
• The forecast consumption rule reconciles forecasts against firm demand per bucket, so arriving orders draw down the forecast rather than double-counting it.
• Replenishment suggestions can be driven by forecasted demand, giving a make-to-stock item enough runway to build ahead rather than reacting late.

A forecast is one of several demand triggers a build can carry, which is why a manufacturing order records its demand source. To see how arriving orders and forecasts reconcile inside a single bucket, read what is forecast consumption.