Key takeaways
- An MPS specifies which finished goods to build, in what quantity, and by what date — it is a plan for output, not for individual components.
- MRP uses the MPS as its demand input, exploding it down through the BOM to calculate what components to order or produce, and when.
- A simple, single-product business can often run on a rough production plan or a backlog of confirmed orders instead of a formal MPS; it earns its complexity once you are scheduling several products competing for the same capacity.
What a master production schedule is
A master production schedule (MPS) is a time-phased plan stating which finished goods (or major sub-assemblies) will be produced, in what quantities, and by what dates. It sits above the component level: the MPS deals in finished products, not the raw materials or parts that go into them.
The MPS is built from a mix of confirmed customer orders and a demand forecast, balanced against known production capacity, so the plan is realistic rather than just aspirational.
How the MPS feeds MRP
The MPS is the demand input that material requirements planning uses. MRP takes the MPS's finished-good quantities and dates, explodes each one down through its bill of materials to determine every component required, nets that against on-hand and on-order stock, and offsets by lead time to produce a purchasing and production plan.
Without an MPS, MRP has no demand signal to explode — a BOM alone says what a product is made of, not how many to build or by when.
- MPS: what finished goods to build, how much, and by when
- BOM: what components make up each finished good
- MRP: combines the MPS and BOM (plus on-hand stock and lead times) to plan what to order or produce
When a formal MPS is worth setting up
A business building one or two products against a simple order backlog can often plan production informally — a list of confirmed orders and rough capacity awareness does the same job. A formal MPS becomes valuable once several products compete for the same production capacity or shared components, where an informal plan risks over-committing capacity or missing a shared-component conflict that a written, time-phased schedule would have caught.
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