MRP
Planning & Scheduling
Material Requirements Planning (MRP) is a production planning and inventory control system that calculates material requirements based on production schedules. It determines what materials are needed, how much is needed, and when they are needed based on bills of materials and current inventory levels.
ARTICLE METADATA
Term: MRP
Field / Domain: Manufacturing / Planning & Scheduling
Last Reviewed: August 2026
1. TERM HEADER
MRP (Material Requirements Planning)
Abbreviation: MRP
Domain Tags: [Manufacturing] [Planning] [Inventory]
2. CONCISE DEFINITION
Material Requirements Planning (MRP) is a planning method that calculates what materials to buy or make, in what quantity, and by when — by exploding a product's bill of materials against the production schedule and current inventory.
3. EXPANDED DEFINITION
MRP takes demand (orders and forecasts), breaks each product down through its bill of materials, subtracts what is already on hand or on order, and produces time-phased purchase and production plans. It answers three questions: what, how much, and when. Modern MRP is the planning backbone of most manufacturing ERPs.
4. HISTORICAL TIMELINE
1960s — MRP emerges as computers make bill-of-materials explosion practical.
1980s — MRP II adds capacity and financial planning.
1990s — MRP becomes a core module of ERP systems.
2020s — Real-time shop-floor data lets MRP plans be corrected against actual flow instead of stale assumptions.
5. HOW MONITORZ MAKES MRP ACTIONABLE
A plan is only as good as the data behind it. MonitorZ feeds MRP with live reality: [Real-time production tracking](/shop-floor-data-collection) keeps on-hand and in-process numbers accurate, [Capacity Planning](/manufacturing-capacity-planning-software) checks that plans are achievable, and [Production Scheduling](/production-scheduling-software) sequences the work. [Inventory Management](/inventory-management-software) keeps materials aligned so the constraint is never starved. Deployments have raised production up to **133% within 120 days** across **500+ implementations**. See the [Solutions overview](/solutions).
6. COMMON MISCONCEPTIONS AND CLARIFICATIONS
Misconception: MRP guarantees materials arrive on time. Clarification: MRP only plans; execution depends on accurate, current inventory and production data, which is where most MRP systems fail.
7. FREQUENTLY ASKED QUESTIONS (FAQ)
Q: What is MRP in manufacturing?
A: MRP, or Material Requirements Planning, calculates what materials to buy or make, how much, and when, by exploding the bill of materials against the schedule and current inventory.
Q: What is the difference between MRP and ERP?
A: MRP is a planning method focused on materials and production. ERP is a broader system that includes MRP along with finance, sales, and other business functions.
Q: How does MonitorZ improve MRP?
A: MonitorZ feeds MRP with real-time inventory and shop-floor data, so plans reflect what is actually happening rather than outdated numbers.
11. RELATED TERMS AND CONCEPTS
BOM, Capacity Planning, Production Scheduling, Inventory Management, Lead Time.