A production schedule can look perfect on paper.
The customer order is confirmed. Engineering has approved the specifications. Labor is available. Equipment is ready.
Then production discovers that a critical component hasn’t arrived.
Suddenly, a job that was supposed to start today is delayed. Purchasing scrambles to contact suppliers, planners rearrange schedules, and customer service faces difficult questions about delivery commitments.
For manufacturers, material shortages are more than an inventory problem.
They affect productivity, production capacity, costs, and customer satisfaction.
That’s why manufacturing material requirements planning (MRP) is essential to maintaining efficient operations.
As manufacturers prepare for 2027, connecting material planning with customer demand, inventory, purchasing, and production schedules can help prevent disruptions while reducing unnecessary inventory investment.
For complex make-to-order manufacturers, integrated MRP software provides the visibility needed to ensure materials are available when and where production needs them.
What Is Material Requirements Planning (MRP) in Manufacturing?
Material Requirements Planning, commonly known as MRP, is a manufacturing planning process that determines which materials and components are required, how much is needed, and when those materials must be available.
MRP typically evaluates information such as:
- Customer orders and demand forecasts
- Master production schedules
- Bills of materials (BOMs)
- Current inventory
- Allocated materials
- Open purchase orders
- Supplier lead times
- Production requirements
- Planned order quantities
Using this information, MRP calculates material requirements and recommends purchasing or production actions.
The objective is straightforward:
Have the right materials available at the right time without carrying unnecessary inventory.
For manufacturers producing customized products, this becomes particularly important because material requirements may change with every customer order.
Why Material Planning Is Becoming More Important
Manufacturers face a difficult balancing act.
Too little inventory can stop production.
Too much inventory ties up working capital, consumes storage space, and increases carrying costs.
At the same time, manufacturers must account for changing customer requirements, supplier performance, product complexity, and production schedules.
Traditional planning approaches based on spreadsheets, manual reorder calculations, and disconnected purchasing systems can struggle to keep pace.
Integrated MRP provides a more structured approach by connecting demand with available supply.
Here are seven ways manufacturers can improve material planning and reduce production disruptions.
1. Connect Material Requirements Directly to Customer Orders
For make-to-order manufacturers, material planning often begins with the customer order.
A window manufacturer may receive an order with specific dimensions, glass options, frame materials, and hardware.
A cabinet manufacturer may need different wood species, finishes, hinges, and accessories for each project.
A metal building manufacturer may require unique profiles, components, and fabrication materials.
These selections directly affect what purchasing and production need.
When customer orders and material planning are disconnected, employees may need to calculate requirements manually.
Integrated ERP connects order information with product configuration and bills of materials.
This allows material requirements to be calculated using the specifications associated with the order.
The result is a more reliable connection between what customers order and what manufacturing needs to build.
2. Improve Inventory Accuracy Before Planning Purchases
MRP is only as reliable as the information supporting it.
If inventory records are inaccurate, purchasing recommendations may also be inaccurate.
For example, a system may indicate that 500 components are available when only 350 are physically in stock.
The manufacturer may then discover a shortage after production has already been scheduled.
Improving inventory accuracy requires consistent processes for:
- Receiving materials
- Recording inventory movements
- Allocating components
- Tracking material consumption
- Processing returns
- Performing cycle counts
- Managing inventory adjustments
Integrated ERP helps connect inventory transactions with purchasing and production activities.
Accurate inventory information gives planners greater confidence when evaluating future requirements.
3. Account for Supplier Lead Times
Knowing what to purchase is only part of material planning.
Manufacturers also need to know when to purchase it.
Consider a component with a four-week supplier lead time.
If production needs that component in two weeks, placing the purchase order today may already be too late.
MRP helps manufacturers account for lead times when calculating planned purchase requirements.
These calculations can consider:
- Required production dates
- Supplier lead times
- Existing purchase orders
- Inventory availability
- Planned manufacturing activity
This helps purchasing teams identify requirements earlier and reduce last-minute expediting.
Manufacturers should also review actual supplier performance regularly.
A lead time recorded in the ERP system may no longer reflect current delivery conditions.
Maintaining accurate supplier information is essential to effective planning.
4. Reduce Excess Inventory Without Increasing Shortage Risk
Manufacturers sometimes respond to material shortages by purchasing more inventory.
While additional safety stock can be appropriate for certain materials, carrying excessive inventory creates its own problems.
These include:
- Higher working capital requirements
- Increased storage costs
- Obsolete materials
- Inventory handling expenses
- Greater risk of damage
- Reduced cash flow flexibility
Effective MRP helps manufacturers distinguish between materials needed for actual demand and inventory being purchased unnecessarily.
Different materials may require different planning approaches.
For example:
High-volume standard components may benefit from reorder-point planning.
Customer-specific materials may be better suited to demand-driven purchasing.
Frequently consumed production supplies may benefit from Kanban-based replenishment.
An integrated ERP system can support different material planning methods according to product and operational requirements.
5. Connect MRP With Production Scheduling
Material planning and production scheduling should not operate independently.
A production planner may have sufficient equipment and labor capacity to start a job.
But if required materials are unavailable, that capacity cannot be used effectively.
Likewise, purchasing may order materials based on an outdated schedule, resulting in inventory arriving earlier than necessary.
Connecting MRP with production scheduling helps align material requirements with manufacturing priorities.
This can improve coordination around:
- Planned production start dates
- Material availability
- Work center requirements
- Customer delivery commitments
- Schedule changes
- Purchasing priorities
For make-to-order manufacturers, this connection becomes increasingly important as product configurations and customer priorities change.
The objective isn’t simply ensuring materials are available.
It’s ensuring materials arrive when they can be used productively.
6. Respond Faster When Manufacturing Requirements Change
Manufacturing plans rarely remain unchanged.
A customer modifies an order.
Engineering revises a specification.
A supplier delays a shipment.
Production moves a job forward.
An urgent customer request changes priorities.
Each event can affect material requirements.
Without connected systems, employees may need to manually review inventory, purchase orders, and production schedules to determine the impact.
Integrated MRP helps planners evaluate updated requirements and identify recommended actions.
Depending on the planning configuration, these actions may include:
- Creating additional purchase orders
- Rescheduling existing orders
- Adjusting production requirements
- Transferring inventory between locations
- Reviewing material shortages
- Revising planned quantities
This creates a more responsive planning process.
7. Improve Purchasing Decisions With Better Visibility
Purchasing teams need more than a list of materials to order.
They need to understand the demand behind those requirements.
For example:
Is the material required for a confirmed customer order?
Is it needed for planned production?
Is inventory already available at another location?
Is an existing purchase order expected to arrive in time?
Could a schedule change eliminate the immediate requirement?
Integrated MRP provides greater visibility into supply and demand relationships.
That helps purchasing teams prioritize requirements and avoid unnecessary transactions.
It also supports more informed conversations with suppliers when delivery schedules change.
MRP vs. ERP: What’s the Difference?
Manufacturers researching material planning software often encounter both MRP and ERP.
Although closely related, they serve different purposes.
| Capability | MRP | ERP |
|---|---|---|
| Calculate material requirements | Yes | Through integrated MRP |
| Evaluate bills of materials | Yes | Yes |
| Plan purchasing requirements | Yes | Yes |
| Coordinate production planning | Yes | Yes |
| Manage customer orders | Limited or through integration | Yes |
| Manage financial accounting | Generally no | Yes |
| Support product configuration | Not typically a core function | Available in manufacturing-focused ERP |
| Connect enterprise operations | Limited scope | Yes |
MRP focuses primarily on material and production requirements.
ERP connects those planning activities with broader business processes such as customer management, purchasing, inventory, manufacturing, shipping, and financial management.
For complex manufacturers, integrated ERP helps ensure material planning is informed by the same information used throughout the organization.
A Practical Manufacturing MRP Example
Consider a hypothetical door manufacturer that receives an order for 200 custom doors.
Each door requires:
- One door panel
- Three hinges
- One hardware set
- One packaging kit
The order therefore requires:
| Component | Quantity per door | Total requirement |
|---|---|---|
| Door panel | 1 | 200 |
| Hinges | 3 | 600 |
| Hardware set | 1 | 200 |
| Packaging kit | 1 | 200 |
Now assume the manufacturer already has:
- 75 door panels
- 450 hinges
- 80 hardware sets
- 250 packaging kits
Ignoring existing allocations, incoming purchase orders, safety stock, and lot-sizing rules for this simplified example, the additional requirements would be:
| Component | Total required | Available | Additional needed |
|---|---|---|---|
| Door panels | 200 | 75 | 125 |
| Hinges | 600 | 450 | 150 |
| Hardware sets | 200 | 80 | 120 |
| Packaging kits | 200 | 250 | 0 |
MRP helps translate these calculations into planned supply requirements.
It also considers when materials must be available based on the production schedule and applicable lead times.
In actual manufacturing environments, these calculations can become significantly more complex because of multi-level bills of materials, allocations, purchase orders, manufacturing lead times, and changing customer requirements.
That’s where automated material planning becomes especially valuable.
MRP KPIs Every Manufacturer Should Monitor
Manufacturers should evaluate material planning performance using operational metrics.
| KPI | What it measures |
|---|---|
| Material availability rate | Percentage of production requirements with materials available when needed |
| Inventory accuracy | Agreement between recorded and physical inventory |
| Inventory turnover | How efficiently inventory is consumed and replenished |
| Supplier on-time delivery | Percentage of supplier deliveries received by the required date |
| Stockout frequency | How often required materials are unavailable |
| Purchase order expedite rate | Frequency of urgent purchasing actions |
| Inventory carrying cost | Cost of holding inventory |
| Schedule adherence | How consistently production follows planned schedules |
Monitoring these indicators helps manufacturers identify whether material planning improvements are reducing disruptions and supporting better inventory performance.
Why MRP Is Especially Important for Make-to-Order Manufacturers
Standardized manufacturing environments often use predictable materials and production quantities.
Make-to-order manufacturers face different challenges.
Every order may introduce new:
- Product dimensions
- Components
- Materials
- Hardware requirements
- Engineering specifications
- Production routings
- Delivery requirements
A manufacturer may have enough inventory for one product configuration but insufficient materials for another.
This makes accurate product configuration and bills of materials particularly important.
When configuration, engineering, material planning, and production operate from connected information, manufacturers can better manage these variations.
How Frontier ERP Supports Manufacturing Material Requirements Planning
Frontier ERP provides integrated material planning capabilities designed to support different manufacturing and distribution requirements.
Its documented planning applications include:
- Master Production Scheduling (MPS)
- Material Requirements Planning (MRP)
- Distribution Requirements Planning (DRP)
- Reorder Point (ROP) planning
- Kanban-based material planning
Frontier allows planning methodologies to be defined at the product and plant or warehouse level, giving manufacturers flexibility across product lines and operational environments.
Its MRP and DRP capabilities support:
- Net-change and regenerative planning
- Selected-product planning
- Single-location and multi-location planning
- User-defined planning horizons
- Supply and demand visibility
- Suggested purchasing, production, and transfer orders
- Integration with capacity planning
These capabilities help manufacturers coordinate material requirements with production activity and purchasing decisions.
For make-to-order manufacturers, this integration is particularly valuable because material requirements are closely connected to product configuration and customer demand.
How MRP Fits Into the Frontier 5.0 Vision
Manufacturing technology continues to evolve.
Automation is becoming more connected.
Operational data is becoming more important.
Customer expectations continue to increase.
But manufacturers still depend on a fundamental requirement:
Production cannot move efficiently without the right materials.
The direction behind Frontier 5.0 emphasizes connecting critical business processes through a more unified manufacturing environment.
One Platform. Smarter Manufacturing. Stronger Business.
Material planning is an important part of that foundation.
When customer orders, configuration, inventory, purchasing, scheduling, and production share reliable information, manufacturers can reduce unnecessary manual work and improve operational coordination.
Preparing for 2027: Is Your Material Planning Process Ready?
As manufacturers prepare their 2027 operating plans, material planning deserves attention.
Consider asking:
- How frequently does production stop because materials are unavailable?
- Are purchasing decisions based on current demand?
- How accurate are inventory records?
- Are supplier lead times regularly reviewed?
- How much inventory is being held unnecessarily?
- Can planners see material shortages before jobs are released?
- How quickly can purchasing respond to engineering or schedule changes?
- Are material requirements calculated automatically or maintained in spreadsheets?
These questions can reveal opportunities to improve production readiness and inventory efficiency.
Manufacturers don’t necessarily need more inventory.
They need better visibility into the inventory they have and the materials they will need.
Conclusion: Better Material Planning Creates More Reliable Manufacturing
A production schedule is only as reliable as the materials supporting it.
When manufacturers cannot accurately plan material requirements, the consequences extend across the business.
Production slows.
Purchasing becomes reactive.
Inventory costs increase.
Customer commitments become harder to maintain.
Integrated material requirements planning helps manufacturers connect demand, inventory, purchasing, and production through a more coordinated process.
For make-to-order manufacturers, that connection is essential to managing product complexity while maintaining efficiency.
As businesses prepare for 2027, improving MRP can provide a practical foundation for reducing shortages, controlling inventory investment, and supporting more reliable production.
Because smarter manufacturing starts with having the right materials at the right time.
Frequently Asked Questions
What is material requirements planning in manufacturing?
Material requirements planning (MRP) is a process used to calculate which materials are needed, how much is required, and when they must be available to support production.
How does MRP help prevent manufacturing shortages?
MRP evaluates production demand, bills of materials, inventory, purchase orders, and lead times to identify future material requirements and recommend purchasing or production actions.
What is the difference between MRP and ERP?
MRP focuses on material and production requirements, while ERP connects those activities with customer orders, inventory, purchasing, manufacturing, shipping, and financial management.
Why is MRP important for make-to-order manufacturing?
Make-to-order products often require unique components and materials. MRP helps calculate requirements based on the specific configuration and production needs of each order.
Can MRP reduce excess inventory?
Yes. Effective MRP can help align material purchases with actual production demand, reducing unnecessary inventory while maintaining sufficient material availability.
What is the difference between MRP and reorder point planning?
MRP calculates time-phased requirements based on demand and production needs. Reorder point planning triggers replenishment when inventory reaches a defined threshold.
How does Frontier ERP support material planning?
Frontier ERP supports MPS, MRP, DRP, reorder point, and Kanban-based planning, with integrated inventory, purchasing, production, and capacity planning capabilities.
