What is MRP in Manufacturing and 5 Reasons Why it is Important

Material resource planning — more commonly known as MRP — is a system manufacturers use to manage their materials and production effectively.

In this article, we look at five reasons why adopting an MRP system matters for your small manufacturing business.

What is MRP in manufacturing?

Let’s start with the basics: Material resource planning (sometimes also called Material requirements planning), or MRP for short, is the system manufacturers use to manage their production effectively.

It covers several key areas of a manufacturing business at once:

Master Production Schedule: describes when each product should be manufactured

Bill of materials (BOM): a list of the parts required to make each product

Production cycle: details each stage of production, including when different materials are required

Supplier Lead Times: the estimated time for purchased materials to arrive after a purchase order is placed

Customer Focus: MRP keeps a strong customer focus — every decision aims to make sure customers receive quality products within the timeframes they expect

Factual Approach: MRP uses metrics and data to guide decision-making, giving everyone on the team access to the same numbers

A (short) history of MRP software systems

MRP systems originated in the 1970s as a way to manage inventory and production more effectively. The first generation were manual, paper-based systems built around weekly production plans.

The shift to computerised systems in the 1980s changed things significantly — manufacturers could suddenly see real-time stock level updates. Today, manufacturers use sophisticated cloud-based MRP solutions to track inventory and manufacturing activity across countries and devices at once.

There’s often confusion between MRP and ERP systems. Both help manufacturers run their business, but they serve different purposes. MRP systems focus on managing materials and the production process, while ERP systems cover a wider range of enterprise functions — finance, HR, and customer relationship management included.

So, back to MRP. At its core, the goal is simple: make sure the right materials are available when you need them, so production never sits idle waiting on a restock.

To do this, MRP systems track three key pieces of information:

• what materials are required to produce a product

• when those materials will be needed

• how much of each material is required

That tracking starts with solid inventory management capabilities: knowing exactly how many raw materials and finished products you have on hand at any moment. The system also needs to follow that stock through your entire manufacturing process.

The master production schedule (MPS) sits at the heart of any production and inventory management system. It details which products need to be produced and when — and that information feeds into your bill of materials (BOM).

From there, the MPS drives everything else: the purchase orders for raw materials and components, and the manufacturing orders (MO) that go to the shop floor production team.

Why should small manufacturers use an MRP system?

Spreadsheets feel manageable at first. But once you’re trying to scale, they stop keeping up. You’ll find yourself manually reconciling stock counts, missing reorders, or losing track of where an order sits in the production process.

The right MRP system gives you and your team a clear picture of stock levels and what it takes to get products out the door — without the spreadsheet chaos.

Here are five reasons your small manufacturing business should be using one:

1. MRP systems help small manufacturers save time and money by reducing surplus inventory.

When you know exactly which raw materials and components a product needs — and when you’ll need them — you can order the right amount. Not a rough estimate. The right amount.

That directly improves your cashflow. Buying only what you need frees up cash you can redirect toward growing other parts of the business.

It also cuts down on storage costs. If you pay for warehouse space by the square foot, tying that space up with materials you may not touch for months is money you don’t need to spend.

2. MRP systems help manufacturers avoid production delays.

When the right materials are on hand when production needs them, delays caused by waiting on deliveries disappear. Your team knows what’s coming and when.

A predictable master production schedule lets your team plan their time — which translates directly into labour savings. For a small business, that matters.

If you sell DTC, production delays don’t just cost you money. They cost you reviews. Getting orders out when promised protects your reputation — and when a single one-star review can reach hundreds of potential customers, that’s not something to leave to chance.

3. MRP systems help businesses keep track of production progress.

By tracking what materials are needed and when, MRP systems give everyone on the team visibility into where each order stands — from the first purchase of raw materials all the way to finished products heading out the warehouse door.

Full visibility into your inventory management situation means you can catch and address manufacturing issues before they compound, and improve delivery times as a result.

You can also use your MRP data to spot direct cost savings — which vendor offers the best material prices, where production can move faster without cutting corners on quality.

4. MRP systems improve communication between your team

Because MRP systems track what materials are required and when, different teams can coordinate without constant back-and-forth.

For example, if your support team knows a customer has ordered something that’s not currently in stock, they can check the MRP, see where things are in the production schedule, and give the customer an accurate lead time — rather than chasing the warehouse team for an update.

5. MRP systems help businesses better manage their supply chain

By tracking what materials are needed and when, businesses can use MRP software to keep their supply chain running smoothly and make sure deliveries arrive when production actually needs them.

For businesses running Just-In-Time (JIT) inventory systems — where you order and receive materials only as production demands them — this level of supply chain visibility is what makes the whole model work. Without it, you’re relying on gut feel, which JIT doesn’t forgive.

Managing your supply chain through MRP reduces production disruptions and means customers get what they ordered, when they expected it.

If you plan to grow your manufacturing operation, pick an MRP system that can scale with you. Rebuilding your entire process because your software hit its ceiling is an expensive problem to solve after the fact.

MRP is a practical tool that helps small manufacturers run tighter operations, reduce waste, and stay on top of their numbers. When it’s working well, you spend less time fire-fighting and more time building the business.