What is MRP in Manufacturing? A Guide for Small Makers
Material Requirements Planning (MRP) helps small manufacturers know exactly what materials to order, when to order them, and how much to produce. Here's how it works — and why it matters more than most makers realise.
Material Requirements Planning — or MRP — is the system manufacturers use to ensure they have the right materials, in the right quantities, at the right time for production.
In this guide, we cover what MRP means, how it works in practice, and five reasons why using one (even as a small maker) will make your business easier to run.
Need to get your raw material and product inventory in control?
Try Craftybase - the inventory and manufacturing solution for DTC sellers. Track raw materials and product stock levels (in real time!), COGS, shop floor assignment and much more.
It's your new production central.
What is MRP in manufacturing?
MRP (Material Requirements Planning) is a production planning system that tells you what materials you need, when you need them, and how much to order — based on your actual production schedule and what’s already in stock.
It connects three core pieces of your manufacturing operation:
- What you plan to make — your master production schedule (MPS)
- What it takes to make it — your bill of materials (BOM)
- What you already have — your current raw material and component inventory
By linking these three things together, MRP systems eliminate the guesswork from production planning. Instead of eyeballing your shelves and hoping you’ve ordered enough, you get exact purchase quantities and timing based on real data.
What does MRP stand for?
MRP stands for Material Requirements Planning — though you’ll also see it used as shorthand for Material Resource Planning or Manufacturing Resource Planning, which are closely related concepts. All three terms describe systems that help manufacturers manage the materials and processes needed to produce finished goods.
There’s often confusion between MRP and ERP systems. Both help manufacturers run their business, but ERP (Enterprise Resource Planning) is a broader category that covers finance, HR, and supply chain alongside manufacturing. MRP is specifically focused on materials and production — which is exactly what most small makers actually need.
A (short) history of MRP software
MRP systems originated in the 1970s as a way to manage inventory and production schedules. Early systems were manual and paper-based. The shift to computerised systems in the 1980s changed things significantly — manufacturers could see real-time stock level updates for the first time.
Today, cloud-based MRP solutions have replaced legacy on-premise software for most small manufacturers. Modern cloud MRP tools sync across devices, integrate directly with e-commerce platforms like Shopify and Etsy, and some now use AI-assisted demand forecasting to flag potential stockouts before they happen.
How does MRP work? The four building blocks
A complete MRP system connects four key components. Understanding each one helps clarify what you’re actually tracking — and why it matters.
1. Master Production Schedule (MPS)
The master production schedule sits at the heart of any MRP system. It describes what you plan to produce and when — essentially a forward-looking production calendar that tells the rest of the system what to prepare for.
The MPS feeds into your bill of materials to calculate what materials and components are required, and when purchase orders need to go out to meet those production dates.
2. Bill of Materials (BOM) integration
Your bill of materials is the recipe for each product — a complete list of the raw materials, components, and sub-assemblies required to make one finished unit.
MRP uses the BOM as a multiplier: if the MPS says you need to produce 50 units of a product next week, the system multiplies the BOM quantities by 50 to calculate exactly how much of each material to prepare. This is where MRP systems save makers the most time — no more manually calculating “how much beeswax do I need if I’m making 80 lip balms?”
3. Supplier lead times
Lead time is the gap between when you place a purchase order and when the materials actually arrive. MRP systems account for this by working backwards from your production date — if you need materials by Tuesday and your supplier takes 5 days to deliver, the system flags that you need to order by Thursday.
Getting lead times right is a surprisingly common setup mistake in MRP. Under-estimating them is how production delays happen.
4. Just-in-Time (JIT) and inventory levels
Many small manufacturers run a Just-in-Time (JIT) approach — ordering materials as close to when they’re needed as possible to keep cash tied up in stock to a minimum. MRP supports JIT by providing precise timing data: instead of ordering a 3-month buffer of supplies, you can order confidently for a 2-week production run.
The flip side is that JIT leaves less margin for supplier delays. MRP helps you manage that risk by giving you visibility into lead times and current stock levels before you commit to a production schedule.
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.
MRP vs. spreadsheets: a side-by-side comparison
| Spreadsheet | MRP system | |
|---|---|---|
| Material tracking | Manual counts, prone to entry errors | Real-time, updated automatically as stock moves |
| BOM / recipe costing | Calculated by hand, per product | Auto-calculated from your recipes every time |
| Reorder alerts | None unless you build your own formulas | Built-in low-stock triggers |
| Multi-channel orders | Copy-paste from each platform | Synced automatically from Etsy, Shopify, etc. |
| Production planning | Separate tab or file, easy to get out of sync | Integrated with inventory and BOM data |
| COGS reporting | Manual calculation at tax time | Generated automatically from production records |
| Scales with your business | Gets unwieldy as SKUs and channels multiply | Designed to grow with you |
The short version: spreadsheets put you in charge of keeping everything consistent. MRP systems keep it consistent for you.
Here are five reasons your small manufacturing business should be using one:
1. Reduce surplus inventory and free up cashflow
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 workshop space, tying it up with materials you may not touch for months is money you don’t need to spend.
2. 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 a single one-star review can reach hundreds of potential customers.
3. Keep track of production progress end-to-end
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 door.
Full visibility into your manufacturing inventory situation means you can catch and address problems before they compound, and use the data to spot direct cost savings — which vendor offers the best prices, where production can move faster without cutting corners on quality.
4. Improve communication across your team
Because MRP systems track what materials are required and when, different roles can coordinate without constant back-and-forth. Your support team can check the production schedule and give customers an accurate lead time, rather than chasing the warehouse team for an update. Your purchasing team knows exactly when to reorder without waiting on a manual count.
For a solo maker, this mostly means fewer mental tabs to keep open. For a small team, it’s the difference between reactive chaos and a smooth operation.
5. Manage your supply chain proactively
By tracking what materials are needed and when, MRP software keeps your supply chain running smoothly and makes sure deliveries arrive when production actually needs them.
For JIT operations especially, this level of supply chain visibility is what makes the whole model work. Without it, you’re relying on gut feel — and JIT doesn’t forgive that.
If you plan to grow, 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 in 2026: cloud tools and AI-assisted planning
The MRP software landscape looks quite different today than it did even five years ago. A few shifts worth knowing about:
Cloud MRP is now the default. On-premise MRP installations — which once required IT infrastructure and significant upfront cost — have largely been replaced by cloud-based tools that run in a browser, sync in real time, and connect directly to your Shopify or Etsy shop.
AI-assisted demand forecasting is emerging. Some MRP tools now use machine learning to analyse your sales history and flag likely demand spikes before they hit. For makers with seasonal products (candles in November, gifts in December), this kind of forward-looking signal is genuinely useful.
Maker-specific MRP tools exist. Most enterprise MRP systems were built for large factories. But tools like Craftybase are designed specifically for small-batch in-house manufacturers — integrating recipe costing, multi-channel order import, and inventory tracking in one platform at a fraction of the cost of enterprise software.
Frequently Asked Questions
What does MRP stand for in manufacturing?
MRP stands for Material Requirements Planning — a system that calculates what materials you need, how much to order, and when to order them based on your production schedule. You'll also see MRP used as shorthand for Material Resource Planning and Manufacturing Resource Planning, which are closely related concepts covering the same core workflow: connecting your production plan to your material inventory.
What is an MRP system?
An MRP system is software that automates production and materials planning by linking your production schedule, bill of materials, and current inventory levels. It tells you exactly what to order and when, so you never run short of materials mid-production or over-order and tie up cash in stock you don't need yet. Modern cloud-based MRP systems for small manufacturers, like Craftybase, also integrate with Etsy, Shopify, and other sales channels to pull in orders automatically.
What's the difference between MRP and ERP?
MRP focuses on materials and production — tracking raw materials, managing your bill of materials, and planning purchase orders. ERP (Enterprise Resource Planning) is a broader system that covers the whole business: finance, HR, supply chain, and manufacturing in one platform. ERP systems are generally more expensive and complex to implement. For most small makers, a dedicated MRP system is the better starting point — you get exactly the production and inventory features you need without paying for HR modules you'll never use.
Can small businesses use MRP software?
Yes — and the earlier you start, the less painful it is. MRP used to mean expensive enterprise software built for large factories. Today, cloud-based MRP tools are built specifically for small manufacturers and solo makers, with pricing and workflows that match a small operation rather than a 500-person plant. If you're making products to sell — even as a one-person studio — the core MRP workflow of connecting your recipes, materials, and production schedule will save you real time and money.
Does Craftybase work as an MRP system for makers?
Yes. Craftybase is an MRP system built specifically for small-batch makers — covering the core MRP workflow of recipe/BOM management, raw material inventory tracking, production planning, and COGS calculation. It also connects directly to Etsy, Shopify, Amazon, and other sales channels so orders flow in automatically. The main difference from enterprise MRP is that Craftybase is designed for makers who produce products in-house, not factories running assembly lines — so the interface and pricing are both scaled for a small operation.
The right MRP for small makers
MRP is a practical tool that helps 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.
For small-batch makers, the best starting point is a system designed for your scale — not a scaled-down version of enterprise software, but something built from the ground up for in-house production. Craftybase handles the full MRP workflow — recipe costing, raw material tracking, production runs, COGS calculation, and multi-channel order import — at a price point that makes sense for a small studio.
