MRP (Material Requirements Planning) is a system that calculates exactly what materials a manufacturer needs, how much of each, and when they need to be available — based on customer demand, sales orders, bills of materials (BOMs), and current inventory. Originally developed in the 1960s, MRP is the foundation that most modern manufacturing software (including ERP and SRP) is built on.
Material Requirements Planning (MRP) is the calculation that turns demand into a purchasing and production plan. It takes three inputs — what customers have ordered, the bill of materials for each product, and the current inventory of every component — and produces an output: a time-phased list of what to buy, what to make, and when each is needed.
MRP is the planning engine inside every modern manufacturing system, including ERP, MRP II, and Smart Resource Planning (SRP) platforms.
An MRP run executes a sequence of calculations that net out demand against current and incoming supply.
The terminology around manufacturing planning has evolved over decades. The short version of each:
For small and mid-size manufacturers, classic MRP-only software is often too narrow — it tells you what to buy but doesn't help with work orders, scheduling, quality, or traceability. And classic ERP is often too heavy — full of finance and HR modules that startups don't need yet.
Modern Smart Resource Planning platforms like Esvos include MRP-equivalent calculations as one connected piece of a broader operational system — alongside work orders, inventory, scheduling, quality, and AI agents — without the cost and complexity of legacy ERP.
MRP stands for Material Requirements Planning. Historically, the term has also been used as shorthand for MRP II (Manufacturing Resource Planning), which extends the original concept to include capacity and scheduling.
MRP is a focused planning calculation that tells you what materials to buy and when. ERP is a broader enterprise system that includes MRP as one of many modules — alongside finance, HR, sales, CRM, and more. For a manufacturing-first company, ERP often includes far more than you need; MRP-only software often includes too little.
MRP (Material Requirements Planning) calculates material needs from demand and BOMs. MRP II (Manufacturing Resource Planning) is a superset that adds capacity planning, scheduling, and shop-floor control. Most modern manufacturing software is MRP II — even if it's still informally called "MRP."
If you have more than a handful of products with BOMs, multiple suppliers, and variable customer demand, yes — running MRP calculations in spreadsheets becomes unreliable quickly. Modern Smart Resource Planning platforms like Esvos include MRP capability as part of a broader connected system, sized and priced for small and mid-size manufacturers.
No. Inventory management tracks what you currently have on hand and where it is. MRP uses that inventory data — plus demand and BOMs — to calculate what you need to buy or make and when. The two work together: inventory management feeds MRP, and MRP outputs become purchase orders and work orders that change inventory.
Smart Resource Planning (SRP) platforms like Esvos include MRP calculations as one connected piece of a broader operational system — alongside work orders, inventory, scheduling, quality, traceability, and AI agents. For most small and mid-size manufacturers, an SRP platform is more useful than a standalone MRP tool because it eliminates the integration work of stitching MRP to inventory, work orders, and purchasing.
Esvos brings Material Requirements Planning together with inventory, work orders, scheduling, quality, and AI agents — in one system, built for manufacturing startups and SMBs.