An ERP (enterprise resource planning system) is software that centralises the management of a business's different areas (inventory, purchasing, sales, accounting, HR) in one place. Instead of each area having its own disconnected tool, an ERP joins them into a single system with shared, consistent data.
The clearest sign you already need one
When the business's important information lives spread across several different spreadsheets, each managed by a different person, and nobody has a complete, up-to-date picture of how the business is doing in real time, that's a fairly clear sign it's time for an ERP.
What an ERP solves that spreadsheets can't
Real-time updates (when something sells, stock updates automatically everywhere it matters), traceability (knowing exactly what happened, when and who did it), and eliminating errors from transcribing the same data multiple times in different places.
The myth that ERP is a "big company thing"
ERP solutions exist specifically designed for small businesses, with far lower cost and implementation complexity than traditional enterprise systems (SAP, Oracle), built for businesses with dozens of employees, not thousands.
The biggest risk when implementing an ERP
Underestimating the time and effort of migrating existing data, and not devoting enough training to get the team to actually adopt it. A poorly implemented ERP, with an untrained team, ends up abandoned in favour of the old spreadsheets within a few months.
Frequently asked questions
At what company size does an ERP start to make sense?
There's no exact employee count; it depends more on process complexity and how many different areas need coordinating. Some 5-person businesses already need one; some 30-person ones still don't.
How long does it take to implement an ERP?
For a small business, anywhere from a few weeks to a few months, depending on how many processes and how much historical data need migrating.
Does an ERP replace a CRM?
Not necessarily; many businesses use both together: the CRM focused on sales and customer relationships, the ERP focused on internal operations (inventory, purchasing, accounting).