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CMMS vs EAMWhat the difference actually is
A CMMS manages maintenance execution; an EAM manages the whole life of an asset, from the decision to buy it through to its disposal. Maintenance is one phase inside the second.
In practice the categories overlap heavily — nearly every EAM contains CMMS functionality, and several CMMS products have grown upward into EAM territory. This page sets out where the line genuinely falls, what each one costs, and how to tell which side of it you are on.
The two categories, defined
CMMS
A Computerized Maintenance Management System is the system of record for maintenance work. It holds the asset register, raises and tracks work orders, generates preventive maintenance on a schedule or meter reading, manages spare parts, and reports on backlog, completion and cost. Its question is: is the equipment being maintained, by whom, and at what cost?
EAM
An Enterprise Asset Management system takes the asset as a financial and strategic object across its entire life: capital planning, procurement, commissioning, operation, maintenance, depreciation, refurbishment and disposal. It typically adds contract and warranty management, multi-site consolidation, and integration with ERP finance. Its question is: what should we own, for how long, and what is it costing us in total?
ISO 55000, the international standard on asset management, describes this wider discipline — the coordinated activity by which an organisation realises value from its assets. EAM software is the tooling that discipline usually implies at scale. A CMMS supports it, but does not attempt to cover it.
Side by side
| Dimension | CMMS | EAM |
|---|---|---|
| Primary scope | Maintenance execution — work orders, schedules, spare parts, technician time | The full asset lifecycle, of which maintenance is one phase |
| Asset lifecycle coverage | From commissioning to decommissioning: service history, costs, failures | From capital planning and procurement through operation to disposal and replacement |
| Financial depth | Maintenance cost per asset, parts consumption, labour time | Depreciation, book value, capital budgeting, total cost of ownership |
| Typical organisation size | A single site to a few dozen; teams of 1–200 | Multi-site, often multi-country; asset bases in the tens of thousands |
| Procurement & contracts | Purchase orders and vendors, tied to maintenance | Full supply chain, service contracts, warranty and SLA management |
| Typical cost | $0 to roughly $50 per user per month, or a flat company fee | Five to seven figures a year, quoted per site or per contract |
| Implementation | Days to weeks, usually self-serve | Months to years, with an integration partner |
| Best-fit use case | Keeping equipment running and proving it was maintained | Deciding what to buy, keep, refurbish or retire across a portfolio |
Cost figures are indicative market ranges for comparison, not quotes. Both categories price on request above their entry tiers.
Where the line really falls
The category names are marketing terms as much as technical ones, and the boundary has moved: mid-market CMMS products now routinely include purchase orders, vendor management and multi-site support that would have been called EAM features fifteen years ago. Three questions separate the two more reliably than any feature list.
- Does finance need the asset's book value from this system? If depreciation, capital budgeting and total cost of ownership have to live in the same place as the maintenance history, that is an EAM requirement. A CMMS tracks what maintenance cost, not what the asset is worth.
- Are you deciding whether to keep the asset at all? Repair-or-replace analysis across a portfolio, refurbishment planning, end-of-life scheduling — these are lifecycle decisions. A CMMS gives you the failure and cost history that feeds them, but does not model the decision.
- How many sites need to be consolidated, and by whom? Several plants each running their own maintenance is a CMMS problem. A corporate function needing one comparable asset view across all of them, with standardised hierarchies and central reporting, is where EAM starts to earn its cost.
Note what is not on that list: number of assets. A single site with eight thousand assets is still a maintenance-execution problem. Volume alone does not make an EAM the right answer — the shape of the decisions you need to support does.
The honest answer: most teams need a CMMS
For the great majority of small and mid-sized organisations, an EAM solves problems they do not have, at a cost and an implementation length that are real. The failure mode is well documented and unglamorous: a long implementation, a system technicians find slower than the paper it replaced, and an asset register that stops being updated within a year. At that point the organisation owns an expensive database of increasingly wrong data.
The reverse mistake is real too, and worth stating plainly: if you are running a portfolio across many sites, answering to finance on asset value, and planning capital replacement cycles, a CMMS will not stretch to cover it, and bolting spreadsheets onto one to fake the difference is worse than buying the right tool.
A reasonable sequence for most teams is to start with maintenance execution, get the asset register and the work history accurate, and let the data tell you whether you ever need the lifecycle layer. An EAM built on a maintenance history nobody trusted is not an upgrade.
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