Mean Maintenance Cost
Mean Maintenance Cost is the average maintenance cost per defined maintenance event during a selected period.
What this term means in maintenance
Mean Maintenance Cost is the average maintenance cost per defined maintenance event during a selected period.
Mean Maintenance Cost formula
Mean Maintenance Cost = Total maintenance cost ÷ Number of maintenance events
Practical example
A plant records 120,000 in maintenance cost across 80 eligible repair events.
Mean Maintenance Cost = 120,000 ÷ 80 = 1,500 per event
Both cost and event count must cover the same period.
What may be included
The organization may include:
- Internal labor
- Contractor labor
- Spare parts
- Consumables
- External services
- Freight
- Equipment hire
The definition should remain consistent.
Choosing the event
An event may mean a work order, repair, intervention, or failure. The selected unit must be clearly defined before comparing results.
Important limitation
Average cost can hide a small number of very expensive failures and many low-cost jobs. Review the distribution and major-cost events as well.
Common mistake
Comparing sites that use different cost categories or work-order definitions produces misleading results.
How this term differs
Mean Maintenance Cost is the average cost per included maintenance event. It is related to Maintenance Cost per Asset, Maintenance Cost, and Maintenance Cost as Percentage of Replacement Asset Value, but these terms describe different records, measures, roles, strategies, or decisions and should not be used interchangeably.
Related concepts
Related maintenance terms
Keep exploring connected CMMS, reliability, and maintenance planning terms.
Maintenance Key Performance Indicator
A maintenance key performance indicator, or KPI, is a defined measure used to monitor whether maintenance processes and outcomes support business objectives.
Work Order
A work order is an authorized record that defines maintenance work to be performed, including the asset, priority, scope, assignee, instructions, labor, parts, status, and completion evidence.
Maintenance Cost as Percentage of Replacement Asset Value
Maintenance Cost as a Percentage of Replacement Asset Value compares annual maintenance spending with the estimated current cost of replacing the asset base.
Glossary FAQs
- What is the Mean Maintenance Cost formula?
Divide total maintenance cost by the number of defined maintenance events.
- What costs should be included?
Use a consistent scope such as labor, parts, contractors, services, freight, and consumables.
- Can average maintenance cost be misleading?
Yes. It can hide a small number of very expensive failures and many low-cost jobs.