How to Track Machine Utilization Without Confusing It With OEE

Machine utilization answers one question: how much of the chosen available time did the machine run? It does not tell you whether the machine ran at ideal speed or produced good parts. That is why utilization and OEE must stay separate.

Optiwise supports both views. Use utilization when you want capacity and asset loading. Use OEE when you want availability, performance and quality together.

Direct answer

Machine utilization is running time divided by the chosen time base; OEE is different because it also includes performance speed and quality output.

Factory example

A machine runs six hours in an eight-hour scheduled shift. Utilization is 75% if scheduled time is the denominator. If one hour was planned maintenance, utilization against available time is 86%. The report must show which denominator is used, or the same day can look like two different results.

Implementation path in Optiwise

1. Choose scheduled time or available time as the denominator.
2. Capture running, idle, planned stop and unplanned stop states.
3. Review low-utilization reasons by machine, product and shift.

Worksheet for your factory

Use this as the working checklist before you change software settings, write SOPs or ask the team to follow a new report.

Record	What to capture	Why it matters
Calendar time	24 hours in the day	Useful for asset-use comparison
Scheduled time	Shift hours planned for production	Best denominator for daily supervisor review
Available time	Scheduled time minus planned shutdown	Useful when maintenance or trials are excluded
Running time	Time the machine was actually running	Numerator for utilization
Planned shutdown	Holiday, maintenance, trial or no-plan time	Must be recorded or utilization becomes unfair
Unplanned stop	Breakdown, no operator, no material, tool issue	Actionable loss category

How Optiwise supports this workflow

• Use shift and production plans to define the time base before comparing utilization.
• Capture machine running, idle and stop states through IoT where the machine is connected.
• Keep utilization separate from OEE dashboards so speed and quality losses are not hidden.
• Link downtime reasons to production records so low utilization leads to a clear action.

Explore the connected Optiwise workflows for production, inventory, purchasing, quality, IoT, and AI agents.

Checks before you use the number for decisions

• Confirm the owner of the record and the person who reviews exceptions.
• Write the unit of measure, time period and source system beside every number.
• Mark missing, stale or manually corrected data instead of hiding it inside the final score.
• Keep approval evidence for changes that affect stock, production, quality or customer commitments.

Reference source

For general manufacturing ERP and MRP context, compare this workflow with Deskera MRP resources, then adapt the records to your own factory process.

FAQs

What is the formula for machine utilization?

Machine utilization equals running time divided by the chosen time base, usually scheduled time or available time. Write the denominator beside every report.

Can utilization be high while OEE is low?

Yes. A machine can run for most of the shift but run slowly or produce rejects. That gives high utilization and lower OEE.