Skip to content 
EN 
DE 
العربية 
Machine Availability: What It Measures, the Formula, and Its Place in OEE
Machine availability is the share of scheduled time a machine was actually able to run: uptime divided by planned production time. It’s one of the three legs of OEE, and it’s the one downtime hits directly. High availability alone doesn’t mean high output, but low availability caps everything above it.
Why does machine availability matter?
Machine availability matters because it sets the ceiling on everything else a machine can produce: no amount of speed or quality buys back time it wasn’t running. As one of the three legs of OEE, it is the leg downtime hits directly, so a low figure caps output however well the line performs otherwise. Measuring it honestly is the first step to finding where production time is really being lost.
How is machine availability calculated?
It’s uptime measured against the time you planned to run:
- Start with planned production time, the scheduled running hours.
- Subtract the downtime, both breakdowns and setup or changeover stops.
- Divide the remaining run time by the planned time.
- The result is availability, usually shown as a percentage.
How does availability fit into OEE?
Availability inside OEE at a glance
Where availability sits and what drags it down.
| OEE factor | Measures | Main loss |
|---|---|---|
| Availability | Run time vs planned time | Downtime, setup |
| Performance | Speed vs designed | Minor stops, slow cycles |
| Quality | Good parts vs total | Scrap, rework |
Related Terms
- Mean Time Between Failures (MTBF) – higher MTBF lifts availability.
- Mean Time to Repair (MTTR) – lower MTTR lifts availability.
- Condition Monitoring System
