How do you calculate availability for OEE?

Divide operating (run) time by planned production time. With 420 run hours against 480 planned hours, availability is 420 ÷ 480 = 87.5%, meaning 60 hours were lost to downtime.

What is a good availability percentage?

World-class OEE assumes around 90% availability. Many discrete-manufacturing lines sit in the 80–85% range, so the 87.5% in this example is solid but still leaves 60 hours of recoverable downtime.

What counts as planned production time?

It is the total scheduled time the equipment is expected to run, after subtracting planned non-production time like breaks, no-demand periods, and scheduled maintenance. It does not subtract breakdowns or changeovers — those become your downtime loss.

Is availability the same as uptime?

They are close but not identical. Uptime often means the machine was powered and ready; availability specifically measures run time against planned time, so idling while waiting for parts still counts against availability.

Why is my availability low even with few breakdowns?

Changeovers and setup are the usual hidden culprits. Frequent short setups, minor stops, and material waits accumulate fast — in this example just 60 lost hours drops availability from 100% to 87.5%.

How does availability fit into the full OEE score?

OEE = Availability × Performance × Quality. Availability is the time component; even at 87.5% availability, your overall OEE will be lower once performance and quality losses are factored in.

OEE & Factory Performance calculator

Availability Calculator

Availability is the first of the three OEE factors and measures how much of your scheduled production time a machine or line actually spent running. It is calculated as operating (run) time divided by planned production time, and it isolates losses from breakdowns, changeovers, setup, and unplanned stops. Plant managers, maintenance engineers, and continuous-improvement teams track it daily because availability losses are usually the largest and most actionable chunk of lost capacity. A low availability number points straight at downtime events you can root-cause and eliminate.

What this calculator does

Calculate availability for OEE & Factory Performance — the share of planned production time the equipment was actually running.
Use it as the availability pillar of OEE in OEE & Factory Performance.
It computes availability as operating run time divided by planned production time, plus the resulting downtime in hours.

Formula used

Availability = operating time ÷ planned production time

Inputs explained

Operating (run) time: Time the equipment actually ran during the period.
Planned production time: Scheduled production time in the same period.

How to use the result

Use it at the end of a shift, day, or week to quantify how much scheduled time was lost to stoppages before rolling it into a full OEE figure.
Availability only captures time loss; it says nothing about whether the machine ran at full speed or produced good parts, so a high availability can still hide major performance or quality losses.

Current U.S. benchmarks

U.S. manufacturing runs at 75.6% of capacity (Federal Reserve, May 2026). New factory orders are up 2.3% year over year (Census).

Common questions

How do you calculate availability for OEE? Divide operating (run) time by planned production time. With 420 run hours against 480 planned hours, availability is 420 ÷ 480 = 87.5%, meaning 60 hours were lost to downtime.
What is a good availability percentage? World-class OEE assumes around 90% availability. Many discrete-manufacturing lines sit in the 80–85% range, so the 87.5% in this example is solid but still leaves 60 hours of recoverable downtime.
What counts as planned production time? It is the total scheduled time the equipment is expected to run, after subtracting planned non-production time like breaks, no-demand periods, and scheduled maintenance. It does not subtract breakdowns or changeovers — those become your downtime loss.
Is availability the same as uptime? They are close but not identical. Uptime often means the machine was powered and ready; availability specifically measures run time against planned time, so idling while waiting for parts still counts against availability.
Why is my availability low even with few breakdowns? Changeovers and setup are the usual hidden culprits. Frequent short setups, minor stops, and material waits accumulate fast — in this example just 60 lost hours drops availability from 100% to 87.5%.

Last reviewed 2026-05-12.