Uptime and downtime
Machine Availability Calculator
Enter planned production time and downtime to get machine or equipment availability — the first factor in OEE.
Availability = (Planned time − Downtime) ÷ Planned time × 100
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Availability
Share of planned time the machine actually ran
(480 − 40) ÷ 480 = 91.7%
How the calculation works
Availability = (planned time − downtime) ÷ planned time × 100. It’s the share of planned production time a machine actually ran. Higher availability is better.
Planned time leaves out hours you never meant to run, like holidays or shifts with no orders. Downtime includes breakdowns, changeovers and setups inside those hours.
There’s a second route to the same number: availability = MTBF ÷ (MTBF + MTTR), the standard reliability-engineering definition. Use whichever figures you already have. Availability is also the first factor in OEE.
This calculator is for one machine over one period, entered by hand. MachDatum CMMS tracks downtime per asset from breakdown work orders, so the downtime figure is already on record.
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Frequently asked questions
Availability is the fraction of planned production time a machine was actually running. It is calculated as running time divided by planned production time, and is one of the three components of OEE (alongside Performance and Quality).
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Tracking this metric by hand?
MachDatum CMMS calculates it for you. No spreadsheets, no manual tally.