Uptime and downtime
OEE Calculator — Overall Equipment Effectiveness
Enter planned time, running time, cycle time, and piece counts to get OEE — and see the Availability, Performance, and Quality behind it.
OEE = Availability × Performance × Quality
Your numbers
OEE
Overall Equipment Effectiveness
OEE = 91.7% × 90.9% × 95% = 79.2%
How the calculation works
OEE = Availability × Performance × Quality. Availability is running time ÷ planned time; Performance is (ideal cycle time × total pieces) ÷ running time; Quality is good pieces ÷ total pieces. It’s the share of planned time spent making good parts at full speed. Higher OEE is better.
Because the three factors multiply, a small loss in each adds up quickly. The factor split in the result shows which one is costing you most: stops, slow running or scrap.
Availability is usually where maintenance has the most influence, through MTBF and MTTR. Performance and Quality depend as much on process, tooling and materials.
This calculator is for one machine over one shift or period, entered by hand. In MachDatum CMMS, breakdown work orders record the downtime behind the Availability factor, per asset.
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Frequently asked questions
OEE (Overall Equipment Effectiveness) measures how much of planned production time is truly productive. It multiplies Availability (was the machine running?), Performance (was it running at full speed?), and Quality (were good parts produced?) into a single percentage.
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Tracking this metric by hand?
MachDatum CMMS calculates it for you. No spreadsheets, no manual tally.