What this calculator does
OEE combines time loss, speed loss, and quality loss into one percentage. The result is most valuable when its three factors are retained, because the same OEE can hide very different operational problems.
When to use it
Use OEE to trend a consistently defined production asset, line, or cell. It supports improvement prioritization; it should not become a reason to hide planned maintenance, quality holds, or chronic loss categories.
Inputs and formula
Availability = run time ÷ planned production time; performance = ideal cycle time × total units ÷ run time; quality = good units ÷ total units. The calculator converts the entered ideal cycle time from minutes into hours before comparing it with run time. OEE = availability × performance × quality
Worked example and interpretation
With 8 planned hours, 1 downtime hour, 800 units at 0.5 minutes each, and 760 good units, OEE is about 79.2%. Review the weakest factor before choosing an action.
Practical notes and limitations
Performance over 100% usually means the ideal cycle time, clock, or unit count is wrong. Define planned time and quality disposition consistently. OEE is not a financial measure; combine it with downtime cost for economic prioritization.