Free Tool
OEE Calculator
Calculate your Overall Equipment Effectiveness score instantly. Enter your three OEE components and see where your plant stands vs world-class benchmarks.
OEE Calculator
Enter each component as a percentage (0–100).
Actual run time ÷ Planned production time × 100
Actual output rate ÷ Theoretical maximum output rate × 100
Good units ÷ Total units started × 100
What is OEE? The complete guide for plant managers
Availability
Run Time ÷ Planned Time × 100
Measures losses from equipment breakdowns, setup delays, and material waits. Target: ≥ 90%.
Performance
Actual Rate ÷ Ideal Rate × 100
Measures speed losses — micro-stoppages, reduced speed, and operator or material inefficiencies. Target: ≥ 95%.
Quality
Good Units ÷ Total Units × 100
Measures quality losses — defects, scrap, and rework. Includes startup yield losses. Target: ≥ 99%.
OEE benchmarks at a glance
Frequently asked questions about OEE
What is OEE and how is it calculated?+
OEE (Overall Equipment Effectiveness) measures manufacturing productivity as a percentage. It is calculated by multiplying three components: Availability (actual run time ÷ planned production time), Performance (actual output rate ÷ theoretical maximum output rate), and Quality (good units ÷ total units started). OEE = Availability × Performance × Quality. A world-class OEE score is 85% or higher.
What is a good OEE score?+
World-class OEE is 85% or above. An OEE of 65-84% is considered good and above average for most manufacturers. 45-64% is typical — the industry average for manufacturers not actively managing OEE. Below 45% indicates significant improvement is needed across one or more OEE components.
What is the difference between Availability, Performance, and Quality in OEE?+
Availability measures the percentage of planned production time the machine was actually running (accounts for breakdowns, setup delays, and material waits). Performance measures how fast the machine ran versus its theoretical maximum speed. Quality measures the percentage of total output that met quality standards without rework. All three must be high for world-class OEE.
How can I improve my OEE score?+
Start by identifying which of the three OEE components — Availability, Performance, or Quality — is lowest, then focus improvement efforts there. If Availability is low, investigate breakdown frequency and setup times. If Performance is low, look for speed losses and micro-stoppages. If Quality is low, investigate defect root causes. AI tools like OpsOracle can automatically identify which machine or shift is causing the largest OEE drop from your production data.
What causes low OEE in manufacturing?+
Low OEE is caused by the Six Big Losses: equipment breakdowns, setup and adjustment time, idling and minor stoppages, reduced speed, process defects, and reduced yield during startups. OEE analysis helps identify which of these losses is the primary driver so maintenance and production teams can focus on the highest-impact fix.