TOOLSFOR FACTORIES

Equipment / WORKSHEET 02

OEE calculator

Break a production run into its availability, performance, and quality factors. OEE is their product and helps expose where planned production time was lost.

Output
Availability, performance, quality, OEE, run time, and the theoretical production count.
Processing
In this browser only
Cost
Free · no account

LIVE WORKSHEET

Measure one production run

Runs locally

Inputs and results stay in this browser. Verify important outputs independently.

APPLICATION NOTES

Use the result on the floor

Calculate availability, performance, quality, and overall equipment effectiveness from a production run. Keep the input boundary, unit definitions, and time period attached to any recorded result so another person can reproduce it.

Useful for

  • Review a machine or line for one shift.
  • Compare loss categories before an improvement project.
  • Check how downtime, speed loss, and defects affect the combined metric.

MODEL BOUNDARY

Assumptions and limitations

Assumptions

  • Downtime occurs within planned production time.
  • Ideal cycle time uses the same unit definition as total count.
  • Good count is included in total count.

Limitations

  • OEE comparisons are only meaningful when scope and counting rules are consistent.
  • A high OEE does not demonstrate product conformity, safety, profitability, or customer service.

DECISION CHECK

Verify before changing the process

Do not use OEE as a standalone personnel target. Confirm the ideal cycle definition and loss boundaries, and investigate unsafe speed or hidden quality tradeoffs.

REFERENCE

Frequently asked questions

How is OEE calculated?

OEE is availability multiplied by performance multiplied by quality.

Can performance exceed 100%?

The raw formula can exceed 100% when the entered ideal cycle is slower than actual production. That usually signals a baseline or data-definition issue and is flagged here.

Does planned maintenance count as downtime?

Only if it is inside the planned production time used as the denominator. Define this boundary consistently.

NEXT PROCESS

01Downtime Pareto analyzer from CSVAnalyze a local CSV of downtime categories and durations into a ranked Pareto table with cumulative percentages.02First-pass yield calculatorCalculate first-pass yield and first-pass defects from units entering a process and units accepted without rework.03Cycle time and capacity calculatorEstimate hourly and shift production capacity from cycle time, parallel stations, utilization, and net shift time.