Equipment Effectiveness (OEE) Calculator
Measure how much of planned production time is truly productive.
OEE
79.17%
- Availability
- 87.50%
- Performance
- 95.24%
- Quality
- 95.00%
- Fully productive time
- 380 minutes
Calculated from the values you entered. Formula version 1; last reviewed 2026-09-15.
What this calculator does
The product of availability, performance and quality, each measured from the shift's own records. All five inputs are measured on the line. No world-class benchmark is applied to the result.
Inputs and what they mean
- Planned production time
- — number value.
- Run time
- — Planned time minus unplanned stops..
- Ideal cycle time
- — number value.
- Total units produced
- — number value.
- Good units
- — number value.
How to use it
- Enter your own figures — the calculator never fills in a rate, price or benchmark for you.
- Press Calculate to see the result.
- Read the formula, variables, assumptions and source below the result before you rely on it.
Formula
Availability = Run time ÷ Planned production time; Performance = (Ideal cycle time × Total count) ÷ Run time; Quality = Good count ÷ Total count; OEE = Availability × Performance × Quality
Worked example
Eight-hour shift with 60 minutes of unplanned stops
800 units produced, 760 good, ideal cycle 0.5 minutes.
Reading the result
The headline figure is the main answer. Any breakdown underneath shows the parts that make it up, so you can check the working and see what changes when you adjust an input.
Limitations and assumptions
Results depend entirely on the figures you enter and are rounded for display. They are for general information and education, not professional advice.
Reference: NIST MEP — Lean manufacturing measures: takt time and overall equipment effectiveness
Last reviewed:
Common questions
Formula, source and verification
The product of availability, performance and quality, each measured from the shift's own records.
The question it answers: How much of our planned production time actually produced good parts?
The formula
Availability = Run time ÷ Planned production time; Performance = (Ideal cycle time × Total count) ÷ Run time; Quality = Good count ÷ Total count; OEE = Availability × Performance × Quality
- PPT — Planned production time
- (min). Scheduled time excluding planned shutdowns.
- RT — Run time
- (min). Planned time minus unplanned stops.
- ICT — Ideal cycle time
- (min). Fastest sustainable time per unit.
- TC — Total count
- (count). All units produced, good and bad.
- GC — Good count
- (count). Units meeting specification first time.
Units: Minutes and counts in; percentages out.
What kind of calculation this is
Deterministic formula. The same inputs always give the same answer. The maths is fixed and does not depend on judgement.
Method
All five inputs are measured on the line. No world-class benchmark is applied to the result.
Published alternatives
More than one published form of this calculation exists. Each one assumes something different, so the right one depends on your situation.
Availability × Performance × Quality (used by default)
OEE = (Run time ÷ Planned time) × (Ideal cycle × Total count ÷ Run time) × (Good ÷ Total)
Use it when: Use when run time and counts are recorded separately.
It assumes: The ideal cycle time is the true best-case rate for the equipment.
Good parts against planned time
OEE = (Ideal cycle × Good count) ÷ Planned production time
Use it when: Always equivalent to the three-part form when the same figures are used.
It assumes: The ideal cycle time is the true best-case rate for the equipment.
Assumptions built into the result
- Operational: Ideal cycle time is the demonstrated best sustainable rate for the equipment.
Figures this calculator will never guess for you
- No 85% world-class target or other benchmark is inserted into the calculation.
Limitations
- A measure of equipment loss. It says nothing about demand, cost or profitability.
Source and version
- Standard or reference
- Overall equipment effectiveness (OEE as described in lean manufacturing guidance published by NIST MEP.)
- Published source
- NIST MEP — MEP guidance
- Formula version
- Version 1
- Verification
- Reviewed against the cited source on
- How much weight the source carries
- Standards or government
- Applies to
- Currency
- The result is a ratio or index, so it does not depend on currency.
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