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OEE calculator and formula: availability × performance × quality
Overall equipment effectiveness from run time, ideal cycle time and good parts, split into its three rates per NF E60-182. Free, no sign-up.
- Instant result
- Formula and standards shown
- On desktop and phone
Result
75.21%OEE
- Availability rate
- 87.50%
- Performance rate
- 90.48%
- Quality rate
- 95.00 %
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What is OEE?
OEE (overall equipment effectiveness) is the share of the required production time that a machine actually spends making good parts at its ideal speed. It is the product of three rates: availability, performance and quality. The indicator comes from Seiichi Nakajima's total productive maintenance (TPM), is defined in ISO 22400-2:2014, and is standardised in France as TRS by NF E60-182.
For maintenance, OEE turns breakdowns into lost output that production understands. Availability falls with each failure and each long changeover; performance falls with minor stops and reduced speed, which often go unrecorded; quality falls with scrap and start-up rejects. In the example on this page, availability is 87.5%, performance 90.5% and quality 95%, for an OEE of 75.2%: the largest loss is the hour of stoppage.
Availability losses
Breakdowns, setups and adjustments. They are counted in time: the machine was required and did not run.
Performance losses
Idling, minor stops and reduced speed, measured against the ideal cycle time. This is why that time must be the rated one and not an observed average.
Quality losses
Defects, rework and start-up yield losses. A part reworked afterwards does not count as good in the OEE.
Required time, not calendar time
OEE is measured over the time production planned to run. A weekend or a shift with no orders lies outside that time and does not lower it.
Reference documents : ISO 22400-2:2014, KPIs for manufacturing operations management ; NF E60-182 (TRS) ; Seiichi Nakajima, Introduction to TPM (Productivity Press, 1988)
OEE results filed with the work order
Here, the calculator is free and the result is gone when you close the page. In Reglova, it is attached to the work order on the right machine: you find it again at the next breakdown, and on audit day.
The CMMS software comparison, our gaps included- Attached to the work order with its inputs: the server recalculates it, it stays verifiable.
- On the technician's phone, even without a network.
- In the machine's history, for the next breakdown.
When to calculate OEE on a line
01
Follow a line shift by shift and see which of the three rates pulls OEE down.
02
Put a figure on an improvement: fewer minor stops raise performance, less scrap raises quality.
03
Speak the same language as production, which often displays its OEE already.
Good to know
The ideal cycle time is the machine's rated cycle time, not an observed average. A performance rate above 100% almost always means the ideal cycle time entered is too long.
OEE formula: availability × performance × quality
OEE compares the time spent making good parts with the required time. It breaks down into three rates: availability (is the machine running?), performance (is it running at its rated speed?) and quality (are the parts good?). The calculation follows the French standard NF E60-182, where OEE is called TRS.
Formula · Reference documents
A = operating time/required time ; P = parts produced·ideal cycle time/operating time ; Q = good parts/parts produced ; OEE = A·P·Q = good parts·ideal cycle time/required time
NF E60-182 (French standard, OEE is called TRS)
Inputs and accepted ranges
| Input | Unit | Accepted range | Example |
|---|---|---|---|
| Required time | min | 0.01 to 10,000,000 | 480 min |
| Operating time | min | 0.01 to 10,000,000 | 420 min |
| Ideal cycle time | min | 0.0001 to 100,000 | 1 min |
| Parts produced | 1 to 1,000,000,000 | 380 | |
| Good parts | 0 to 1,000,000,000 | 361 |
Calculated results
- OEE%
- Availability rate%
- Performance rate%
- Quality rate%
What the calculator flags
- Performance above 100%: check the ideal cycle time.
Stops that pull OEE down, handled as work orders
- Breakdowns reported by QR code
- Work orders on the phone, even without a network
- Mandatory inspections reminded by email
- Audit file as a PDF, in one click
Free during the beta, no credit card