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OEE and TEEP calculator

Enter the month’s time, stops, ideal cycle time and output to get availability, performance, quality, OEE and TEEP, the six big losses waterfall and how much money each OEE point represents.

Pre-sizing and estimating tool: results do not replace design, calculations or reports signed by a licensed professional, nor verification against the applicable codes and standards.

Preliminary estimate
Time in the period (one month)

Unscheduled shifts, weekends and holidays. Example: 22 days with two 8-hour shifts.

Availability and performance losses
Output
Value of the gain
Hidden capacity (TEEP)
Economic analysis
—OEE
—

Breakdown of total time

From the month’s total time down to net productive time, which corresponds to good parts at the ideal rate. Each step shows the time left and, to its right, the loss that separates it from the step above.

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KPIs against world-class benchmarks

Usual TPM benchmarks: availability 90%, performance 95%, quality 99.9% and OEE 85%.

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Cost of each additional part

Three ways to make more: raise OEE, run an extra shift in unscheduled time or buy another machine.

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The six big losses

Project payback

Cash flow of the improvement: investment in year 0 and annual savings escalated at the rate entered, discounted at the MARR.

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The report gathers this page's inputs, results, equations, assumptions and references, with fields for project, engineer and revision. In the print dialog, choose Save as PDF.

Method, assumptions and references

Equations used

Scheduled (loading) time = calendar − unscheduled − planned stops
Availability A = (scheduled − breakdowns − setups) ÷ scheduled
Performance P = ideal cycle time × total count ÷ operating time
Quality Q = good count ÷ total count; OEE = A × P × Q
TEEP = OEE × scheduled ÷ calendar
Value of ΔOEE (bottleneck with demand) = ΔOEE × scheduled × 3600 ÷ cycle × margin × 12
Value of ΔOEE (demand met) = scheduled × (1 − OEE ÷ (OEE + ΔOEE)) × hourly cost × 12

Assumptions and limits

  • Time and index definitions follow ISO 22400-2 and Nakajima’s TPM; planned stops sit outside OEE and inside TEEP.
  • Speed loss is the remainder of the performance loss after the recorded small stops.
  • The margin-based value only applies to a bottleneck with demand; otherwise the gain is fewer operating hours (labor, energy, overtime).
  • The new machine comparison annualizes its cost over 10 years at the discount rate and assumes the same OEE and scheduled time.

Standards and technical documents

  • ISO 22400-2:2014: Automation systems and integration — Key performance indicators (KPIs) for manufacturing operations management — Part 2: Definitions and descriptions
  • Nakajima, S. Introduction to TPM: Total Productive Maintenance. Productivity Press, 1988
  • SEMI E79: Specification for definition and measurement of equipment productivity
  • EN 15341:2019: Maintenance — Maintenance key performance indicators

U.S. regulations

  • OSHA 29 CFR 1910.147: lockout/tagout for servicing and maintenance, including setups and jam clearing
  • Fair Labor Standards Act (29 U.S.C. 207): overtime at 1.5 times the regular rate for hours over 40 per week
  • OEE itself is not regulated; it is an internal management metric

Frequently asked questions

How do you calculate OEE?

Multiply availability, performance and quality. With 87% availability, 82% performance and 97% quality, OEE is about 69%.

What is a good OEE?

The TPM world-class benchmark is about 85%. Many plants run between 45% and 65%. Tracking your own trend and attacking the largest loss is more useful than comparing with other plants.

What is the difference between OEE and TEEP?

OEE measures scheduled time. TEEP measures all calendar time and shows how much capacity sits in unscheduled shifts and days.