OEE Calculator.
Compute Overall Equipment Effectiveness for any machine or production line. OEE = Availability × Performance × Quality. World-class benchmark is 85%; typical Indian plants run 40–60%.
Availability — Time
Performance — Speed
Quality — Defects
Loss summary
Run time lost to breakdowns: — min
Speed loss vs ideal: — min
Defective parts: — units
Theoretical max output: — parts
OEE benchmarks
| OEE Range | Class | Typical Industry | Action |
|---|---|---|---|
| 85% + | World-class | Toyota Production System, top automotive Tier-1s | Maintain & document best practices |
| 70–85% | Good | Established Tier-1 / Tier-2 manufacturers | Targeted Kaizen on top loss |
| 60–70% | Acceptable | Most Indian Tier-1 / SME automotive | SMED, autonomous maintenance |
| 40–60% | Typical | Average Indian SME job-shops | TPM rollout, root-cause for top 3 losses |
| Below 40% | Low | Unmonitored shops, ad-hoc operations | Start with availability tracking — measure before fixing |
What is OEE?
OEE (Overall Equipment Effectiveness) is the gold-standard KPI for production efficiency. It rolls three losses — downtime, slow cycles, and defects — into one number that tells you what fraction of your planned production time was perfectly productive.
OEE Formula
OEE = Availability × Performance × Quality
Availability = Run Time / Planned Production Time
Performance = (Ideal Cycle × Total Count) / Run Time
Quality = Good Count / Total Count
Worked OEE Example
An 8-hour shift on a CNC machine.
- Planned Production Time = 480 min (8 hr)
- Stops (changeover, breakdowns) = 60 min → Run Time = 420 min
- Total parts produced in 420 min = 1,800 parts (Ideal cycle = 12 sec/part)
- Defects = 90 → Good parts = 1,710
- Availability = 420/480 = 87.5%
- Performance = (12 × 1800) / (420 × 60) = 21,600 / 25,200 = 85.7%
- Quality = 1,710 / 1,800 = 95.0%
- OEE = 0.875 × 0.857 × 0.95 = 71.2%
OEE Benchmarks
- ≥ 85% — World-class. Toyota / Honda level. Very few plants reach this.
- 60% – 85% — Industry-typical. Strong room for improvement.
- 40% – 60% — Below average. Significant losses to recover.
- < 40% — Crisis. Stop adding new work, fix the existing line first.
Six Big Losses That Kill OEE
- Equipment failures (Availability)
- Setup & changeover (Availability)
- Idling & minor stoppages (Performance)
- Reduced speed (Performance)
- Process defects (Quality)
- Reduced yield / startup losses (Quality)
How to Improve OEE
- Track losses, not OEE — improve specific losses; OEE follows.
- SMED for changeover — most plants can cut changeover 50% in 6 months.
- Autonomous maintenance — operator-led TPM catches issues before breakdown.
- SPC + Cpk — capable processes reduce quality losses dramatically.
Related Tools
For cycle time analysis, use Cycle Time Calculator. Calculate machining parameters with Speeds & Feeds. Quality losses tie directly to Cp/Cpk capability and DPMO / Sigma level. To quantify the financial impact of OEE losses, use Cost of Poor Quality.