Production and OEE
What is Cycle time?
Cycle time is how often a process completes one unit. Learn the formula, ideal versus actual cycle time, how it feeds OEE, and use the free calculator.
Quick answer
Cycle time in manufacturing is the time a process takes to complete one unit, measured from one finished unit to the next. Average cycle time equals net production time divided by units produced. It is compared with takt time to see whether a step can keep up with demand.
Updated 30 October 2026. Written by the Ajinkya Technologies engineering team, reviewed by Amey Kadle.
Formula
Average cycle time = net production time ÷ units produced
Worked example: A machine ran for 400 minutes (24,000 seconds) after stops and produced 720 parts. Average cycle time = 24,000 ÷ 720 = 33.3 seconds per part. Against a takt time of 30 seconds, it is 11 percent too slow.
Cycle time calculator
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- Average cycle time
- 33.3 seconds per unit
- Against takt
- 11.1% slower than takt
Cycle time explained
Cycle time is used in three slightly different ways, and mixing them up causes most disputes about line performance. Machine cycle time is the time the machine itself takes for one part. Operator cycle time includes loading, unloading and walking. Observed or average cycle time is what the process actually achieves over a period, including the small losses between parts.
Ideal cycle time, the fastest proven time for one unit under good conditions, is the reference used in OEE. The performance factor of OEE compares ideal cycle time multiplied by the units produced with the run time available, so slow cycles and short stops show up as performance loss rather than disappearing into the average.
Cycle time is not lead time. Lead time is how long one unit spends in the whole process, including queues between steps, and in most plants it is many times the sum of the cycle times. Shortening cycle time at a step that is not the constraint rarely improves output; finding the step whose cycle time is closest to or above takt is where improvement pays.
Key concepts
- Machine, operator and observed cycle time differ
- Ideal cycle time is the OEE reference
- Cycle time is not lead time
- The constraint is the step closest to takt
- Measure automatically to catch short stops
Questions
How do you measure cycle time accurately?
Use a cycle signal from the PLC or a sensor and timestamp every part. Stopwatch studies miss variation and short stops, which are often the largest hidden loss.
What is ideal cycle time?
The fastest cycle time the process has proven it can sustain for that product, used as the reference for the OEE performance factor. It should not be the nameplate speed if the machine has never achieved it.
Is cycle time the same as throughput time?
No. Throughput time, or lead time, includes waiting and transport between steps. Cycle time is the time for one unit at one step.
Why does average cycle time drift upwards during a shift?
Common causes are tool wear, material variation, operator fatigue and short stops that are not recorded. Logging cycle time per part shows when and where the drift starts.
References
How we help with cycle time
We capture a cycle signal from each machine, often from an existing PLC without changing its program, and compare every cycle with the ideal and with takt on the line dashboard.
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