Method / assumptions / examples
How this calculation works
The result is deterministic: the same measurements always return the same estimate. Here is the relationship and where real-world results can differ.
Formula
Total time = quantity ÷ (rated speed × efficiency) + setup time
Efficiency derates the ideal hourly speed for expected micro-stops and normal operating loss. Setup is added separately so assumptions stay visible.
Worked example
Examples
At 12,000 units/hr, 85% efficiency, and 45 minutes of setup, the job takes about 5 hours 39 minutes.
Common mistakes
What to check before using the result
- Base efficiency on a comparable product and process rather than a broad plant average.
- Add curing, inspection, packing, or queued time separately if those steps constrain delivery.
- If the line runs in batches or multiple lanes, make sure rated speed and required quantity use matching output units.
FAQ
Frequently asked questions
Is efficiency the same as OEE?
Not necessarily. Use a realistic speed factor for this estimate. OEE also includes availability and quality, and can be used when its process boundary matches your plan.
Should breaks be included?
Include planned breaks in setup or add them to the final schedule if the machine will not produce during that time.