Automotive Line Rate and Capacity Calculator
Customer capacity reviews and quote packages both ask the same question: can this line make the required volume? This calculator turns cycle time, shift pattern and OEE into capacity and compares it to demand.
Your numbers
Breaks, meetings and planned stops that are not production time.
Cavities or parts made per machine cycle.
Your results
Simple deterministic model. It ignores changeover mix, demand peaks, maintenance windows and ramp-up. Many customers require a capacity study with a buffer for peak demand, so add your own safety margin.
Annual capacity vs OEE
Sweeps Expected OEE from 40 to 95, holding your other inputs fixed.
Live capacity from your ERP
Optional: ask how routings, work centers and OEE data could drive this check automatically.
Optional. The tool and every export work without this. No spam.
How to use it
Enter your shift pattern, planned breaks, production days and weeks, the ideal cycle time and parts per cycle, and the OEE you can realistically expect. Add the customer's annual demand. The outputs show daily and annual capacity, utilization against demand, takt time and the OEE you need to hit the volume. If the required OEE is above what the line has ever achieved, you have a capacity gap to solve with another shift, a faster cycle or another line.
The formulas
Net available time is shift length minus planned breaks, multiplied by shifts. Ideal output is available seconds divided by cycle time, multiplied by parts per cycle. Real output applies OEE, which combines availability, performance and quality. Takt time is available seconds divided by the average daily demand. Required OEE is daily demand divided by ideal daily output. Demand is spread evenly across the production days, which understates peak weeks.
- Utilization above 85 percent leaves little room for variation
- Takt time shorter than the cycle time means you need parallel capacity
- Quality loss is included in OEE, so use good parts
Common mistakes
Using nameplate cycle time instead of the demonstrated one, forgetting changeover and warm-up inside OEE, and ignoring that customers can request volumes above the nominal planning figure all lead to missed commitments. Use OEE from actual data, ideally from your MES or ERP shop floor reporting, and run the calculation again for the high-volume scenario that the customer lists in the quote. Do not count planned maintenance as production time.
Frequently Asked Questions
What OEE should I use?
Use demonstrated OEE for the line or a similar one over several months, not the target. For a new line, use a ramp curve and an average that reflects launch losses. A figure from supplier proposals is usually optimistic.
How is takt time different from cycle time?
Takt time is how often the customer needs a part, based on demand and available time. Cycle time is how often the process makes one. If takt is shorter than cycle time per part, one line cannot meet demand.
Does this handle multiple parts on one line?
Not directly. For multiple parts, run the calculator per part with the share of available time each one uses, or use a worksheet that sums the load by part including changeovers.
Why do customers ask for a capacity study?
Automotive customers want evidence you can meet the peak requirement, often a percentage above nominal demand, because a supply interruption can stop their line. APQP asks for capacity analysis as part of feasibility and launch readiness.
Netray can pull cycle times, OEE and demand from your ERP and MES so capacity checks use live data. The calculator works on its own.
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