Production Completion Date Planner
Calculate when a production order will complete given daily capacity and a start date. See whether the due date is achievable and what to do if it is not.
Production will complete in 5 days.
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How this works
Production completion date planning turns an order quantity and a daily production rate into a working-calendar completion date. The engine calculates the number of working days needed as the order quantity divided by effective daily capacity, rounded up. It then advances that many working days from the start date, skipping non-working days according to the selected work week.
When a due date is provided, the engine also calculates the buffer: the difference between available working days and days actually needed. A positive buffer means the order finishes with room to spare. A negative buffer means the order will finish late, and the engine shows the capacity increase, earlier start date, or renegotiated date that would close the gap.
Assumptions
- Capacity is constant across all working days in the schedule
- Working days follow a simple weekday pattern, not a holiday calendar
- Capacity utilization (OEE) applies uniformly, not per shift or per day
- Production cannot be split across a partial day; work spills to the next working day
Limitations
- Does not model mixed-product schedules or sequence-dependent setup time
- Does not account for holidays, only weekday and weekend patterns
- Does not model variable capacity such as planned overtime or maintenance windows
Sources
Finite scheduling and capable-to-promise formulas follow the APICS CPIM Body of Knowledge and Manufacturing Planning and Control for Supply Chain Management (Vollmann, Berry, Whybark, Jacobs, 6th edition), Chapters 3 and 9.
Worked example
An order for 1,000 units needs to ship by a due date, and the line runs 200 units per day on a standard Monday-to-Friday schedule starting today. That is 5 working days needed (1,000 divided by 200). If today is a Monday, the order completes that Friday. If the due date is the following Monday, the order finishes with 1 day of buffer and is feasible. If the daily capacity were only 150 units per day instead, the same order would need 7 working days and finish 2 working days late, and the engine would show the extra daily capacity, the earlier start date, or the later commitment date that would close that gap.
Common use cases
- Manufacturing order promising against a customer due date
- Custom fabrication and made-to-order production scheduling
- Batch processing runs with a fixed daily throughput rate
- Job shop scheduling where a single order occupies the primary work center