Give Each Product Family a Usable Capacity Rate
How should a scheduler combine different product rates without overstating available capacity?
One rate for a mixed-product line can conceal the amount of time an order book requires. The answer is not to abandon averages. It is to use a rate that describes the work being scheduled.
Choose the denominator first
For each relevant product family, decide whether the rate represents good output per running hour or per scheduled hour.
A running-hour rate needs separate allowances for setup, stops, and other excluded time. A scheduled-hour rate may already contain those losses. Applying both treatments without checking can count the same loss twice.
Group products where the operating behavior is comparable. Preserve separate rates where pack configuration, handling, or process requirements materially change the work.
Add hours, not rates
In an explicitly hypothetical schedule, product A requires 12,000 units at 2,000 good units per running hour. It needs six running hours. Product B requires 6,000 units at 1,000 per running hour. It needs another six.
The combined workload is twelve running hours before any separately excluded transitions. Averaging the two rates to 1,500 and dividing all 18,000 units by that average happens to match here, but changing the quantity mix breaks that shortcut. Summing each order's required hours preserves the actual mix.
Use a common unit or a documented conversion when comparing packs, cases, and weight. A unit-rate improvement can coexist with a lower weight rate when pack size changes.
Represent uncertainty where it matters
Show the observed spread within each family, the sample size, and the conditions represented. A historical percentile is an observation about the sample, not a guaranteed future floor or ceiling.
Test the schedule under credible slower conditions and identify which deliveries move. The service commitment should reflect that exposure and the available recovery options.
Keep newly introduced materials and products marked as provisional until relevant trial evidence exists. Do not borrow an established family's rate solely because the labels look similar.
The output is a schedule with explainable hours: production load by family, transition load, available time, and explicit uncertainty. That is enough to show whether the next order requires a new operating choice.