Average use is an assumption
Stable daily consumption is a planning simplification. Seasonal demand, one large contract or material substitutions can make the average misleading, so update it when the workload changes.
PROCUREMENT LEAD-TIME
Turn inventory into
a reorder clock.
Model how long current and confirmed incoming material can support average consumption, then compare that cover with supplier lead time plus your chosen safety window.
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Combine consumption with lead time
Days of cover and trigger
Effective stock–stock + incoming
Days of cover–at entered daily use
Lead + safety need–units
Order in–days
MODEL
Enter supply assumptions.
The tool uses average daily consumption and does not model supplier variability.
Lead time converts a stock number into a timing problem.
Safety cover protects time
Safety days are added to supplier lead time before calculating the trigger quantity. They are a policy choice, not a prediction of supplier reliability.
Incoming must be credible
Include confirmed incoming only when you are prepared to plan against it. A purchase request that has not been accepted by the supplier is not the same as material arriving on time.