Material Delivery Frequency Calculator
Estimate how many working days one material delivery will cover, how many deliveries the project may need and whether supplier lead time creates a replenishment risk.
Consumption and supply inputs
Delivery frequency result
How delivery frequency is calculated
The core interval is the material quantity received divided by the expected daily consumption. A safety-stock percentage can then increase the quantity available between replenishment events.
Buffered quantity = delivery quantity × (1 + safety stock)
Buffered coverage = buffered quantity ÷ daily consumption
Project deliveries = ceiling(project working days ÷ buffered coverage)
Worked example
A 120-unit delivery at 18 units per working day covers about 6.67 working days before safety stock. With 10% additional stock, the modeled coverage increases to about 7.33 days.
Lead-time check
If supplier lead time approaches or exceeds the stock coverage period, replenishment may need to be ordered earlier. The calculator flags this relationship rather than pretending lead time is irrelevant.
Why averages can mislead
A concrete-intensive week may consume much more material than a preparation week. Project teams should compare the average with peak planned consumption when setting a practical delivery schedule.
Frequently Asked Questions
Can I use bags or pieces?
Yes.
Does safety stock change delivery frequency?
It can extend the modeled stock coverage when the buffer is added to each delivery.
Does lead time automatically create an order date?
No.
Can consumption vary?
Yes; use a representative or phase-specific rate for planning.