Construction Material Inventory Runout Calculator
Estimate how long current material stock will last, then check whether a scheduled receipt arrives before the projected runout point.
Inventory inputs
Inventory coverage
How inventory runout is calculated
Safety stock can be treated as protected inventory rather than ordinary operational stock. That leaves a smaller quantity available before a replenishment risk is triggered.
Days of cover = operational stock ÷ daily consumption
Stock at receipt = current stock − consumption until receipt
Stock after receipt = stock at receipt + receipt quantity
Worked example
85 units of current stock less 15 units safety stock leaves 70 operational units. At 12 units per day, the usable inventory covers about 5.83 days.
Why the scheduled receipt matters
If a 60-unit delivery arrives in four days, approximately 37 units are consumed before the receipt under a steady-use assumption. The calculator then adds the received material back into the stock position.
What runout means here
This is a planning runout rather than a guarantee of an exact site date. Consumption may accelerate or stop, and deliveries can be delayed.
Frequently Asked Questions
What are days of cover?
The number of consumption days supported by operational stock.
Can safety stock be protected?
Yes.
Can incoming material be included?
Yes.
Does the calculator use calendar dates?
No; it uses elapsed days from the entered receipt interval.