Stock Cover Calculator
Days of stock remaining, the reorder point for a lead time, and how many days of margin are left.
Results
Days of cover
13.688
d
Daily consumption
328.767
Reorder point
9205.5
Days
-14.313
d
Inventory turnover
26.6667
What this tool does
A negative margin means you are already past the point where an order should have gone out — the stock will run dry before a replacement arrives. Note that this assumes steady demand: with lumpy or seasonal consumption, an average daily figure flatters the position badly and the safety days have to carry more weight.
Formula
coverage = inventory ÷ daily consumption
Variables
| Symbol | Meaning | Unit |
|---|---|---|
st | Stock on hand | — |
dm | Annual demand | — |
lt | Supplier lead time | — |
sf | Safety days | — |
DC | Days of cover | d |
DU | Daily consumption | — |
RP | Reorder point | — |
MG | Days | d |
TO | Inventory turnover | — |
Worked example
- Stock on hand4500
- Annual demand120,000
- Supplier lead time21
- Safety days7
- Days of cover13.688 d
- Daily consumption328.767
- Reorder point9205.5
- Days-14.313 d
- Inventory turnover26.6667
Limitations
- The result is an estimate based only on the values you type. Real situations often include factors this calculator does not know about.
- The formula assumes ideal conditions: no friction losses, no air resistance and no efficiency losses unless you enter them.