Use it when
You want to estimate months and days of cover from current stock, expected sales and supplier lead time, including the effect of an incoming order.
Inventory planning tool
Inventory Coverage
Calculator
Estimate how long your stock can support expected sales, what demand may consume during supplier lead time and where inventory may stand when a new order arrives.
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Turn inventory and sales assumptions into months and days of cover.
Step 01 / Inventory inputs
Measure stock
against demand.
Uses a 30-day month for planning.
The coverage math
Inventory measured
in time.
Months of cover divides available inventory by expected monthly sales. Lead-time demand estimates how many units could be consumed while waiting for the incoming order.
Current months of coverCurrent inventory ÷ expected monthly sales
Estimated lead-time demandExpected monthly sales × lead time days ÷ 30
This is a planning estimate, not a forecast. Seasonality, promotions, stockouts and demand changes can materially alter actual coverage.
When to use this tool
Measure inventory
in time, not just units.
Use another tool when
You need to compare inventory coverage with a supplier MOQ, purchase budget or storage cost. The MOQ & Inventory Risk Calculator adds those constraints.
Open advanced inventory analysis →Quick answers
Inventory coverage
FAQ.
What is months of inventory coverage?
It is current or projected inventory divided by expected monthly sales. It translates units on hand into an approximate amount of selling time.
Why include supplier lead time?
Because stock can be consumed while the replenishment order is being produced and transported. A healthy current stock level can still become a stockout risk if lead time is long.
Does this calculator forecast demand?
No. It uses the monthly-sales assumption you enter. Seasonality, promotions and demand changes should be tested with multiple scenarios.