The WooCommerce Inventory Calculator estimates how many days current and incoming stock can support expected sales while preserving a safety-stock buffer. It is designed for merchants who need a quick view of stock coverage before placing a purchase order or planning a promotion.
The result separates total available units from the portion that can be sold before the safety threshold is reached. This makes the estimate more conservative than simply dividing all inventory by daily sales.
1. Set the reporting scope
Enter physical units currently available for sale.
2. Enter the primary value
Add confirmed incoming units expected before stock is depleted.
3. Add supporting inputs
Enter the average number of units sold per day using a representative period.
4. Review the result
Set the safety stock you want to keep as a buffer.
5. Compare and act
Review sellable coverage and total coverage, then compare the result with supplier lead time.
Where:
The calculator uses the entered values directly and rounds only for display.
Use the result as a planning estimate and compare it with consistent historical data.
Actual WooCommerce reports may differ because of tax settings, refunds, fees, timing, and data definitions.
Only include units that are expected to arrive before existing stock runs out. Uncertain purchase orders should be modeled separately.
Use a period that reflects current demand. A shorter period reacts faster to trends, while a longer period smooths volatility.
Coverage cannot be meaningfully calculated. The tool will still show available stock but not a days-of-cover result.
Use it for one SKU or for a group whose units are genuinely interchangeable. Combining unrelated products can hide shortages.
Coverage estimates how long inventory lasts. A reorder point identifies the stock level at which a replenishment order should be placed.