This inventory calculator estimates ending physical-product units from starting stock, inbound receipts, sales, and other unit reductions. It gives operators a quick stock-position check for a SKU, warehouse, or product group over a defined period.
The estimate supports replenishment reviews and reconciliation work. It is not a substitute for a physical count, especially where damage, theft, mis-picks, bundles, or delayed system updates can create discrepancies.
1. Enter starting inventory. Use values from the same product, SKU group, and reporting period.
2. Enter units received. Use values from the same product, SKU group, and reporting period.
3. Enter units sold. Use values from the same product, SKU group, and reporting period.
4. Enter other reductions. Use values from the same product, SKU group, and reporting period.
5. Review the result. The calculator updates automatically as inputs change. Use Reset to restore the example values.
The displayed value summarizes estimated ending units using the inputs entered above.
Use consistent units and matching reporting periods. Results are estimates for planning and review.
Given: 800 starting units, 250 received, 620 sold, and 15 other reductions.
Calculation: 800 + 250 − 620 − 15 = 415.
Result: Estimated ending inventory is 415 units.
Examples include damage, samples, shrinkage, and manual write-offs.
You can, but SKU-level calculations are usually more actionable because replenishment differs by item.
It indicates inconsistent inputs, missing receipts, overselling, or timing differences.
Only add returned units that are actually restocked and sellable.
Unposted transactions, warehouse errors, shrinkage, and bundle-component movements can cause variance.