Inventory Turnover Calculator: Find the Warehouse Loan on Your Shelves
Your aggregate turnover ratio hides the slow movers. Segment by category to find which SKU group is acting as an interest-free loan to your shelves, and what it’s costing you per year in capital and carrying cost.
Inventory Turnover Calculator
Find slow-moving stock, calculate carrying costs, and see the Warehouse Loan hiding on your shelves.
How to Read Your Results
Warehouse Loan figure
The EUR value of inventory that hasn’t moved within your defined slow-moving threshold. You paid cash to buy it, it’s sitting on a shelf, and you’re paying to keep it there while it earns nothing. It will become cash again, but on a timeline you don’t control.
Carrying cost shown
The annual cost of holding that inventory: warehouse space, insurance, spoilage risk, and capital tied up. The calculator uses a 20-25% rate as a standard approximation. Your actual rate may be higher if you have expensive warehouse space or perishable stock.
Capital cost shown
The financing cost of cash tied up in slow stock. If your cost of capital is 7% and you have EUR 600K in slow-moving inventory, that’s EUR 42K per year that doesn’t appear anywhere on the P&L.
Where to Get Your Numbers
| Metric | Where to find it | SAP Transaction |
|---|---|---|
| Average inventory | Opening + closing inventory balance / 2. If highly seasonal, use a 12-month average of monthly balances. | MB52 |
| COGS | Cost of goods sold from P&L for the same period. Do not use revenue or gross profit. | F.01 (P&L report) |
| Slow-moving % | Inventory aging report filtered by no movement in N days. Use best estimate if aging report unavailable and note it as an assumption. | MB52 with validity date filter |
Related Tools
See how inventory days feed into your total cash cycle cost.
Check whether categories with slow inventory are also your lowest margin lines.
Go Deeper
- Days Inventory Outstanding — DIO benchmarks by industry and realistic reduction targets
- Inventory Cash Trap — how slow inventory compounds and how companies typically discover it too late
- ABC Analysis — the segmentation framework to prioritize which SKUs to act on first