What this tool estimates
It converts stock into two planning figures: the cash currently locked in sellable inventory at cost, and how many days of average sales that stock covers. Together they show not just how much money is on the shelf, but how quickly it can become cash again.
Inputs to verify
Count only sellable units you own. Value them at cost — the cash you paid — not at selling price. Use a sales rate measured over the same pool: per-SKU daily sales for a single SKU, or total daily cost of goods sold for a whole stock pool.
Reading the result
A large cash figure with a short day count is usually healthy stock; the same cash with a long day count is slow money that competes with your next purchase order for working capital.