Inventory Holding Cost Calculator

Four buckets: storage (warehouse rent or 3PL fees, often 6–10% of value per year), cost of capital (what the cash could earn or what your credit line charges, 6–12%), risk (shrinkage, damage, obsolescence, 3–8%), and service costs (insurance, taxes, handling, 2–5%). Summed, most merchants land between 20% and 30% — higher for bulky, fragile, or fast-expiring goods.

Add up a year of actual costs: total storage invoices, interest on inventory financing (or a 8–10% opportunity rate on cash), last year’s shrinkage and write-offs, and the inventory share of your insurance. Divide by your average inventory value at cost. Most merchants who do this exercise once are surprised — the real number is rarely below 20%.

Decisively. A 10% price break for ordering a year of stock instead of a quarter looks free until you charge holding cost: the extra nine months of inventory at a 25% annual rate costs roughly 9–12% of its value — the entire discount, before adding the risk that the product stops selling. Model the discount against the added months of holding before saying yes.

Attack the biggest lever first: quantity. Reorder smaller amounts more often on your fast movers, clear dead stock (it pays rent and never leaves), and negotiate storage — 3PL rates are more flexible than most merchants assume, especially off-peak. Cutting average inventory 20% at a 25% rate on $50k of stock saves $2,500 a year with zero change in service level if the cut comes from the slow tail.