The total cost of inventory formula is: total inventory cost = buy cost + ordering cost + holding cost + shortage cost. Reviewed November 2026. The sum shows what stock really costs, not just what you paid the supplier. Some sources use a shorter version with no shortage cost.
Every dollar figure below is illustrative.
Book a callA pallet costs more than its price tag. You store it, move it, insure it and count it. Each task adds cost. On slow items, those costs eat the margin. Wholesale and distribution margins are thin, so a few points matter. The US Census Bureau tracks wholesale inventories and sales every month. Stock is a large part of what a wholesaler owns.
Counts matter by law too. IRS Publication 538 says: "To figure taxable income, you must value your inventory at the beginning and end of each tax year." Scan-based counts rely on the barcode standards from GS1. The invoice shows the first cost of stock, and the other 3 costs decide your profit.
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Book a callTotal inventory cost has 4 parts: what you buy, what you spend to order it, what you spend to keep it, and what you lose when it runs out.
Add the 4 lines and you have the full bill for your stock.
Buy cost is unit cost x quantity bought. Add freight in and duties to the unit cost. Subtract discounts that lower it. If you keep supplier bills in your accounting software, export them for this number. Bills hold the real price paid, so they beat a price list. Use the landed cost, which is the price plus all the fees to get the item to your dock.
Ordering cost is the price of placing one order. It covers staff time, shipping fees, receiving and paperwork. The formula is cost per order x number of orders. Say each order costs $50 and you place 12 a year. That is $600. Many small orders raise this cost fast. Fewer, larger orders cut it, but they raise the next cost.
Holding cost, also called inventory carrying cost, is what it costs to keep stock on the shelf. It covers space, utilities, insurance, handling, damage, theft, spoilage and the money tied up in goods. The formula is average inventory value x holding cost rate. Average inventory value is start value plus end value, divided by 2. Owners state the rate as a percent of stock value per year. Many start near 20% and adjust after they add up real costs.
Shortage cost is what an empty shelf costs you. It includes lost sales, rush shipping, unhappy customers and idle staff. Nobody can measure it exactly, so use a reasonable estimate and say it is an estimate. Shortage cost fights holding cost. Stock more and shortages fall, but holding cost climbs. Stock less and the reverse happens.
Seven steps give you the number. Start with one product line, not the whole warehouse.
Now the example. A small distributor buys 1,000 units at $10. It places 12 orders at $50 each. Average inventory is $2,500 at a 20% holding rate. The shortage estimate is $300.
$10,000 + $600 + $500 + $300 = $11,400
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Book a callDivide total cost by units to get your true cost per unit. In the example, $11,400 divided by 1,000 is $11.40. The invoice said $10. Use the higher figure to set prices, spot slow movers and pick what to reorder. Run it each period. A rising number tells you costs are creeping up.
Cost of goods sold, or COGS, covers only the items you sold. Total inventory cost covers buying, ordering, holding and shortages. Accounting reports alone do not show holding or shortage costs. Read more on how to calculate cost of goods sold without ending inventory and on costing inventory when you need the accounting side.
Economic order quantity, or EOQ, is the order size where ordering and holding costs balance. The formula is the square root of (2 x annual demand x ordering cost per order / holding cost per unit).
Take the example. Demand is 1,000 units. Each order costs $50. Holding cost per unit is $2, which is $10 x 20%. So 2 x 1,000 x 50 / 2 is 50,000. The square root is about 224 units per order. That is about 4 to 5 orders a year, not 12. EOQ assumes steady demand. Spiky demand needs a second look.
Off-the-shelf means fitting your process to the software. We do it the other way round, and the first look costs nothing.
Book a callFour mistakes skew the number:
Four moves bring the cost down:
Better inputs lead to better choices on all 4 moves.
You need 5 kinds of data, and today they sit in several places.
Manual copying between these places causes errors and stale numbers. The formula is easy. Getting reliable inputs is the real work. A business outgrows spreadsheets when the copying steps make counts wrong or reports late.
Run the formula before you shop for any tool. Compare the yearly cost of errors, excess stock and stockouts with the cost of inventory management software. Assume 2 people spend 5 hours a week copying data at $20 an hour. That is $10,400 a year. The Bureau of Labor Statistics lists real pay for stock clerks. NIST offers neutral guidance on supply chain process. Your own numbers should decide how much to spend on inventory management software costs.
A small team does not need a long, costly rollout. Software can be built around how the operation already works. Keep your accounting software where it helps, such as bills and payments. Replace only the manual parts, like retyping counts from paper.
Rates vary by firm. Many owners start near 20% of stock value a year. Then they adjust after adding up real space, insurance and handling costs.
Run the formula every quarter for top product lines. Run it monthly if stock moves fast. Compare each period to spot rising costs.
Yes, for buy and ordering costs. Holding and shortage costs need extra inputs, such as space costs and lost-sale notes. Those inputs are the hard part.
The point comes when manual copying causes wrong counts or late numbers. At that stage, replace the manual steps, not the whole system.
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