Inventory Cost (COGS) Calculator

Cost of Goods Sold (COGS) captures the direct costs tied to the products you actually sold during an accounting period, and getting it right is what makes a profitability figure trustworthy. It also anchors your pricing, which matters all the more as supply chains keep reshaping themselves through 2026. The tool here reduces a core financial metric to a number you can track period over period.

The accounting formula behind COGS is short but exacting: Beginning Inventory plus Purchases minus Ending Inventory. Beginning Inventory is the value of goods you had ready to sell when the period opened, and Purchases adds in the cost of all new inventory acquired along the way. Subtracting Ending Inventory, the value of whatever stayed unsold at the close, isolates the cost of what genuinely left the shelves.

Purchases is the line most often shortchanged, since costs like freight-in and the direct labor on manufactured goods belong there and are easy to overlook. Applying one consistent valuation method, whether FIFO, LIFO, or Weighted Average, across every period keeps your COGS comparable rather than distorted. With raw material costs swinging through 2026, accurate and timely physical counts have never carried more weight.