Manufacturing COGS Formula

Manufacturing COGS takes two steps instead of one. First calculate Cost of Goods Manufactured (COGM): direct materials used + direct labor + manufacturing overhead, adjusted for the change in work-in-process (WIP) inventory. Then calculate COGS: beginning finished goods inventory + COGM − ending finished goods inventory. Retail businesses skip the first step entirely because they buy finished products rather than building them.

COGM is the total cost of everything the factory finished producing this period — it becomes an input, not the final answer. COGS is the cost of what actually sold this period. The two differ by the change in finished goods inventory: if you manufactured more than you sold, COGM is higher than COGS and the difference sits in inventory; if you sold from existing stock, COGS can exceed COGM for the period.

Yes — direct labor is one of the three core components of COGM, alongside direct materials and manufacturing overhead. This means wages for employees physically involved in production: assembly line workers and machine operators whose work can be traced to products. Production supervisors whose work cannot be traced directly to products belong in manufacturing overhead. Salaries for sales staff, accounting, and executive management are period expenses, not COGS, regardless of how the business is organized.

Manufacturing overhead is every production cost that isn't direct materials or direct labor: factory rent and utilities, depreciation on production equipment, indirect labor (maintenance staff, quality inspectors), factory supplies, and equipment repairs. It does not include office rent, sales commissions, marketing, or administrative salaries — those are operating expenses reported separately on the income statement.

Retail COGS is a single-step calculation: beginning inventory + purchases − ending inventory, because a retailer buys finished goods and resells them unchanged. Manufacturing COGS requires two steps and three inventory accounts (raw materials, WIP, and finished goods) because the business is converting materials and labor into a new product. See our general COGS guide for the retail version of the formula.

A COGM schedule is a stacked, cumulative statement that starts with direct materials used and adds each cost layer in order: beginning raw materials + purchases − ending raw materials = direct materials used; + direct labor + manufacturing overhead = total manufacturing cost; + beginning WIP − ending WIP = COGM. Each line adds to or subtracts from the running subtotal, and the final subtotal is cost of goods manufactured — which then feeds the COGS line, beginning finished goods + COGM − ending finished goods. The interactive schedule on this page builds exactly that statement from your own figures.

Within each block the order does not change the answer, as long as the components of that block are grouped correctly. Direct materials used must be resolved before it enters total manufacturing cost, WIP must be adjusted after total manufacturing cost to arrive at COGM, and finished goods must be adjusted after COGM to arrive at COGS. What does break the schedule is putting an item in the wrong block — for example treating office rent as manufacturing overhead, or using raw material purchases in place of direct materials used.

Work the formula backwards one step at a time. COGS = beginning finished goods + COGM − ending finished goods, so COGM = COGS − beginning finished goods + ending finished goods. Without ending finished goods or an explicit assumption about its balance, COGM cannot be determined uniquely. COGM equals COGS only if beginning and ending finished goods are equal; do not assume this silently. Then go one step further back: total manufacturing cost = COGM − beginning WIP + ending WIP, again reversing the WIP adjustment.

Yes. Indirect materials — glue, fasteners, cleaning supplies, machine lubricant, and any material that cannot be traced to a specific unit — are part of manufacturing overhead, not direct materials. The distinction matters because direct materials enter the schedule as direct materials used (beginning + purchases − ending), while indirect materials are folded into the overhead line. Indirect labor such as maintenance staff and quality inspectors goes into overhead the same way.

Only depreciation on production assets is grouped into COGS for a manufacturer. Depreciation on factory buildings, production machinery, and equipment used in making the product is part of manufacturing overhead, so it flows through COGM and then into COGS. Depreciation on office equipment, sales vehicles, or administrative buildings is an operating expense and is reported separately — it never enters the COGM schedule.