Understanding how to calculate manufacturing overhead is fundamental for any business involved in production. This financial metric represents the indirect costs required to run your facility that cannot be directly traced to a single unit of product. Without a precise calculation, companies risk mispricing their goods, underestimating profitability, and making flawed strategic decisions regarding expansion or efficiency improvements.
The Components of Manufacturing Overhead
To calculate manufacturing overhead accurately, you must first identify the specific costs that fall into this category. These are expenses that support the production process but are not directly tied to the creation of a specific item. The category is broad and typically includes costs related to the maintenance of the facility and the machinery within it.
Fixed vs. Variable Overhead
Within the manufacturing overhead calculation, it is helpful to distinguish between fixed and variable costs. Fixed overhead remains constant regardless of production volume, such as rent or executive salaries for the plant. Variable overhead, conversely, fluctuates with output, including indirect materials like lubricants or indirect labor such as maintenance technicians who work more hours during high production periods.
Step-by-Step Calculation Process
The standard method to calculate manufacturing overhead involves aggregating all indirect costs and then applying a specific allocation method to determine the overhead rate. This process ensures that the true cost of production is captured, rather than just the direct materials and labor used on the assembly line.
1. Aggregate Overhead Costs
Begin by identifying and summing all indirect expenses for a specific accounting period. This includes items such as factory utilities, property taxes on the manufacturing building, depreciation on production equipment, and the salaries of factory supervisors. Be sure to exclude general corporate expenses or costs related to the sales department, as these do not belong in the manufacturing overhead pool.
2. Determine the Allocation Base
Next, select a metric to allocate these costs to your products, known as the cost driver or allocation base. The most common base is direct labor hours or machine hours. For example, if you are running automated machinery, you might use machine hours because the runtime correlates more closely with wear and tear than the number of workers on the floor.
Calculating the Overhead Rate
With the total costs and the allocation base determined, you can calculate the overhead rate. This rate is the dollar amount applied to each unit of the allocation base to assign overhead costs to specific jobs or products. This figure is critical for setting prices that cover all expenses.
Applying the Rate to Production
Once the rate is established, you apply it to the allocation base used by a specific product or department. If a product requires 10 machine hours to complete, you multiply 10 by the $20 hourly rate, assigning $200 of manufacturing overhead to that item. This ensures that the pricing strategy reflects the indirect burden of production.
