Plantwide Overhead Rate Calculator
This calculator helps you determine the plantwide overhead rate, a crucial metric for understanding the total cost of producing goods. The plantwide overhead rate is calculated by dividing the total plantwide manufacturing overhead costs by the total allocation base (e.g., direct labor hours, machine hours, or direct material costs).
Plantwide Overhead Rate:
Understanding the Plantwide Overhead Rate
The plantwide overhead rate is a single, company-wide rate used to allocate indirect manufacturing costs (overhead) to products. These indirect costs include items like factory rent, utilities, depreciation of machinery, salaries of supervisory staff, and indirect labor. By calculating this rate, businesses can gain a better understanding of the true cost of their products, which is essential for pricing decisions, profitability analysis, and cost control.
How to Calculate:
The formula is straightforward:
Plantwide Overhead Rate = Total Plantwide Manufacturing Overhead Costs / Total Allocation Base
The Allocation Base is a measure of activity that is believed to drive overhead costs. Common allocation bases include:
- Direct Labor Hours: Assumes overhead is driven by the amount of labor time spent on production.
- Machine Hours: Assumes overhead is driven by the usage of machinery.
- Direct Material Costs: Assumes overhead is related to the cost of raw materials used.
Choosing the most appropriate allocation base is critical for accurate cost allocation. A rate that is too high may lead to over-costing products and uncompetitive pricing, while a rate that is too low may lead to under-costing and potentially unprofitable sales.
Example:
Let's say a factory has total plantwide manufacturing overhead costs of $500,000 for the year. The total direct labor hours used in production for the same period were 25,000 hours. Using direct labor hours as the allocation base:
Plantwide Overhead Rate = $500,000 / 25,000 direct labor hours = $20 per direct labor hour.
This means that for every direct labor hour worked, the company will allocate $20 of manufacturing overhead to the product being produced.