Manufacturing Overhead Rate Calculator
Allocate manufacturing overhead by direct labor or machine hours and find the overhead cost applied to each unit.
Overhead Rate = Total Manufacturing Overhead ÷ Direct labor hours
Overhead Applied per Unit = Overhead Rate × Hours per Unit
Overhead Rate
$12.00
per direct labor hour
Overhead Applied per Unit
$30.00
per unit
At 2000 units, total overhead applied to production is $60,000.00.
The formula
A manufacturing overhead rate spreads indirect production costs across an allocation base — usually direct labor hours for labor-intensive shops, or machine hours for automated ones:
Overhead Rate = Total Manufacturing Overhead ÷ Allocation Base (labor or machine hours)
Once you have a rate, multiply it by the hours a single unit requires to find overhead applied per unit:
Overhead Applied per Unit = Overhead Rate × Hours per Unit
Worked example: allocating overhead by direct labor hours
A small manufacturer budgets $60,000 in manufacturing overhead this year — factory rent, utilities, equipment depreciation, and a floor supervisor's salary. They estimate 5,000 direct labor hours available over the same period.
Overhead Rate = $60,000 ÷ 5,000 hours = $12 per direct labor hour
Their flagship product requires 2.5 direct labor hours to build:
Overhead Applied per Unit = $12 × 2.5 hours = $30 per unit
At 5,000 available labor hours ÷ 2.5 hours per unit, they can produce about 2,000 units — and $30 × 2,000 units = $60,000 of total overhead applied, matching the original budget exactly when actual hours match the estimate.
Why product costing without overhead understates true cost
A product cost built only from direct materials and direct labor looks cheaper than it really is — it ignores the factory rent, depreciation, and supervision that made production possible. Adding the $30 per-unit overhead figure above to direct materials and direct labor gives a full manufacturing cost, which is what quotes, margin calculations, and pricing decisions should actually be based on.
Related calculations
Overhead is one of three inputs to Cost of Goods Manufactured, alongside direct materials and direct labor. See the full definition of COGS in the glossary, or read Cost of Goods Sold (COGS) Explained and Bill of Materials (BOM) Explained for how overhead feeds into per-product costing.
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Frequently asked questions
What is a manufacturing overhead rate?
A manufacturing overhead rate spreads indirect production costs — factory rent, utilities, equipment depreciation, supervisor pay — across the units a manufacturer produces. Because overhead can't be traced to a specific unit the way direct materials or direct labor can, it is applied using a rate per allocation base, most commonly direct labor hours or machine hours.
Should I use direct labor hours or machine hours as the allocation base?
Use direct labor hours when production is labor-intensive — workers doing most of the value-added work by hand. Use machine hours when production is capital-intensive — automated equipment running most of the process with labor mainly supervising. Picking the base that actually drives your overhead costs (more machine time usually means more depreciation and utilities) keeps the resulting product costs realistic.
What costs belong in "total manufacturing overhead"?
Total manufacturing overhead includes all indirect production costs for the period: factory rent and utilities, equipment depreciation and maintenance, indirect labor like supervisors and QC staff, and factory supplies. It excludes direct materials, direct labor, and any selling, general, or administrative (SG&A) expense — those never belong in a manufacturing overhead pool.
Why does overhead rate matter for product costing?
Without an overhead rate, a per-unit product cost only reflects direct materials and direct labor — understating true cost and making margins look better than they are. Applying overhead per unit, even at an estimated rate, brings quoted prices and margin calculations in line with what a unit actually costs to produce, including the factory costs that aren't tied to any single order.
Let Nstock roll overhead into product cost automatically
Nstock applies overhead to your BOM-based product costs automatically, so every quote and margin report reflects full manufacturing cost instead of just materials and labor.