Methodology, examples, and practical guidance
Job Cost Calculator: Labor, Materials & Overhead
A job can look profitable until payroll burden and overhead are included. Start with the resources required to complete one job, then allocate a share of indirect expenses. The result is an internal cost estimate, not a customer selling price.
THE METHOD
The formula
Use the following method with your own business figures.
This tool applies overhead to all direct costs. If your business allocates overhead using labor hours or another basis, calculate that allocation separately.
PUT IT TO WORK
A worked example
These figures illustrate the calculation, not a recommended business target.
- 40 labor hours × $28 per hour = $1,120.
- $1,120 + $850 materials + $400 subcontractors = $2,370 direct cost.
- $2,370 × 20% = $474 allocated overhead.
Total estimated job cost is $2,844 before profit.
USE THE RESULT
How to interpret the number
Put the result in context
Compare the estimate with actual job costs after completion. Repeated differences can reveal missing materials, rework, or underestimated labor hours.
CHECK YOUR ASSUMPTIONS
Common mistakes
Check the inputs and assumptions
Do not use the customer's billing rate as the labor cost. Include wages and relevant payroll burden, and avoid allocating overhead twice.
Questions business owners ask
Use these answers to refine the assumptions behind the calculator—not as a substitute for advice specific to your business.
Does job cost include profit?
No. This calculator totals delivery costs and allocated overhead. Add a pricing margin separately when preparing your quote.
Planning note: Use this educational estimate alongside your records and qualified professional advice for significant business decisions.