Overhead Allocation Rate Calculator

Set rates fast with clear cost pools. See applied overhead and variances as enter data. Download reports, verify totals, and budget with confidence today.

Calculator inputs
Use estimated values for a predetermined rate, then apply it to jobs or compare to actual overhead.
Choose the activity that best drives overhead in your setting.
Used to compute over/under applied overhead.
Plantwide inputs
Used to calculate applied overhead: rate × job base.
Departmental inputs
Enter multiple cost pools. Add job base usage to compute applied overhead by department.
Department Est. overhead Est. base Job base (optional) Remove
Tip: If job bases are blank, the calculator still computes departmental rates, but it won’t compute applied overhead or variance.
Formula used

Predetermined overhead allocation rate is typically calculated using estimated period totals:

Rate = Estimated Total Overhead ÷ Estimated Total Allocation Base

For departmental costing, compute a rate for each cost pool:

Department Rate = Department Overhead ÷ Department Base

Applied overhead for a job equals Rate × Job Base Used. Over/under applied overhead equals Actual Overhead − Applied Overhead.

How to use this calculator
  1. Select an allocation method: plantwide or departmental.
  2. Pick the allocation base that best drives overhead in your operations.
  3. Enter estimated overhead and estimated base totals for the period.
  4. Optionally enter job base usage to compute applied overhead.
  5. Optionally enter actual overhead to see over/under applied variance.
  6. Click Calculate. Download CSV or PDF if needed.
Example data table
Scenario Estimated Overhead Estimated Base Computed Rate Job Base Used Applied Overhead
Plantwide 120,000.00 30,000.00 4.000000 250.00 1,000.00
Departmental (Total) 120,000.00 25,000.00 4.800000 — —
Example values are illustrative. Use your own estimates and activity drivers.
FAQs
1) What is an overhead allocation rate?
It is a rate used to assign indirect costs to products, services, or jobs using a chosen activity base like labor hours or machine hours.
2) When should I use plantwide vs departmental rates?
Plantwide works when overhead is driven by one main activity. Departmental rates are better when cost behavior differs across departments or processes.
3) What base should I choose?
Pick a base that best explains overhead usage. Machine hours often fit automated shops, while labor hours or labor cost may fit labor-intensive work.
4) What does over/under applied overhead mean?
Underapplied means actual overhead exceeded applied overhead. Overapplied means applied overhead exceeded actual overhead, often due to estimate differences.
5) Can I use this for budgeting?
Yes. Using estimated overhead and expected activity helps forecast product costs and compare results to actuals for control and planning decisions.
6) How accurate are the results?
Accuracy depends on your estimates and the relevance of the chosen base. Better drivers and updated assumptions reduce variance and improve costing quality.
7) Why export CSV or PDF?
Exports support reviews, audit trails, and sharing with teams. CSV works for spreadsheets, while PDF is useful for fixed-format documentation.

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Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.