M3 Standard Cost Rollup Calculator
Before anyone argues about a cost variance, someone has to be able to reproduce the standard. This calculator builds a single-level unit cost from material, scrap, setup, run and overhead, and shows how strongly lot size drives it.
Your numbers
Your results
Single-level illustration. Multi-level costing sums component costs from the bottom of the structure and may apply different overhead bases.
Unit cost and setup cost per piece vs lot size
Sweeps Costing lot size from 1 to 500, holding your other inputs fixed.
Trace cost variances
Optional: have standard vs actual cost variances analysed for your M3 items.
Optional. The tool and every export work without this. No spam.
How to use it
Enter the costing lot size and the material cost per piece, then the scrap allowance, setup and run times, labor and machine rates and the overhead percentage you apply to conversion cost. The calculator gives each cost component per piece and the total lot cost. Move the lot size slider to see the setup cost per piece fall as the lot grows, and compare the rollup against what your costing run produces for the same item.
- Use the same lot size as your costing setup
- Rates should match those in the cost centre master data
- Add outside processing separately if applicable
- Compare to the system result before trusting either
The calculation
Material including scrap is material cost times (1 plus scrap percent). Setup per piece is setup hours times combined labor and machine rate divided by the lot size. Run cost per piece is run minutes divided by 60 times the combined rate. Overhead is applied as a percentage on setup plus run conversion cost. The standard unit cost is the sum of all four, and lot cost is the unit cost times the lot size.
Reading the lot size effect
Setup cost per piece falls in proportion to one over the lot size, so the steepest savings occur at small lots. Beyond a certain quantity, extra volume barely moves the unit cost. If your costing lot is unrealistic compared with actual production lots, the standard will understate real cost and create unfavourable variances every period.
- Costing lot far above actual lot means chronic variances
- Check overhead basis matches the cost accounting policy
- Update rates when machine or labor costs change
Common mistakes
Dropping scrap from the rollup is the most common error. Applying overhead to material when policy applies it to conversion only is a close second. Teams also forget that rate changes ripple through every item using the work centre, so a small rate edit can move hundreds of standards at once. Always preview impact before committing a new costing run.
Frequently Asked Questions
Why does my system cost differ from this result?
Differences usually come from rate sources, rounding, overhead bases, multi-level components or a different costing lot. Compare each component line by line to find which assumption differs.
Should scrap be on material only?
It depends on policy. Many companies apply scrap to material, and some also inflate run time. This tool applies it to material only, so adjust the run time yourself if your policy differs.
What is a sensible overhead rate?
It is set by your cost accounting, usually as total indirect cost divided by the chosen base, such as direct labor or machine hours. Take it from finance rather than estimating.
Can I use this for quoting?
As a first pass, yes. A quote also needs margin, tooling, packaging, freight and risk, so treat the unit cost as a floor rather than a price.
If you need variances between standard and actual cost traced item by item in M3, Netray can build a read-only analysis on your data.
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