Find a calculator ↗Scrap and Rework Cost Calculator
Use this scrap and rework cost calculator to estimate manufacturing quality losses. Separate discarded units from successfully repaired units to calculate scrap loss, rework labor, and additional material cost.
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What are scrap and rework costs?
This scrap and rework cost calculator helps you estimate manufacturing quality losses.
Scrap is the loss on units that cannot be used or sold as intended, after any recovery value. Rework is the additional effort and material needed to bring repairable units to an acceptable condition. They affect profit differently and should not be treated as one undifferentiated defect count.
Separate the two groups
This model assumes reworked units are successfully repaired and are not also counted as scrap. If a repaired unit later fails, track its actual cost history separately rather than entering it in both groups without adjustment.
How to use the quality-cost calculator
Enter scrapped units, cost accumulated before rejection, and salvage value. For a separate rework group, enter units, extra repair minutes, loaded labor cost, and additional materials.
Use the right unit-cost basis
A part rejected early in production may not have incurred all costs of a finished unit. Use the cost reached at rejection, not automatically the final selling price or full finished-goods cost.
Step-by-step planning checklist
- Use production records from one defined period.
- Separate units finally scrapped from units successfully reworked, and record the cost incurred at the rejection stage.
- Measure extra repair effort rather than total production time.
- Compare the two cost categories before deciding whether prevention, process control, or repair improvements deserve attention.
Formula and worked example
One hundred scrapped units at $20 accumulated cost with $2 salvage create $1,800 loss. Two hundred reworked units taking ten extra minutes at $30 an hour use $1,000 of labor; $1 extra material per unit adds $200. Combined cost is $3,000 across 300 affected units.
Why original rework cost is not added
A successfully repaired unit still retains its original production value. This model counts the additional repair cost rather than treating the original unit as a total loss.
Use the breakdown to target improvements
Compare scrap loss with rework effort by process, product, or defect cause using the same costing method. A high rework workload can consume capacity even if fewer finished units are discarded.
What this model leaves out
The result is a direct quality-cost estimate, not the full cost of poor quality. Inspection, customer returns, warranty, expediting, and lost business are excluded. Improvement spending should be compared with costs that can actually be avoided, not automatically with every allocated dollar.
Further reading: ASQ cost-of-quality definitions. This calculator covers scrap and incremental rework, not every quality cost.
Frequently asked questions
Can the same unit appear in both groups?
Not in this simple model. Use separate scrap and successfully reworked populations to avoid double-counting.
If a repair attempt fails and the unit is scrapped, reconcile the repair expense separately with its final scrap cost. Do not count it as a successfully reworked unit here.
Should I use selling price as scrap cost?
No. Use the cost accumulated at rejection. Lost sales contribution is a separate effect.
A rejected part early in production may have less accumulated cost than a finished rejected product. Match the input to the actual rejection stage.
Why is salvage limited to unit cost?
This is a loss model. Recovery above accumulated cost requires a different accounting analysis.
Check whether the amount entered is a sale price, scrap recovery, or accounting adjustment. This calculator is designed for a nonnegative scrap-loss scenario.
What happens with no affected units?
Combined cost is zero; average cost per affected unit is undefined.
A cost per affected unit needs at least one affected unit as its denominator. Zero reported defects also does not establish that inspection and prevention cost nothing.
Does the result include customer warranty claims?
No. Warranty and downstream costs require separate inputs or analysis.
Keep customer returns, field service, and warranty replacements in a separate schedule. Add them only in a broader cost-of-quality analysis with no overlapping expenses.
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