Coatings, Inks & Specialty Chemical Production calculator
Batch Rework Cost Calculator
Find the extra spending required to recover an off-specification batch. Enter corrective costs and the volume actually released after rework.
What this calculator does
- Total the additional material, labor, retesting and disposal cost of batch rework and express it per recovered saleable gallon.
Formula used
- Labor cost = rework person-hours × loaded hourly rate
- Rework cost = correction materials + labor + retesting + disposal
- Cost per recovered gallon = rework cost ÷ released volume
Inputs explained
- Recovered Saleable Volume: Released volume after the approved rework is complete.
- Correction Material Cost: Additional material issued only for this rework.
- Rework Labor Time: Total operator hours spent correcting the batch.
- Loaded Rework Labor Rate: Payroll cost per person-hour for rework operations.
- Retesting Cost: Additional laboratory and release testing charges.
- Rework Disposal Cost: Disposal charges attributable to the corrective work.
How to use the result
- Best suited to reviewing off-specification batch losses, comparing corrective processing plans.
- Excludes original production cost, equipment downtime and lost sales. The calculation does not determine whether rework is technically permissible.
Current U.S. benchmarks
- Industrial electricity averages 9.77 cents per kWh across the U.S. (EIA, Jul 2026), up 4.7% from a year earlier. Energy-intensive steps carry this directly into unit cost.
- The producer price index for industrial chemicals stands at 336.006 (BLS, Aug 2026), up 13.3% from a year earlier. Quotes priced off last quarter's material cost miss this move.
- The U.S. has 14,543 chemical manufacturing establishments employing about 911,245 workers (Census County Business Patterns, 2023).
Common questions
- Should I include the original batch cost? No. This model isolates additional corrective spending. Add the original cost separately when evaluating total batch profitability.
- Which volume belongs in the denominator? Use saleable volume released after rework. Material sent for correction can include residues or rejected product that never returns to saleable inventory.
- Does cheaper rework mean I should release the batch? No. Release depends on your approved specifications and quality process. This tool evaluates cost only.
- Where does lost production time belong? Analyze lost capacity separately unless it creates a documented additional cash cost. This model includes only the four listed corrective cost categories.
Related guides
Last reviewed 2026-10-01.