How do you calculate rework cost?

Multiply the units routed to rework by the rework cost per unit by the share that passes after rework, then add the fixed setup and retest cost. For 5,000 units at $0.20 each with 90% recovery plus $200 fixed, that is 5,000 × 0.20 × 0.90 = $900 + $200 = $1,100.

Why does the calculator multiply by the recovery share?

It ties the variable spend to the units you actually save. At 90% recovery on 5,000 units you successfully rework 4,500, and the model costs that recovered volume. This makes rework comparable to scrap on a value-recovered basis.

When is rework cheaper than scrap?

Compare this total against the scrap cost for the same units. If reworking 5,000 units costs $1,100 and scrapping plus disposing of them would cost more, rework wins. The closer the recovery share is to 100% and the lower the per-unit rework cost, the more rework pays.

What is the rework cost per unit reworked in the example?

It is $0.22 — the $1,100 total divided by the 5,000 units routed to rework. Note it exceeds the $0.20 variable rate because the $200 fixed setup and retest cost is spread across the batch.

Is rework allowed under GMP for supplements?

Yes, but it must be a documented, justified, and often validated procedure with a release retest, which is exactly why the fixed setup and retest cost exists. Undocumented rework is a serious compliance finding, so always include that fixed cost.

What is a good recovery share for rework?

It depends on the defect: cosmetic or packaging defects often recover above 95%, while assay or contamination issues recover far less or are not reworkable at all. The 90% in the example is typical for screening or re-packing operations.

Nutraceuticals & Functional Foods calculator

Rework Cost Calculator

Rework cost is what you spend to recover supplement product that failed first-pass QC but can be salvaged — re-blending an off-spec powder, re-coating tablets, re-inspecting and re-packing sachets, or screening out defects so the rest of the lot can ship. Production and quality managers use it to decide whether reworking a batch is cheaper than scrapping it, and to keep COPQ honest, because rework consumes labor, line time, and a retest before release. In a GMP environment rework must be documented and validated, so it rarely costs zero. This calculator weights the variable cost by the share that actually passes after rework, so you are costing the recovery you really get, not the recovery you hoped for.

What this calculator does

Estimate the cost to rework a nonconforming lot from units to rework, rework cost per unit, and recovery rate, so teams can compare rework against scrap.
A production or quality team needs the cost of reworking a held lot, such as re-blending, re-labeling, or re-inspecting, to weigh it against scrapping.
It computes total rework cost as the variable per-unit rework cost weighted by the successful-recovery share, plus a fixed setup and retest cost.

Formula used

Variable rework cost = units to rework × rework cost per unit × share successfully reworked
Total rework cost = variable rework cost + fixed setup and retest cost

Inputs explained

Units routed to rework:
Rework labor and material cost per unit:
Share that passes QC after rework:
Fixed line setup and retest cost:

How to use the result

Use it when a batch fails first-pass QC and you are deciding between rework and scrap, or when budgeting recovery effort for a known defect mode.
It charges variable cost only against successfully reworked units; in reality you spend labor on failed attempts too, so for low recovery yields the model can understate true cost.

Current U.S. benchmarks

Industrial natural gas averages $4.9 per Mcf (EIA, Apr 2026), down 7.7% from a year earlier, with industrial electricity at 8.66 cents per kWh. Process heating and refrigeration budgets track both.
The U.S. has 31,130 food manufacturing establishments employing about 1,707,316 workers (Census County Business Patterns, 2023).

Common questions

How do you calculate rework cost? Multiply the units routed to rework by the rework cost per unit by the share that passes after rework, then add the fixed setup and retest cost. For 5,000 units at $0.20 each with 90% recovery plus $200 fixed, that is 5,000 × 0.20 × 0.90 = $900 + $200 = $1,100.
Why does the calculator multiply by the recovery share? It ties the variable spend to the units you actually save. At 90% recovery on 5,000 units you successfully rework 4,500, and the model costs that recovered volume. This makes rework comparable to scrap on a value-recovered basis.
When is rework cheaper than scrap? Compare this total against the scrap cost for the same units. If reworking 5,000 units costs $1,100 and scrapping plus disposing of them would cost more, rework wins. The closer the recovery share is to 100% and the lower the per-unit rework cost, the more rework pays.
What is the rework cost per unit reworked in the example? It is $0.22 — the $1,100 total divided by the 5,000 units routed to rework. Note it exceeds the $0.20 variable rate because the $200 fixed setup and retest cost is spread across the batch.
Is rework allowed under GMP for supplements? Yes, but it must be a documented, justified, and often validated procedure with a release retest, which is exactly why the fixed setup and retest cost exists. Undocumented rework is a serious compliance finding, so always include that fixed cost.

Last reviewed 2026-05-12.