How do you calculate scrap or reblend cost per batch?

Multiply off-spec mass by the reblend cost rate and the recovered-material share, then add fixed disposal and rework labor. With 180 kg at $2.20/kg, 70% recovery, plus $120 labor, the total is $397.20 per batch.

What does the per-kg off-spec cost tell me?

It normalizes the batch cost by mass so you can compare deviations of different sizes. In the example, $397.20 over 180 kg is about $2.21 per kg of off-spec material, which you can benchmark against your product's selling price.

Is it cheaper to reblend or to scrap a batch?

Reblend when the recovered-material share is high and the rework rate is well below your raw-material and finished-goods value; scrap when recovery is low or rework labor and utilities exceed the value you would recover.

Why include disposal and rework labor as a fixed amount?

Cleanout, lab retest, operator time, and waste-hauling fees are largely the same whether the batch is 150 kg or 200 kg, so they are added as a flat $120 rather than scaled by mass.

What is a good scrap/reblend cost target?

There is no universal figure, but world-class blending operations keep total cost-of-poor-quality under roughly 1-2% of production value. Track per-kg cost over time and per-batch trends to flag a process drifting toward more failures.

How does recovered material share affect the result?

It scales the variable reblend cost, so at 70% you effectively pay to reprocess only the salvageable fraction. The captured (variable) portion here is $277.20; the remaining $120 is fixed labor that recovery does not change.

Mixing, Blending & Industrial Batch Processing calculator

Scrap/Reblend Cost Calculator

Scrap/Reblend Cost puts a dollar figure on what it actually costs when a mix goes out of spec and has to be reworked, recovered, or thrown away. Batch process engineers and quality managers in food, coatings, polymer compounding, and chemical blending use it to decide whether a failing batch is worth saving or cheaper to dispose. The number drives cost-of-poor-quality reporting and helps justify spend on better dosing, sampling, and in-line analytics. Knowing the per-kg burden also tells you whether a recurring deviation is a nuisance or a budget line that needs a CAPEX fix.

What this calculator does

Estimate scrap and reblend cost from off-spec mass, reblend cost rate, recovered material share, and fixed disposal and rework labor.
Use it when an off-spec batch needs a rework or disposal call and you need to compare reblend cost against scrap and rerun cost before deciding.
It computes the total cost of handling an off-spec batch as reblend mass times rate adjusted for recovered share, plus fixed disposal and rework labor, and divides by batch mass for a per-kg figure.

Formula used

Scrap or reblend cost = off-spec mass × reblend cost rate × recovered material share + disposal and rework labor
Cost per kg off-spec = scrap or reblend cost ÷ off-spec batch mass

Inputs explained

Off-spec batch mass:
Reblend cost rate:
Recovered material share:
Disposal and rework labor:

How to use the result

Use it each time a batch fails a spec check and you need to compare reblend-and-recover against scrap-and-dispose, or to total annual cost-of-quality from recurring deviations.
It treats the recovered-material share as a simple discount on reblend cost and does not model downstream yield loss, lab retest cost, or value lost if reblended product is downgraded to a lower-margin grade.

Common questions

How do you calculate scrap or reblend cost per batch? Multiply off-spec mass by the reblend cost rate and the recovered-material share, then add fixed disposal and rework labor. With 180 kg at $2.20/kg, 70% recovery, plus $120 labor, the total is $397.20 per batch.
What does the per-kg off-spec cost tell me? It normalizes the batch cost by mass so you can compare deviations of different sizes. In the example, $397.20 over 180 kg is about $2.21 per kg of off-spec material, which you can benchmark against your product's selling price.
Is it cheaper to reblend or to scrap a batch? Reblend when the recovered-material share is high and the rework rate is well below your raw-material and finished-goods value; scrap when recovery is low or rework labor and utilities exceed the value you would recover.
Why include disposal and rework labor as a fixed amount? Cleanout, lab retest, operator time, and waste-hauling fees are largely the same whether the batch is 150 kg or 200 kg, so they are added as a flat $120 rather than scaled by mass.
What is a good scrap/reblend cost target? There is no universal figure, but world-class blending operations keep total cost-of-poor-quality under roughly 1-2% of production value. Track per-kg cost over time and per-batch trends to flag a process drifting toward more failures.

Last reviewed 2026-05-12.