Manufacturing Scrap Rate

It measures how much of what you make ends up in the scrap bin instead of shipping to customers.

Formal definition

Scrap rate equals scrapped parts or material weight divided by total parts or weight produced, expressed as a percentage.

Why it matters

Every scrapped part paid for material, labor, and machine time twice — rates above 2% often wipe out job margin.

Where you see it

• Shop floor KPI boards
• ISO quality management reviews
• Lean manufacturing training
• Customer quality scorecards
• Industrial engineering coursework

Worked example

1. Total parts produced: 10,000.
2. Scrap parts: 150.
3. Scrap rate = (150 ÷ 10,000) × 100 = 1.5%.
4. Interpretation: 1.5% of production was lost to scrap — within many shops' tolerance.

How Business metrics calculates it

Scrapped units ÷ Units produced × 100.

The range we use for status labels

On Business metrics, the status band for this KPI is roughly 0 to 2. Lower values are generally healthier in this band. Your niche can sit outside it honestly — the label is a prompt to read the coaching, not a certificate.

Where people fool themselves

Scrap that gets “reworked into seconds” and then sold still consumed capacity. If you only count landfill, the rate is a PR number.

Run it on your own numbers: the Manufacturing calculator.