Scrap rate in units or euros—which for management?
Euros for margin impact; units for ops root cause. Show both in the monthly ops review—PakProm uses euros in the CFO slide.
ZBI Business Control Library
Scrap Rate
Scrap Rate: plain-English definition, formula, worked example, how to interpret the result, peer-based benchmark guidance, common mistakes, and management actions in the ZBI Business Control Library.
What is Scrap Rate?
Scrap rate is scrapped quantity divided by total production quantity in the same period—material and labour you paid for that never became good product. It is not rework hours (that is a separate cost) and it is not yield at an intermediate stage unless you define scrap at that gate. At PakProm d.o.o., 420 scrapped units against 21,000 units produced in April is 2% scrap rate. I report scrap in euros alongside percent because a 2% rate on expensive laminate hurts margin more than 2% on a cheap liner—and because ops teams fix what they see in euro impact on the Monday review.
Why Scrap Rate matters
Scrap is immediate gross margin loss—material you bought and processed that goes to the dumpster or regrind bin. At 2% on 21,000 units, PakProm lost 420 good-unit equivalents of capacity and the resin, ink, and run time embedded in them. Customers feel scrap indirectly as lead time stretch when the schedule replans to replace lost output. Supervisors feel it when the same tool change drives scrap every Tuesday shift. Finance feels it in COGS variance before anyone updates standard cost. Scrap concentrated on one material lot is a supplier quality signal; scrap spread across shifts is a setup or training signal—same 2% headline, different fixes.
Formula and variables
Scrap Rate % = Scrap Quantity ÷ Total Production Quantity × 100
Scrap quantity — units scrapped at defined quality gates (not rework that eventually passes).
Total production quantity — total units processed including scrapped units in the same period.
Excel: =IFERROR(B2/B3*100,0)
Real business example
PakProm d.o.o. closes April on flexo Line 2: 420 units scrapped (web breaks, registration loss, and trim waste above standard); 21,000 total units through the line including scrapped. Scrap rate = 420 ÷ 21,000 × 100 = 2%. March was 1.4%—April's gap is 280 units from a new operator crew on night shift and 140 units from one resin lot with higher moisture content. Material cost of scrap EUR 6,800; plant manager sets 30-day target back to 1.5% with setup validation and supplier COA check on incoming resin.
How to interpret the result
Scrap rate tracks material loss at production—segment by line, shift, and root cause.
- 2% plant-wide can hide 4% on one line—publish by constraint operation.
- Scrap down after sorting is not success if sort cost and headcount rose—track cost of quality.
- Compare to standard scrap in product cost—variance hits margin before ops sees the trend.
- Lot traceability links scrap spikes to supplier batches within 48 hours.
Benchmark context
Flexible packaging converters often run 1–3% scrap on established SKUs; new product ramp gets a 90-day higher band with weekly review. Benchmark against your own best sustained quarter on the same mix, not a generic zero. Euro scrap cost matters for margin bridge—2% on high-value laminate exceeds 3% on liner board in P&L impact.
Red flags
- Scrap rate doubles after new operator or tool change—training and setup validation skipped.
- Scrap down but rework hours up 30%—quality problems hidden in yield, customer complaints still rise.
- Scrap concentrated on one material lot—supplier quality issue; without lot trace you scrap good parts too.
- Scrap rate acceptable in units but EUR cost up 30%—mix shifted to expensive alloy or laminate.
- Scrap 2% sustained while standard cost still assumes 1.2%—margin forecast overstated every month.
Common mistakes
- Counting rework that eventually passes as scrap—understates true first-pass loss.
- Scrap rate in units only when mix shifted to expensive materials—euro impact hidden.
- Averaging scrap across lines while one constraint drives customer late orders.
- Excluding startup scrap on new SKU—masks ramp cost that engineering should own.
- No lot trace when scrap doubles—supplier chargeback window closes while you blame operators.
What should management do next?
- Report scrap euros and rate by top five root-cause codes monthly.
- Hold joint quality review when scrap euros move more than 10% month-on-month.
- Track first-pass yield alongside scrap on constraint operations.
- Enforce supplier chargeback process when incoming lot drives scrap spike.
- Include scrap in gross margin bridge—procurement sees ops impact same week.
Related calculators
Related analyzers
Related templates & software
Related KPI pages
Related blog articles
FAQ
When does scrap trigger supplier chargeback?
When root cause is incoming material and lot is traceable—define threshold and timeline in supplier quality agreement.
Scrap down after sorting—is that success?
No if sort cost and headcount rose. Track cost of quality with scrap—first-pass yield tells the truth.
April scrap 2% after March 1.4%—do we stop the line?
Split by cause. One resin lot and one shift pattern suggest targeted fixes before line stop; plant-wide 2% with no cause needs deeper audit.
Scrap spike on new product—how long to grant learning curve?
Set 90-day ramp target with weekly review. Beyond target, hold engineering and ops joint corrective action.
Summary
Scrap rate measures production material lost to defects and waste. Track euros and percent by line and lot, tie to margin bridge, and fix root cause—not only the monthly percent.
Reviewed by ZBI Business Control Library · Last updated 2026-06-15