Scrap & Waste Cost Calculator - what defects actually cost you.
Scrap cost = units scrapped x full per-unit cost (the materials, labor, and overhead already spent). Scrap is not just lost material, it is lost capacity. Enter your scrap rate and volumes to see the annual dollar cost.
Manufacturers track scrap rate but rarely calculate the full cost. Scrap is materials + labor already spent + overhead absorbed + the lost revenue from a unit that never sold. This calculator shows the real number, plus what's possible if you cut waste in half.
Production volume
Per-unit costs and price
SimpleGrid captures every rejection at the source - and posts the cost to the job that caused it.
Material issued, labor logged, rework applied - every event posts to the right job in real time. You see margin live, not after month-end. Six Sigma's first rule: you can't fix what you can't see.
Book a demoThe true cost of scrap and rework
Most manufacturers calculate scrap cost as scrapped units x material cost. That's about a third of the real number. Once a unit reaches scrap status, you've already spent: material + labor + machine time + overhead allocation + opportunity cost (the revenue it would have generated). And rework is worse - you spend extra labor to fix something that should have been right the first time.
The benchmarks
- Top decile (Six Sigma): under 1%
- Top quartile mid-market manufacturers: 1-2%
- Median: 3-5%
- Bottom quartile: 6%+
Source: IndustryWeek Best Plants benchmarking, ASQ data.
FAQ
Should rework labor count as full labor cost?
Rework labor is usually 0.5-1.5x the original labor cost. It's slower (operator is being careful) but it's also labor that produces zero new units. This tool asks for the rework labor cost separately.
What about defects we ship to the customer?
Those become warranty claims, returns, or customer complaints - much more expensive than internal scrap. The 1-10-100 rule from quality research: $1 to prevent a defect, $10 to catch it internally, $100 to fix it after it ships. The cost calculator here covers the $1-$10 zone. If you have significant external failures, you need a full Cost of Poor Quality assessment.
My scrap rate "feels" right but I can't measure it precisely. What's a reasonable estimate?
Most mid-market manufacturers underestimate scrap by 30-50%. If your gut says 3%, the real number is usually 4-5%. The first month of formal tracking almost always reveals more than expected. That awareness alone reduces scrap by 10-15% within a quarter (Hawthorne effect).