Energy & Sustainability worked example

Scrap Carbon Impact with scrap material mass sent to waste or rework of 9,500 kg: a worked example

Push scrap material mass sent to waste or rework up to 9,500 kg and the picture changes. This example computes every intermediate figure at that operating point. a sustainability or quality engineer needs to quantify CO2e tied to scrap and rework material loss

The inputs for this scenario

  • Scrap material mass sent to waste or rework: 9,500 kg (raised for this scenario; the documented default is 3,800)
  • Cradle-to-gate embodied carbon factor of the material: 6.2 kg CO2e / kg (unchanged)
  • Yield loss or rework allocation factor: 1 x (unchanged)
  • Reporting boundary multiplier (gate vs full lifecycle): 1 x (unchanged)

Working through the calculation

  • Applying the documented formula (Base scrap carbon = scrap material quantity × embodied carbon factor × yield loss or rework allocation factor) to the inputs above produces each figure below.
  • At this operating point the engine returns 58,900 kg CO2e for reported scrap carbon impact, the number this scenario is built around.
  • At this operating point the engine returns 58,900 kg CO2e for base scrap embodied carbon.
  • At this operating point the engine returns 1 x for reporting boundary multiplier.
  • At this operating point the engine returns 58,900 kg CO2e for scrap material carbon before allocation.

How this compares with the baseline

  • Against the tool's baseline example, where scrap material mass sent to waste or rework sits at 3,800 kg and the headline result is 23,560 kg CO2e, this scenario comes in 150% above the baseline at 58,900 kg CO2e.
  • It computes the total embodied CO2e carried by scrapped or reworked material, scaled by an allocation factor and a reporting boundary multiplier. The value of this scenario is the size of the gap it exposes: that gap, priced out over a year, is the budget you can justify spending to close it.

Results at a glance

  • Reported scrap carbon impact: 58,900 kg CO2e (headline result)
  • Base scrap embodied carbon: 58,900 kg CO2e
  • Reporting boundary multiplier: 1 x
  • Scrap material carbon before allocation: 58,900 kg CO2e

Run it with your numbers

  • Every input above is editable in the live Scrap Carbon Impact calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.