Energy & Sustainability worked example

Scrap Carbon Impact with scrap material mass sent to waste or rework of 1,900 kg: a worked example

Suppose scrap material mass sent to waste or rework falls to 1,900 kg. This page works the full calculation at that level so you can see exactly which result moves and by how much. Estimate embodied carbon impact of scrap from scrap quantity, embodied carbon factor, yield adjustment, and allocation multiplier.

The inputs for this scenario

  • Scrap material mass sent to waste or rework: 1,900 kg (the input this scenario stresses; the baseline uses 3,800)
  • Cradle-to-gate embodied carbon factor of the material: 6.2 kg CO2e / kg (held at the documented default)
  • Yield loss or rework allocation factor: 1 x (held at the documented default)
  • Reporting boundary multiplier (gate vs full lifecycle): 1 x (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Base scrap carbon = scrap material quantity × embodied carbon factor × yield loss or rework allocation factor.
  • Reported scrap carbon impact works out to 11,780 kg CO2e at these inputs, and this is the headline figure for the scenario.
  • Base scrap embodied carbon works out to 11,780 kg CO2e at these inputs.
  • Reporting boundary multiplier works out to 1 x at these inputs.
  • Scrap material carbon before allocation works out to 11,780 kg CO2e at these inputs.

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 50% below the baseline at 11,780 kg CO2e.
  • It computes the total embodied CO2e carried by scrapped or reworked material, scaled by an allocation factor and a reporting boundary multiplier. When the numbers land here, the stressed input is the lever to work; the walkthrough above shows exactly how much each output recovers as it climbs back toward the baseline.

Results at a glance

  • Reported scrap carbon impact: 11,780 kg CO2e (headline result)
  • Base scrap embodied carbon: 11,780 kg CO2e
  • Reporting boundary multiplier: 1 x
  • Scrap material carbon before allocation: 11,780 kg CO2e

Run it with your numbers

  • To rerun this with your own numbers, open the live Scrap Carbon Impact calculator, set scrap material mass sent to waste or rework to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.