Sustainable Packaging & EPR Compliance worked example

Lightweighting Savings at 65% share of theoretical savings actually realized: a worked example

Here is what the math looks like when conditions slip. We hold every other input steady and drop share of theoretical savings actually realized to 65%, then walk the calculation through step by step. Estimate net savings from packaging lightweighting after subtracting redesign and qualification costs.

The inputs for this scenario

  • Packaging material removed across the run: 8,000 kg (held at the documented default)
  • Delivered material cost avoided: 2.1 $/kg (held at the documented default)
  • Share of theoretical savings actually realized: 65 % (the input this scenario stresses; the baseline uses 90)
  • Redesign and requalification cost (enter as negative): -3,500 $ (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Net savings = weight removed x cost per kg x realized% + redesign cost.
  • Total lightweighting savings cost works out to 10,920 $ at these inputs, and this is the headline figure for the scenario.
  • Lightweighting savings cost per unit works out to 1.37 $ / piece at these inputs.
  • Variable lightweighting savings cost works out to 10,920 $ at these inputs.
  • Fixed lightweighting savings adder works out to 0 $ at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where share of theoretical savings actually realized sits at 90% and the headline result is 15,120 $, this scenario comes in 27.78% below the baseline at 10,920 $.
  • The practical read: the gap between this scenario and the baseline is entirely attributable to share of theoretical savings actually realized, so recovering it is worth quantifying in dollars before considering equipment or staffing changes. It captures direct material and redesign cost only; it does not price knock-on effects like higher damage rates, faster line speeds or changed transport cube, which can swing the real economics either way.

Results at a glance

  • Total lightweighting savings cost: 10,920 $ (headline result)
  • Lightweighting savings cost per unit: 1.37 $ / piece
  • Variable lightweighting savings cost: 10,920 $
  • Fixed lightweighting savings adder: 0 $

Run it with your numbers

  • To rerun this with your own numbers, open the live Lightweighting Savings calculator, set share of theoretical savings actually realized to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.