Bioplastics & Biomaterials Processing worked example

Resin Price Variance at 110% variance allocation share: a worked example

Push variance allocation share up to 110% and the picture changes. This example computes every intermediate figure at that operating point. a materials buyer or estimator needs to quantify the impact of a bio-resin price increase, decrease, or supplier quote variance

The inputs for this scenario

  • Affected bio-resin weight: 18,000 kg or lb (unchanged)
  • Resin price variance: 0.32 $ / kg or lb (unchanged)
  • Variance allocation share: 110 % (raised for this scenario; the documented default is 100)
  • Fixed supplier or freight variance: 1,200 $ (unchanged)

Working through the calculation

  • Applying the documented formula (Allocated variable resin variance = affected bio-resin weight × resin price variance × variance allocation share) to the inputs above produces each figure below.
  • At this operating point the engine returns 7,536 $ for total resin price variance, the number this scenario is built around.
  • At this operating point the engine returns 0.42 $ / kg or lb for resin price variance per weight unit.
  • At this operating point the engine returns 6,336 $ for allocated variable resin variance.
  • At this operating point the engine returns 1,200 $ for fixed supplier or freight variance.

How this compares with the baseline

  • Against the tool's baseline example, where variance allocation share sits at 100% and the headline result is 6,960 $, this scenario comes in 8.28% above the baseline at 7,536 $.
  • It computes the total unfavorable or favorable resin price variance by multiplying affected weight by the per-unit price delta and allocation share, then adding any fixed supplier or freight variance. 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

  • Total resin price variance: 7,536 $ (headline result)
  • Resin price variance per weight unit: 0.42 $ / kg or lb
  • Allocated variable resin variance: 6,336 $
  • Fixed supplier or freight variance: 1,200 $

Run it with your numbers

  • Every input above is editable in the live Resin Price Variance calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.