Injection Molding calculator

Regrind Percentage Calculator

Calculate regrind percentage from regrind weight and total resin blend weight. Two counts and a target give you a rate plus how far you are from where you need to be.

What this calculator does

  • Calculate regrind percentage from regrind weight and total resin blend weight.
  • Use it when regrind percentage in injection molding needs a clean rate and gap-to-target you can put on a tier board.
  • Turns regrind percentage count, total regrind percentage population, target regrind percentage rate into a rate for regrind percentage in injection molding.

Formula used

  • Regrind percentage rate = regrind percentage count ÷ total regrind percentage population × 100
  • Regrind percentage gap to target = regrind percentage rate - target regrind percentage rate

Inputs explained

  • Regrind percentage count: Enter the number of defects, passes, claims, shortages, conforming units, or events being measured.
  • Total regrind percentage population: Use the matching inspected, produced, tested, shipped, sampled, or installed population for the same period.
  • Target regrind percentage rate: Enter the KPI, specification, contract target, quality target, or internal control limit.

How to use the result

  • Use it when regrind percentage in injection molding is being reviewed against a KPI.
  • Trend matters more than a single snapshot; pull the result for the last several periods before you act.

Common questions

  • Why use this regrind percentage tool for injection molding? Calculate regrind percentage from regrind weight and total resin blend weight. You get a rate you can defend before quoting, scheduling, or sign-off.
  • What numbers should I focus on first? regrind percentage count, total regrind percentage population, target regrind percentage rate usually move the rate most. Pull from measured injection molding runs, supplier data, and recent quotes rather than memory.
  • What do I do with this number? Use the gap to target to prioritize the next injection molding kaizen or corrective action.
  • What should I double-check before acting? Confirm the counts came from the same time window and the same scope; mismatched scope is the most common error.

Last reviewed 2026-05-12.