Quality & Metrology calculator

Rejection Rate Calculator

Estimate rejection rate for quality & metrology using production inputs, allowances, and safe planning assumptions. Two counts and a target give you a rate plus how far you are from where you need to be.

What this calculator does

  • Estimate rejection rate for quality & metrology using production inputs, allowances, and safe planning assumptions.
  • Use it when rejection rate in quality and metrology needs a clean rate and gap-to-target you can put on a tier board.
  • Turns rejection rate count, total rejection rate population, target rejection rate into a rate for rejection rate in quality and metrology.

Formula used

  • Rejection rate = rejection rate count ÷ total rejection rate population × 100
  • Rejection rate gap to target = rejection rate - target rejection rate

Inputs explained

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

How to use the result

  • Use it when rejection rate in quality and metrology 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

  • What does the rejection rate calculator give me? Estimate rejection rate for quality & metrology using production inputs, allowances, and safe planning assumptions. You get a rate you can defend before quoting, scheduling, or sign-off.
  • What numbers should I focus on first? rejection rate count, total rejection rate population, target rejection rate usually move the rate most. Pull from measured quality and metrology runs, supplier data, and recent quotes rather than memory.
  • How should I use the result? Use the gap to target to prioritize the next quality and metrology kaizen or corrective action.
  • What can throw the result off? 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.