Enter the total number of rejections and the total number of units into the calculator to determine the rejection percentage. This calculator can also evaluate either the number of rejects or total units when provided the other variables.

Rejection Percentage Formula

The following formula is used to calculate a rejection percentage. 

R = TR / TU * 100
  • Where R is the rejection percentage
  • TR is the total number of rejects
  • TU is the total number of units

To calculate rejection percentage, divide the total number of rejects by the number of units in the lot, then multiply by 100.

What is a rejection percentage?

Definition:

A rejection percentage is a measure of the rate at which products are rejected on average. This rate is expressed as a ratio of rejects to sample size.

How to calculate rejection percentage?

Example Problem:

The following example problem outlines the steps and information required to calculate a rejection percentage.

First, determine the number of units in the sample size. In this example, we are looking at a sample of 4000 parts.

Next, determine the total number of rejects in the sample. In this case, there are 100 rejects.

Finally, calculate the rejection percentage using the formula above:

R% = TR / TU * 100

R% = 100/4000 * 100

R% = 2.5 %