Defects per unit (DPU) is one of the simplest units to measure your defect rate.

• DPU = Total Defect / Total Number of Units
• Example:
  • Consider a bank form that has to be filled up.
  • There are 100 customers that have filled up this form
  • And out of the 100 forms that have been filled up, 2 defects (in this case errors) have been identified.
  • It may so happen that a few forms have more than 1 defect and a few forms do not have any defect.
  • So DPU = 2/100 = 0.02