DPO  Defects per opportunity
Calculation used in Six
Sigma and DFSS, (Design for Six
Sigma). The total number of possible errors or defects that
could be counted in a process or service. The
formula uses the number of defects and the
number of units times the DO,(defect
opportunities).
DPO 
= 
Number
of defects 

Number
of units x Number of opportunities 
One way to calculate PPM you would use one,
(1), as the number of opportunities and then use the DPMO,
(Defects per Million Opportunities), formula to calculate PPM. (see
the note on the DPMO page)
We have a free and commercial product to
aid you in these calculations. See our free
DPODPMO calculator and the commercial
DPODPMO calculator for more details.