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Calculating Capacity

Capacity Planning and Calculation play a very important role in whole MRP-II cycle. Here is the example to calculate capacity as per availab... thumbnail 1 summary
Capacity Planning and Calculation play a very important role in whole MRP-II cycle. Here is the example to calculate capacity as per available machines, labors and hours.

An Example
•Simple, near perfect world
1 machine, no labor or material constraints
•Annual demand 1.2 million units
•Rated equipment capacity :
300 units per hour

Assumptions

Enough capacity?

How much annual capacity ?

DAYS
  365
 -100  weekends
  265
   -15  holidays
  250 “regular” days


HOURS
     8         gross time / shift
    -1         breaks
     7         productive time
   x3         # shifts
   21         net hours / day

250 days/year x  21 hours/day = 5250 hours/year
5250 hours/year X 300 units per hour = 1.575 mm
Capacity utilization = 1.2 / 1.575 mm = 76%