Important Sewing Line Calculations

In Textile and Apparel industry, we use different types of calculations. In this article, we are going to learn some of the basic sewing line calculations. 

1. Efficiency = Output/Input 

                      = (SMV*Product Quantity) / (Worker*Working Hour*60)

                      = [(38.50*700) / (60*10*60)]*100

                      = 74% (Line Efficiency)

Here,
SMV=38.50
Working hour=10
No. of worker=60 

2. Target/hour = (60/SMV)*Efficiency%
                        = (60/0.85)*70%

                        = 50 pcs/hour (worker)

Here,
SMV=0.85
Efficiency=70%

3. Target/line = [(No of worker*working hour *60)/SMV]* Efficiency%
                       = [(75*10*60)/23.5]*60%

                       = 1150 pcs

Here,
No of workers=75
Working hours=10
SMV=23.5
Efficiency=60%

4. Required days for the schedule = Total order quantity / Average target
                                                      = 50000/2000

                                                       =25

Here,
Average target=2000
Order quantity=50000 

5. CM of garments= (Total Production)/(no of worker*work hour)

                               = 250000/(1500*10)

                               =1.66 BDT

Here,
Total Production=250000
No of workers= 1500

6. Factory capacity = [(Work hour*total workers*working day*60)/SMV]*Efficiency %
                                = [(10*1500*26*60)/14.13]*55%

                                = 8,28,025 pcs/month 

7. Others

•       Basic time = Observed time * Rating

•       Observed time = Total Cycle time / No of cycle

•       Rating = (Observed Rating * Standard rating) / Standard rating

•       Factory capacity = (Work hour / SMV) * Total worker * Working day * Efficiency

•       Required no of operator = Target daily output / Daily output per operator

•       SMV = Basic time + Allowances

•       Machine Hour Rate = Actual Factory overhead cost/Actual Machine working hour

•       Line Labor Productivity=(total no. of output per line per day)/ no of worker worked.

•       Line m/c productivity= (total no of output per line per day)/ no of machine used.

•       Capacity    = no. of m/c operators X working minutes x efficiency x  presents %

•        Load     = Contract Size X Work Content (Total SMV of the Garment)