How to calculate efficiency of a production batch or line?


Like individual operator efficiency, efficiency of a production line or batch or section is important for a factory. Daily line efficiency shows the line performance. To calculate efficiency of a line for a day, you will  need following data (information) from the line supervisor or line recorder.



1. Number of operators – how many operators worked in the line in a day
2. Working hours (Regular and overtime hours) – how many hours each of the operators worked or how many hours the line run in a day
3. Production in pieces – How many pieces are produced or total line output at the end of the day
4. Garment SAM – What is exact standard minute of the style (garment)

Once you have above data you have to calculate following using above information -
 a. Total minutes produced by the line: To get total produced minutes multiply production pieces by SAM
 b. Total minutes attended by the all operators in the line: Multiply number of operators by daily working hours and convert total hours into total minutes (multiplying by 60).

Now, calculate line efficiency using following formula:
Line efficiency (in percentage) = Total minutes produced by the line *100 /total minutes attended by all operators

For example, refer following table. Data calculation formula has been given on the header row of the table.

No. of
Operator
(A)
Working
hours
(B)
line output
(production)
(C)
Garment
SAM
(D)


Total
minutes
attended
(E=A*B*60)
Total Minute
 produced
(F=C*D)
Line
Efficiency (%)
(F/E*100)
48
8
160
44.25
23040
7080
30.73
48
11
240
44.25
31680
10620
33.52
34
8
300
25
16320
7500
45.96
35
11
400
25
23100
10000
43.29
35
11
329
25
23100
8225
35.61
34
8
230
25
16320
5750
35.23
34
8
200
35
16320
7000
42.89
35
11
311
35
23100
10885
47.12
34
11
340
35
22440
11900
53.03