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.
Now, calculate line efficiency using following formula:
Line efficiency = Total minutes produced by the line/total minutes attended by all
operators