The efficiency of a production line or an individual operator is calculated by using following formula.
Efficiency (%) = (Total minutes produced / Total minutes attended at work)*100
What is Overall Efficiency
The above formula gives us the overall efficiency of an operator or a line. In the above example, all working hours are considered in the calculating efficiency. In the total shift hours, sometimes operators will work a standard job, sometimes they will work on off-standard jobs and sometimes they may not be doing any job due to lost time (no work). When the total work time is not separated and whole hours are used in the calculation, it gives overall efficiency.
Read how to calculate the overall efficiency of a production line.
What is On-Standard Efficiency?
In a shift, operators attend 480 minutes (8 hours shift), but they may not always sewing garments. Sometimes operators wait for work due to external reasons or they do off-standard jobs (operations) in the 480 minutes duration. Reasons are like waiting for work, machine break-down, power failure, line setting, meeting, non-availability of trims and accessories. All these off-standards reduce operator’s real performance (efficiency level).
The On-standard efficiency calculation formula
On-standard Efficiency (%) = Total minutes produced / Total minutes attended for on-standard jobs*100
See the example On-standard efficiency calculation method.
Difference between On-Standard Efficiency and Overall Efficiency
The On-standard efficiency of a line/operator will be higher than or equal to the Overall Efficiency. If the employee works on the standard job for the whole day, the On-standard efficiency and Overall Efficiency value will be equal.
In case, an operator does an off-standard job (spent sometimes in the off-standard job), the On-standard efficiency will be higher than the overall efficiency.
Calculating the overall efficiency (for a line or an operator) is easier compared to calculating the On-standard efficiency, as to calculate On-standard efficiency, you need to measure time spent on the standard job.
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