What is On-Standard Efficiency and Overall Efficiency?

When it comes for measuring production line efficiency, the efficiency is measured in various forms. Standard Efficiency, off-standard efficiency, Overall efficiency and True efficiency. In the post, I will explain the difference between On-standard efficiency and overall efficiency.

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). 

When operators are not working the standard jobs, they are simply not producing any garments or any minutes. That is why, to know the operator’s actual performance on the standard jobs, the operator’s efficiency is presented as On-standard efficiency. 

The formula for calculating on-standard efficiency is same but attended time. In case, of overall efficiency calculation total produced minutes is divided by total attended minutes at work. But for the On-Standard efficiency calculation, total produced minutes is divided by total attended minutes at standard jobs.

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.

Related: How to calculate operator efficiency at work?

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