# 12 Useful Formula for Industrial Engineers in Garment Manufacturing (Poster)

I love formulas for mathematical calculations. Because a formula helps me getting the result quicker and it specifically mentions what all data I need to collect to find the result of the desired thing. In this post, I have shared such 12 important garment production formula for engineers. In garment manufacturing, industrial engineers, production managers, and planners measure factory performance on a daily basis. Performances are measured using standard formulas. I guess you are already using such formulas for calculating performance.

Don't you think, it would be a good idea to have a poster of commonly used formulas in your workspace? A poster is a very useful tool for many reasons. I have made one poster for you and sharing it with you.

The following are the common formulas those are used by garment industry professionals.

Formula#1:
Daily Line Target = (Total working minutes in a day X No. of operators in a line X Line eff%)/Garment SAM
Read an example for calculating production target

Formula#2:
Individual operator target = (Total working minutes in a day X line efficiency %)/Operation SAM
Formula#3:
Individual operator Efficiency% = (units produced X operation SAM X 100)/Total minutes worked
When you develop the skill matrix for sewing operators you need to measure individual performance. Secondly, if you plan to start a performance-based incentive scheme for the individual operator, measuring individual operator efficiency is essential.

Formula#4:
Line Efficiency% = (Line output X garment SAM X 100)/(Number of operators X minute worked in a day)
Note: include helpers and workers doing manual operations in case you have included SAM of those operations.  See an example of line efficiency calculation.

Formula#5:
Machine Productivity: Line output / No. of machine used
Machine productivity is measured in production per machine per shift day. Here I have discussed more about machine productivity calculation with examples.

Formula#6:
Labor Productivity = Line output / No. of total manpower (operators +helpers)
Know more about labor productivity calculation method

Formula#7:
Line WIP (work in process) = Total pieces lie on the line for a particular order line
WIP of the line of an order is equal to Total pieces loaded till date minus Total piece out till date. The WIP calculation method and Excel report template are shown in this post.

Formula#8:
Standard Time = (Observed time X observed rating) + Allowances
Allowances – Relaxation allowance, contingency allowance

Formula#9:
Machine utilization% = (Actual Machine running Time X 100) / Time available

Formula#10:
Cost per minute = Total cost incurred in labor / Total available working minute in a day X no. of labors

Formula#11:
Production Cost per unit = Total cost incurred in production in a day/ no. of garment produced in a day

Formula#12:
Man to Machine ratio = Total manpower of the factory / Total no. of sewing machines (utilized)