Industrial engineering formula

Line efficiency formula

Earned minutes (good output × SMV) as a percentage of available minutes (manpower × working minutes).

Formula

\eta = \dfrac{P \times \text{SMV}}{M \times T} \times 100

Symbol	Meaning	Unit
P	Good output	pcs
SMV	Garment SMV	min
M	Manpower counted in the line	persons
T	Working minutes per person	min

When to use it

Use it daily and hourly to track sewing line performance against plan, and to compare lines working on different styles.

Worked example#

A line of 40 people works 480 minutes and produces 1,000 good T-shirts with an SMV of 12.

Earned minutes = 1,000 × 12 = 12,000
Available minutes = 40 × 480 = 19,200
Efficiency = 12,000 / 19,200 × 100 = 62.5%

Where this formula is explained

Industrial EngineeringGuide4 min read

Garment Line Efficiency: Formula, Example and Calculator

Line efficiency compares the minutes a sewing line earned with the minutes it had. Learn the formula, work through examples, understand what drives efficiency up and down, and avoid the reporting mistakes that make the number meaningless.

Industrial EngineeringGuide4 min read

What Is SMV? Standard Minute Value in Garment Manufacturing

SMV is the standard time to complete a task at a normal pace, including allowances. Learn what it includes, how it is set, how it drives targets, efficiency, capacity and CM cost, and where it goes wrong.