Line Efficiency Calculator

Work out line efficiency instantly with clear inputs, formula shown and shareable results.

About Line Efficiency Calculator

Line efficiency compares standard minutes earned — good units x standard minute value — against operator minutes made available. It is the single figure garment and assembly plants manage by, because it captures method, skill, balance and downtime losses in one number.

Formula

Line efficiency

Efficiency % = good units x SMV x 100 / (operators x minutes worked)

Worked example

With the default values below, Line Efficiency Calculator returns Line Efficiency of 37.50%. Change any input above and every figure here is recalculated in your browser.

Inputs used

Good Units Producedminimum 0: 3,600
Standard Time Per Unitminimum 0.001 minutes: 1.2 minutes
Operators On The Lineminimum 1: 24
Minutes Worked Per Operatorminimum 1 minutes: 480 minutes

Results

Line Efficiency: 37.50%
Standard Minutes Earned: 4,320.0
Operator Minutes Available: 11,520.0
Minutes Not Converted To Output: 7,200.0

Step by step

1Values used
2Line efficiency
3Line Efficiency= 37.50
4Standard Minutes Earned= 4,320.0
5Operator Minutes Available= 11,520.0
6Minutes Not Converted To Output= 7,200.0

Assumptions and limits

The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

What efficiency should a line reach?

Mature garment lines run 55-75%; new styles start at 30-40% and climb along a learning curve. Machine-paced assembly lines routinely exceed 85%.

Why use good units rather than total?

Rework and rejects consume operator minutes without earning standard minutes. Counting them as output hides the cost of poor quality.