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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.
Line efficiency
Efficiency % = good units x SMV x 100 / (operators x minutes worked)
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%.
Rework and rejects consume operator minutes without earning standard minutes. Counting them as output hides the cost of poor quality.