Production & IE Hub

Line efficiency (%) = (Total SAM produced ÷ Total minutes available) × 100. Total SAM produced = number of pieces produced × SAM of the style. Total minutes available = number of operators × working minutes per shift. A typical Bangladesh RMG sewing line achieves 50–65% efficiency at steady state; well-managed lines with experienced operators on established styles can reach 70–80%. Understanding why efficiency falls — style changeover, absenteeism, bottleneck operations, material delays — is as important as measuring it.

SAM (Standard Allowed Minutes) is the time a trained operator needs to complete one unit of work at standard pace, including PF&D (personal, fatigue and delay) allowances. SAM = SMV × (1 + allowance%). In Bangladesh RMG, allowances typically range from 15–20%. SAM is the foundation of all IE work: every daily production target, efficiency calculation, manpower plan, CM cost estimate, and delivery commitment depends on SAM accuracy. An SAM error of 1 minute on a 50,000-piece order changes the production timeline by 2–3 days and the CM cost by 5–8%.

Operators required = ⌈(Daily target × SAM) ÷ (Shift minutes × Efficiency%)⌉. Daily target = Order quantity ÷ available working days. Always round up to the next whole number. Never plan at 100% efficiency — use 60–70% for established styles, 50–60% for new styles in their first week. Our Manpower Requirement Calculator lets you enter the order qty, ship date, working days, SAM, shift length, and efficiency target and instantly outputs the required operator count and production timeline.

Under the Bangladesh Labour Act 2006 (as amended), overtime must be paid at double the basic wage rate. Workers cannot be compelled to work more than 2 hours overtime per day or 12 hours per week. Monthly overtime pay formula: OT pay = (Basic salary ÷ 208) × 2 × OT hours worked, where 208 is the standard monthly working hours (26 days × 8 hours). Our Overtime Calculator and Overtime Cost Calculator use this formula — essential for both HR departments and IE teams estimating the true cost of extending working hours to meet delivery deadlines.

Line balancing is the process of distributing sewing operations across workstations so that every operator's cycle time is as close as possible to the pitch time (target cycle time = SAM ÷ target output per minute). An unbalanced line has bottleneck operations where work-in-process (WIP) builds up, and idle operations where operators wait. Balance efficiency = (Sum of all operation times ÷ (Number of workstations × pitch time)) × 100. Our Line Balancing Calculator computes pitch time, balance delay, and balance efficiency, and highlights the bottleneck operations that need to be addressed.

OEE (Overall Equipment Effectiveness) is the gold-standard metric for manufacturing productivity, used in automotive, electronics, and increasingly in garment production. OEE = Availability × Performance × Quality. Availability = (Planned production time − Downtime) ÷ Planned production time. Performance = (Actual output ÷ Theoretical maximum output). Quality = (Good units produced ÷ Total units started). World-class OEE is considered 85%+; most Bangladesh factories measure OEE in washing and finishing equipment rather than sewing lines. Our OEE Calculator walks through all three components.

DHU (Defects per Hundred Units) is the primary quality KPI in garment manufacturing. DHU = (Total defects found ÷ Total pieces inspected) × 100. A single garment can carry multiple defects, so DHU can exceed 100. BGMEA and buyer audit requirements typically set an acceptable DHU of below 3.5–5.0 for ready-to-export garments. DHU is tracked at inline inspection (during sewing), end-of-line (end of assembly), and finishing inspection points. Our DHU Calculator also breaks down defect frequency by type, helping QC managers identify the root cause operations.

Daily production target setting asks: 'How many pieces should this line produce today?' — based on today's SAM, operator count, efficiency, and shift hours. Capacity planning asks: 'How many total pieces can this factory produce this month across all lines?' — and 'Can we accept this buyer order given current booked capacity?' Target setting is a floor management tool updated daily. Capacity planning is a commercial and merchandising tool used weeks or months in advance to book orders against available production slots and commit ship dates to buyers. Both use the same underlying SAM and efficiency data, but serve different decision-making contexts.