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Efficiency Calculator
Line or operator efficiency — SMV, minutes produced and worked.
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Production Target Calculator — Daily & Hourly Output
Calculate daily and hourly production targets for any garment style from SAM, operators, working minutes and target efficiency. Enter order quantity to find the number of days needed to complete an order. Standard IE formula used in Bangladesh RMG factory planning. No account needed — numbers update as you type.
Targets are based on available minutes and target efficiency — not best-case efficiency. For new styles, use 50–55% efficiency in the first week due to learning curve, not your steady-state figure. Always add a 5–10% buffer to delivery timelines before committing ship dates to buyers.
Step By Step
How to Use This Calculator
7 steps
- Enter the SAM (Standard Allowed Minutes) for the style from your IE time study sheet.
- Enter the number of operators allocated to the line for this style.
- Enter working minutes per day — 480 min for an 8-hour shift; use 450 if two 15-minute breaks are deducted.
- Set the target efficiency percentage — use your factory's actual rolling average for this product type, not best-ever efficiency.
- Select number of shifts per day (1, 2 or 3).
- Optionally enter the order quantity to calculate the number of working days needed to complete the order.
- Use the result to build your production schedule and commit a ship date.
Worked Example
Worked example — woven shirt order, 40-operator line
Use this sample to sanity-check your inputs and understand what the final result represents.
- 1SAM: 25.0 min · Operators: 40 · Working minutes: 480 · Shifts: 1
- 2Target efficiency: 65%
- 3Daily target = (40 × 480 × 0.65) ÷ 25 = 12,480 ÷ 25 = 499 pcs/day
- 4Order quantity: 15,000 pcs
Final Result
Daily target: 499 pcs · Hourly: 62 pcs · Days to complete order: 31 days (≈ 5.1 weeks at 6-day week).
Methodology
Production Target Formula — IE standard
This section explains the calculation logic, assumptions, and source material used to make the result more trustworthy and easier to verify.
Daily Target = (Operators × Working Minutes per Day × Target Efficiency%) ÷ SAM × Number of Shifts. Hourly Target = Daily Target ÷ (Working Hours per Day × Shifts). Pieces per Operator per Day = Daily Target ÷ Operators. Days to Complete Order = ORDER QTY ÷ Daily Target (round up to next whole day). Source: ILO Work Study (4th edition, Kanawaty), Chapter 22; BGMEA IE Guidelines 2022. This formula is identical to the line efficiency formula rearranged to solve for output rather than efficiency percentage.
Practical Guidance
Production planning accuracy — what IE managers do
- 1Build your schedule with 55% efficiency for week 1 of a new style, 60% for week 2, then steady-state by week 3 — this mirrors the learning curve documented in ILO Work Study research
- 2Add non-production time as a deduction from available minutes: daily briefings (~10 min), machine maintenance windows (~15 min/week), and QC sampling time — these are real drains not captured in the efficiency figure
- 3For multi-size orders, calculate weighted average SAM across the size ratio — a size L shirt with extra panels has a higher SAM than a size S; a 1:2:2:1 size ratio gives a different weighted SAM than all-medium
- 4Track shipment completion rate by line and by style every week — consistently missing 3-day rolling targets is a leading indicator of a late shipment, giving you time to intervene
- 5For multi-line factories, use this calculator for each line separately — pooling operators and SAM across lines hides individual line problems
- 6Never use overtime as the primary strategy for meeting delivery — factor OT cost into the order at quoting stage if it is genuinely needed, rather than treating it as a contingency that erodes margin
Frequently Asked Questions
How is production target calculated in garment factories?+
The standard formula is: Daily Target = (Operators × Working Minutes × Target Efficiency%) ÷ SAM. For example, a 30-operator line running 480 minutes at 65% efficiency on a 15-SAM style produces: (30 × 480 × 0.65) ÷ 15 = 9,360 ÷ 15 = 624 pieces per day. Hourly target = 624 ÷ 8 hours = 78 pieces per hour. This formula is the foundation of IE production planning in all Bangladesh RMG factories and is documented in the ILO Work Study manual (4th edition, Kanawaty, Chapter 22) and the BGMEA IE Guidelines 2022.
What efficiency percentage should I use for target-setting?+
Use your factory's actual rolling average efficiency for this product type — not best-day efficiency. If your polo shirt lines averaged 62% efficiency last quarter, use 62% as your planning base. Applying optimistic efficiency to targets creates unrealistic goals that are missed from day one, demoralise supervisors and lead to accepting too many orders for available capacity. For new styles with no history, use 55% for the first two weeks and review after the learning curve stabilises.
How do I plan a production schedule for a buyer's delivery date?+
Work backwards from the ship date. Deduct: (1) finishing, packing and QC time — typically 3–5 working days; (2) any pre-production requirements on the sewing floor (first output checks, PP sample approval waiting days). Divide the order quantity by the daily production target to get sewing production days needed. Add learning curve days for new styles (typically 3–5 extra days in week 1). Add a 3–5 day safety buffer for material delays and machine issues. If the available sewing days are insufficient, immediately discuss options: adding operators, adding a Saturday shift, or adjusting the ship date — the earlier this conversation happens, the better.
What is the impact of adding operators on production target?+
Production target scales directly with the number of operators (all else equal). Adding 5 operators to a 25-operator line increases available minutes by 20%, increasing daily target by 20% — provided the line is properly balanced and the new operators are fully trained on their operations. In practice, adding operators to an unbalanced line only moves the bottleneck — you need to balance operations first (ensure no single operation takes significantly more time than others), then scale up headcount. ILO Work Study (Chapter 22) covers line balancing methodology.
How does the number of shifts affect production targets?+
Running 2 shifts doubles your available working minutes per day and therefore doubles your daily production target (assuming similar efficiency per shift). Shift 2 efficiency is typically 5–10% lower than shift 1 due to fatigue, lower supervisory density and maintenance windows between shifts. Use this calculator with the number of shifts set to 2 to see the combined target. Note that running 2 shifts doubles your variable labour cost (wages + OT), utility cost and supervisory cost for that day — factor this into your CM if multi-shift is needed to meet the delivery.