How Many Pieces Can Your Factory Actually Make in a Day?

Your factory's real daily capacity is not a formula. It is the average of what the line actually produced over the last 30 normal working days, read style by style from your own production register. The textbook method multiplies machines, hours, and efficiency against a measured SAM, and it works in factories with industrial engineering departments. A 30 machine factory has something more accurate: its own history. Yesterday's numbers already include the absent operators, the style change, and the power cut. Capacity questions are answered by counting, not calculating.

Why do delivery dates slip when the line looked free?

Because the promise is based on the factory's best remembered day, not its average day. The best day had full attendance, a style the operators had run for two weeks, and no thread or fabric waiting. The average day has two operators absent, a style change that costs the line its rhythm, and an hour lost to a breakdown or a late trim delivery. When you quote from the best day, every normal day puts you behind schedule, and the gap only becomes visible in the last week before shipment. The line was never free. It was running at its real speed while the commitment assumed an imaginary one.

What is the textbook capacity formula, and why does it fail small factories?

The standard calculation, published by industrial engineering references such as Online Clothing Study, is machines multiplied by working hours multiplied by 60, divided by the garment's SAM, multiplied by line efficiency. SAM is the standard minutes one piece should take, and keeping it honest needs stopwatch time studies, allowances, and someone to redo them every time a style changes. Efficiency is worse: the published range runs 50 to 90 percent, and a factory that has never measured its own usually sits near the bottom while assuming the middle. The formula is not wrong. It is unusable in a factory where the owner is also the merchandiser, the quality head, and the cashier, so it produces confident numbers built on guessed inputs.

What should a small factory use instead of SAM?

Use your production register. Take the last 30 working days, group output by style family, basic tee, polo, leggings, whatever your floor actually runs, and average the daily pieces for each. That average is your real capacity, because it already carries everything the formula tries to estimate: absenteeism, style changes, breakdowns, late trims, festival weeks. Note your worst normal week too, because buyers are promised averages but shipments are saved by knowing the floor's bad weeks. If you are not recording daily output per order yet, that is the gap to close first, and it is the same record that tells you your real cost per piece.

How do you turn last month's numbers into a delivery date?

Divide the order quantity by your measured daily average for that style family, and you have sewing days. Add cutting lead time, add the days this order waits behind what is already on the line, and add a margin for the learning curve if the style is new, because the first days of any new style run well below average, and your own register will show you how far below. A 20,000 piece order at a measured 1,500 pieces a day is 14 sewing days after the queue clears, not from the day you sign. Check the total against your order book before you answer the buyer, because capacity you have already sold is not capacity. If the date does not fit, negotiate quantity or date in the first conversation, when you still have leverage. A refused date rarely loses a buyer. A missed one often does.

What should you write down every evening?

Four columns: date, order or style, pieces out at end of line, operators present. It takes ten minutes after the last bundle and needs nothing but a notebook or a phone. In a month you have per-style capacity no consultant could have told you. In a quarter you can see which styles the floor runs fast, what absenteeism actually costs in pieces, and whether the line is drifting slower or faster. This is the discipline that replaces the industrial engineering department, and it costs nothing but the habit.