Bags Per Cone Calculator for Bag Closing Thread
How many bags one cone will close, and how many cones your next run needs. Enter the bag mouth width, the chain your closer runs and the metres on your cone.
- Thread per bag
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- Thread per 1,000 bags
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- Cones per 10,000 bags
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- Cones per 1 lakh bags
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- Cones per 5 lakh bags
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What this calculator does
Bag closing thread consumption is driven by one thing: how far the sewing head travels across the mouth of the bag. From that it works out the metres each closure takes, how many bags a single cone will close, and how many cones a run of 10,000, 1 lakh or 5 lakh bags needs.
Every figure comes back as a range because the chain-off tail your machine leaves at each end of a seam varies. The consumption figures behind it are Mahalaxmi Thread production data from our own and our customers' lines, not garment tables — those assume around 18 stitches per inch on thin fabric, nothing like a bag closer running an 8–10 mm stitch through woven PP. Plan against the lower bag count and the higher cone count.
How to use it
Measure across the open mouth of the bag and enter that, in inches, mm or cm — the quick-picks are the sizes woven sacks are traded in, 18 x 30 through 26 x 44 in. Pick the chain your closer runs, set the metres on your cone, and the results update as you go. If your cones are labelled by weight rather than length, ask us for the metres on your exact ticket rather than converting.
Formulas
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thread per bag = bag mouth width × chain consumption × seamsChain consumption is a multiple of the bag width, set by whether you run a single, double or quad chain stitch. It already includes normal sewing wastage, so do not add a further percentage on top. -
bags per cone = cone length ÷ thread per bagBoth sides in metres, which is why nothing here depends on cone weight. -
thread per 1,000 bags = thread per bag × 1,000What a thousand closures costs you in metres, for costing a run. -
cones for a run = (bags × thread per bag) ÷ cone lengthRounded up, because a part cone is not something you can order.
Examples
A 50 kg woven PP sack, 24 in mouth, double chain on the mouth seam, from a 5,000 m cone:
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24 in = 0.61 m → 1.52 – 1.68 m per bagThe width in metres against the double chain figure, mouth seam only. -
5,000 m ÷ 1.52 – 1.68 m → 2,982 – 3,280 bagsWhat one cone closes. Stock against 2,982, not 3,280. -
1,000 bags → 1,524 – 1,676 mRoughly a third of a cone per thousand bags at this size. -
10,000 bags → 4 conesAt this size the range is tight enough that both ends round to the same cone count. -
1 lakh bags → 31 – 34 conesThree cones between the optimistic and cautious end of the same run. -
5 lakh bags → 153 – 168 conesFifteen cones apart — which is where guessing the tail starts to cost real money.
Frequently asked questions
Why is the answer shown as a range instead of one number?
Because every machine leaves a different chain-off tail at the start and end of a seam. The bag itself is a fixed width, but the tail is not, and across thousands of bags it adds up. The range covers a tight tail at one end and a generous one at the other, so your real figure will sit inside it. Plan stock against the lower bag count.
Does the calculation already include wastage?
Yes. Normal sewing wastage is built into the consumption figure, so you should not add a further wastage percentage on top. If you want stock cover for demand swings or delivery lead time, add that as safety stock in the monthly requirement calculator instead.
My cones are labelled in kilograms, not metres. What do I enter?
Ask us for the length of your exact ticket. Length per kilogram changes with count, ply and finish, so converting from weight introduces error we would rather not build into a public tool. Give us the ticket number and cone weight and we will confirm the metres.
What is the difference between single, double and quad chain for thread use?
Single chain is a one-thread chain stitch and uses the least thread. Double chain, the standard closure for woven PP and HDPE sacks, uses roughly twice as much. Quad chain doubles it again and is used where seam security matters most, such as FIBC panels and heavy feed or mineral bags.
Does bag width matter more than bag weight rating?
Yes. Thread consumption is driven by the distance the sewing head travels across the mouth of the bag, not by what the bag holds. A 50 kg sack and a 25 kg sack of the same mouth width consume the same thread per closure.
Threads this calculator is built for
Both of our bag closing ranges run in the calculator above: Spun Polyester Bag Closing Thread for FIBC, feed, fertilizer and cement sacks, and Polypropylene Bag Closing Thread for high-speed lines and bulk agro and mineral packaging. See the full bag closing and packaging thread range.
Related calculators
- Sewing Thread Count Converter Ne, Tex, dtex, denier, metres per kg and yards per lb, in both directions and ply-aware.
- Monthly Bag Closing Thread Requirement Calculator Bags per day into cones per month, with how long a single cone lasts on your line.
- Spun Polyester to Polypropylene Thread Converter The equivalent bag closing thread in the other range, either direction, matched on strength or thickness.
- Bag Closing Needle Size Calculator The needle range published for a given bag closing thread, or every bag closing thread that runs on the needle already in your machine.
Need the exact figure for your line?
Send us your bag size, machine and monthly volume and we will confirm the right ticket, the right cone size, and the real consumption on your setup. Talk to our technical team.