Stack Calculator answers how much a stack or a store will hold, before it is built or filled: bags per row, rows, layers and bag weight in — total bags and tonnage out.
It is free, needs no account, and now keeps what you measure. Name a stack, save it, and it stays on the device with every other stack you have measured, so a godown can be worked through one stack at a time and totalled at the end.
Every saved measurement prints as a PDF with the arithmetic shown — bags per row multiplied by rows multiplied by layers, then by bag weight. That matters because a stack count is frequently disputed, and a figure somebody has to take on trust is a figure that gets argued with. A paper showing the working is settled by looking.
The whole set exports together as a PDF or a spreadsheet, which is what a warehouse manager actually hands over at the end of a stocktake.
It is deliberately about capacity and not about safety. How much a stack will hold is arithmetic; whether a stack of that height will stand up is a structural question about the bag, the floor and the wall, and this tool does not pretend to answer it.
Data is kept on the device only, and the screen says so plainly — it survives closing the app but not clearing the browser, and it does not follow you to another phone. That is exactly what the paid warehouse product is for.
How to use Stack Calculator
What it is. The number of bags and the tonnage in a stack, from bags per row, rows, layers and bag weight — saved under a name, printed with the arithmetic shown.
When to open it. At a stocktake, before a stack is built, when a buyer or a lender asks what is in the godown, and any time a bag count is disputed.
Have ready.
Bags along one row, counted on the floor.
Number of rows in the stack.
Number of layers, counted up the side.
The weight of one bag in kilograms — the filled weight, not the sack's nominal size.
Step by step.
Count bags per row on the ground and the number of rows. Together these are one layer.
Count the layers up the side of the stack. This is the number people get wrong, because the top layer is often incomplete.
Enter the bag weight in kg. A 50 kg bag is 50; a 'quintal' bag is 100.
Name the stack and save it. The crop and lot fields are optional but a nameless stack is useless a week later.
Export the PDF. It shows bags per row times rows times layers times bag weight, so the count can be settled by looking rather than by arguing.
What it will not do. It is arithmetic about capacity, not a judgement about safety. Whether a stack of that height will stand depends on the bag, the floor and the wall, and this does not know any of them. It also cannot see the godown: a stack quietly sold is still in the list until somebody says otherwise.
Every setting in Stack Calculator, explained
Stack name
What this stack is called in the godown. How to choose: Something physical — 'back wall, left', 'lot 14' — not a number you will have to remember. If it is wrong: The arithmetic is unaffected; the stocktake becomes unreadable.
Crop
What is in the bags. Optional. How to choose: Fill it in on any stocktake with more than one commodity, which is most of them. If it is wrong: The total tonnage is still right, but a mixed godown's report cannot be split by commodity.
Bags per row
How many bags lie along one row of one layer. How to choose: Count, do not estimate, and count the same row twice if the stack is deep. If it is wrong: The error multiplies by rows and by layers. One bag miscounted in a 12-row, 10-layer stack is 120 bags — six tonnes at 50 kg.
Number of rows
How many rows sit side by side in one layer. How to choose: Rows are counted across the stack, at ground level. If it is wrong: Same multiplication as above. This and bags-per-row are the two figures worth checking twice.
Number of layers
How many bags high the stack is. How to choose: Count up the side. If the top layer is part-filled, count the full layers here and record the part layer as a separate stack rather than rounding. If it is wrong: Counting a part-filled top layer as full is the most common single source of an overstated godown.
Bag weight (kg)
The weight of one filled bag. How to choose: Weigh one. Nominal sizes and actual fill diverge, and on a thousand bags the gap is tonnes. If it is wrong: Tonnage is out by exactly that proportion, while the bag count stays right — which is why the PDF prints both.
A worked example
A wheat stack against the back wall: 20 bags along a row, 12 rows, 9 layers high, in 50 kg bags.
What goes in:
Bags per row 20
Rows 12
Layers 9
Bag weight 50 kg
What comes out:
20 × 12 = 240 bags in a layer
240 × 9 = 2,160 bags in the stack
2,160 × 50 kg = 108,000 kg, which is 108 tonnes
If the top layer turns out to be only half covered, that is 120 bags and six tonnes of wheat that are not there. Record eight full layers and the part layer separately rather than calling it nine.
How to read what it gives you
The bag count and the tonnage fail independently. A miscounted layer gets the count wrong; a wrong bag weight gets only the tonnage wrong. The printed working shows which.
The PDF exists because a bag count is argued about. A figure somebody has to take on trust gets disputed; a sheet showing 20 × 12 × 9 × 50 gets checked and agreed.
The whole set of saved stacks exports together as a PDF or a spreadsheet, which is the document a stocktake actually ends with.
What usually goes wrong
Counting a part-filled top layer as a full one.
Using the sack's printed size instead of the weight of a filled bag.
Measuring one stack and multiplying by the number of stacks. Stacks in a real godown are not identical, and this tool is quick enough to do each one.
Treating the saved list as a permanent record. It lives on this device only — it survives closing the app, not clearing the browser, and it does not follow you to another phone.
Questions people ask about Stack Calculator
How do I calculate how many bags are in a godown stack?
Bags per row, multiplied by the number of rows, multiplied by the number of layers. Twenty bags in a row, twelve rows, nine layers is 2,160 bags. Multiply by the weight of one filled bag for the tonnage.
How many 50 kg bags make a tonne?
Twenty. So 2,160 bags of 50 kg is 108 tonnes. For 100 kg bags it is ten to the tonne.
Is the Stack Calculator free?
Yes, and it needs no account. Saved stacks are kept on your own device. The paid warehouse product is what keeps them on a server, across devices, with stock movements and inspection dates.
Why does the PDF show the multiplication?
Because stack counts get disputed, and a number with no working behind it is a number somebody argues with. A sheet that shows the four figures and the result is settled by looking at it.
Does it account for a stack that is not a neat block?
No. It assumes every layer is the same and every row is full. Where a stack is stepped or part-covered, measure the full block and the remainder as two stacks — which is more accurate than any allowance the tool could make for you.
Want to use Stack Calculator for real, right now? Open Stack Calculator in the Laisha app → Ten days free, no card. After that 10 US dollars a month, one price worldwide.