Steel & workshop materials

Steel Weight Calculator In Kg, Pakistan

Steel in Pakistan is bought by weight and used by length, and almost every disagreement at the supplier counter happens in the gap between the two. You need forty feet of fifty millimetre square tube; the invoice is in kilograms. Unless you can convert between them you are taking somebody else’s word for the quantity.

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This calculator covers the sections actually sold in the local market: round pipe, square and rectangular tube, angle, channel, round and square bar, flat patti, hex bar, plate and sariya. Pick a section, type the dimensions from your tape or the supplier’s label, and it gives the weight per metre and the total for the quantity you need. Items build into a schedule, so you can price a whole job in one place.

What This Tool Does

It calculates theoretical weight per metre for eleven section types across eight materials, totals the weight for your lengths and quantities, converts to maunds, and prices the lot at your own rate per kilogram. Each item you add stays in a schedule you can export.

Who It Is For

Fabricators and welders working out what to buy for a job.
Homeowners and contractors checking that a delivered quantity matches the invoice.
Anyone buying steel who wants to convert between the length they need and the weight they pay for.
Students and site engineers who need quick theoretical weights with the formula shown.

How To Use It

Choose the section shape. The dimension fields relabel themselves to match, so a pipe asks for outside diameter and wall thickness while an angle asks for both legs and a thickness.
Choose the material. Mild steel covers ordinary iron sections; GI is the same density; stainless and aluminium are different and are offered separately.
Enter the dimensions in millimetres, which is how sections are specified even when lengths are in feet.
Enter the length of one piece and how many pieces you need. Length takes feet, inches, millimetres or metres.
Add your supplier rate per kilogram if you want a cost. Leave it blank for weight only.
Press add to put the item in the schedule, then change the shape and add the next item. The running total covers everything in the list.

Inputs And Units Explained

Section and material — together these decide the weight per metre. The material list shows each density so nothing is hidden.
Dimensions — in millimetres. For hollow sections the wall thickness matters as much as the outside size, and the tool refuses impossible combinations such as a wall thicker than half the tube.
Length of each piece — the cut length you need, not the stock length, unless you are buying full lengths.
Quantity — how many pieces of that size.
Rate per kilogram — your supplier’s current figure. Nothing is assumed.

How The Calculation Works

Every figure comes from cross-sectional area multiplied by density. Mild steel is taken as 7,850 kg per cubic metre, stainless 304 as 7,930, aluminium as 2,700, and each is shown in the material list. The area formulas are the standard ones: a round bar is π÷4 × d², a square bar is the side squared, a flat bar is width times thickness, and a round pipe is π × (outside diameter − wall) × wall, which is the exact identity for an annulus.

Square and rectangular hollow sections use the cold-formed convention that accounts for corner radii, which is why a 50 × 50 × 3 mm tube comes out at about 4.25 kg per metre rather than the 4.43 a sharp-cornered calculation would give. Angle uses thickness × (leg + leg − thickness), a sharp-corner approximation that sits within about one and a half per cent of catalogue values. Deformed rebar uses the standard d² ÷ 162 rule, so a 12 mm bar is 0.888 kg per metre.

These are theoretical weights, which is the basis suppliers invoice on. A weighbridge figure will differ slightly because of rolling tolerance, and for very precise work the mill’s own catalogue is the final word.

Worked Example

A fabricator needs four lengths of 25 × 25 × 2 mm square tube, each 20 feet long, for a grill job.

Input or result	Value
Section	Square tube 25 × 25 × 2 mm, mild steel
Weight per metre	1.36 kg/m
Length of each piece	20 ft (6.096 m)
Quantity	4 pieces
Total theoretical weight	about 33.2 kg
In maunds	about 0.83 maund at 40 kg

Thirty three kilograms is what the invoice should be based on. At the rate the supplier quoted, the tool prices it, and the item stays in the schedule so the sheet and bar for the same job can be added and totalled together.

Features And Benefits

Eleven section types and eight materials in one place, rather than a separate calculator for each.
Mixed units, so you can enter millimetre dimensions and feet lengths without converting by hand.
A running schedule with weights and costs, exportable as CSV.
Maund conversion at the standard 40 kg, for suppliers who still quote that way.
Impossible geometry is rejected with a clear message instead of a wrong answer.

Assumptions And Accuracy Limits

All weights are theoretical. Actual sections vary with rolling tolerance, and hot-rolled channels in particular differ from the formed-channel formula used here.
For critical quantities, check the mill or supplier catalogue for the exact section.
Densities are typical published values. Specific alloys differ, and the figure used is shown so you can judge.
The tool does not know what section your job needs. That is a design question.

Common Mistakes To Avoid

Confusing nominal and actual size. Pipe is often sold by a nominal bore that is not its outside diameter. Measure the outside diameter and the wall.
Ignoring wall thickness. A 50 mm tube in 1.6 mm steel weighs barely half of one in 3 mm. Most pricing arguments trace back to this.
Using the steel density for aluminium. Aluminium is roughly a third of the weight. Pick the material in the list.
Expecting the weighbridge to match exactly. A few per cent difference is normal and not evidence of a problem.

Steel Weight In Kg And Per Foot: How Pakistani Suppliers Quote

A steel supplier in Islamabad or Rawalpindi may quote by the kilogram, by the piece or by the foot, and the length you need is usually written in feet. To compare quotes you have to convert between them, which is where mistakes creep in. A 20 foot piece of square tube and a 6 metre piece are not the same length, and the weight per foot is not the same for every wall thickness.

This steel weight calculator accepts feet or metres, the section size and the wall thickness, and returns the weight in kilograms for one piece and for the whole order. Check it against the supplier’s own chart before you pay.

Frequently Asked Questions

How do I calculate the weight of a steel pipe?

Multiply π by (outside diameter minus wall thickness) by wall thickness to get the cross-sectional area in square millimetres, then multiply by the density and divide appropriately for units. The tool does it for you, but the formula is there so you can check it: a 48.3 mm pipe with a 3.2 mm wall comes out at about 3.56 kg per metre.

What is the formula for sariya weight?

The standard rule for deformed bar is diameter squared divided by 162, giving kilograms per metre. A 12 mm bar is 0.888 kg per metre and a 16 mm bar is 1.58 kg per metre. There is a separate sariya and sutar planner that also handles the traditional sutar size names.

Why does your square tube weight differ from another calculator?

Most likely because the other one uses a sharp-cornered approximation. Real cold-formed tube has rounded corners, which removes a small amount of steel, and this tool uses the convention that matches catalogue masses. For a 50 × 50 × 3 mm tube the difference is about four per cent.

Does it work for aluminium and stainless steel?

Yes. Pick the material and the density changes accordingly. Aluminium at 2,700 kg per cubic metre and stainless 304 at 7,930 are both in the list, with the figures shown so you can substitute your own if your supplier quotes a different alloy.

Can I price a whole job rather than one section?

Yes, that is what the schedule is for. Add each section as a separate item and the total weight and cost accumulate. For a full purchase list with supplier names and dates, use the steel material list builder.

How do I calculate steel weight in kg?

Find the volume of the section in cubic millimetres, multiply by the density of steel, which is about 7,850 kg per cubic metre, and convert to kilograms. For common shapes the tool applies the right formula once you enter the dimensions.

How do I calculate steel weight per foot?

Work out the weight per metre first, then multiply by 0.3048 to get the weight of one foot. Enter the length in feet in this tool and it converts for you.

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Get A Measured Quotation

If the weights here are for a job rather than a purchase check, the fabrication itself is what Ramzan Steel Works does: steel fabrication, gates, grills, railings, sheds and frames across Islamabad and Rawalpindi.