Theoretical Steel Weight Calculation Formula (With Online Calculator)

If you’re working in the metalworking industry, even you’re engineers, you will try to find one calculator to help you calculate the weight of various metals and steels including ms plate, gi sheet, structural steel, ms angle, mild steel, steel bar, square tube, angle, aluminum etc.

Below is the theoretical steel weight calculator for you to calculate various metals. What you need to do is calculate the sectional area and find the metal density.

You can also refer to Density Table of Metals (Iron, Steel, Brass, Aluminum) and AlloysDensity Table for Commonly Used Sheet Metal Materials.

From the above two posts, you will find the density of various metals and alloys.

However, sometimes you may want to learn the weight calculation formula and keep it in your mind, here is it:

Weight (kg) = Sectional Area (mm2) × Length (m) × Density (ρ, g/cm3)× 1/1000

In order to help you quickly find the metal weight formula, I made infographic which is not only practical but also beautiful.

Besides, recently I’m working on making steel weight chart in order to help the one who needs it. However, when I finished it, I find the steel weight calculation formula is much more convenient and accurate than the steel weight table.

If you want the PDF version of the weight calculation formula, you can save below infographic or bookmark in the web browser.

P.S: You can click to check out the H Beam & I Beam Weight Calculator (Weight Chart in Kg).

Theoretical steel weight calculation formula

Steel Plate

Steel plate weight calculation formula

  • Formula: 7.85×length (m)×width (m)×thickness (mm)
  • E.g: 6m (length)×1.51m (width)×9.75mm (thickness)
  • Calculation: 7.85×6×1.51×9.75=693.43kg

Steel Tube

Steel Tube weight calculation formula

  • Formula: (OD-Wall thickness)×Wall thickness (mm)×0.02466×length (m)
  • E.g: 114mm(OD)×4mm (Wall thickness) × 6m (length)
  • Calculation: (114-4)×4×0.02466×6=65.102kg

Round Steel

Round Steel weight calculation formula

  • Formula:××0.00617×length (m)
  • E.g: Φ20mm (Dia.)×6m (length)
  • Calculation: 20×20×0.00617×6=14.808kg

Square Steel

Square Steel weight calculation formula

  • Formula: Edge width (mm)×Edge width (mm)×length (m)×0.00785
  • E.g: 50mm (Edge width)×6m (length)
  • Calculation: 50×50×6×0.00785=117.75(kg)

Flat Steel

Flat Steel weight calculation formula

  • Formula: Edge width (mm)×thickness (mm)×length (m) × 0.00785
  • E.g: 50mm (Edge width) × 5.0mm (thickness)×6m (length)
  • Calculation: 50×5×6×0.00785=11.7.75(kg)

Hexagonal Steel

Hexagonal Steel weight calculation formula

  • Formula: Edge-to-edge Dia.×Edge-to-edge Dia.× length (m)×0.0068
  • E.g: 50mm (Dia.) ×6m (length)
  • Calculation: 50×50×6×0.0068=102(kg)


Rebar weight calculation formula

  • Formula:××0.00617×length (m)
  • E.g: Φ20mm(Dia.)×12m (length)
  • Calculation: 20×20×0.00617×12=29.616kg

Flat Steel Tube

Flat Steel Tube weight calculation formula

  • Formula: (Edge length + Edge width) × 2 × thickness×0.00785×length (m)
  • E.g: 100mm×50mm×5mm (thickness)×6m (length)
  • Calculation: (100+50) × 2×5×0.00785×6=70.65kg

Rectangular Steel Tube

Rectangular Steel Tube weight calculation

  • Formula: Edgewidthmm×4×thickness×0.00785×length(m)
  • E.g: 50mm×5mm (thickness)×6m (length)
  • Calculation: 50×4×5×0.00785×6=47.1kg

Equal-leg angle Steel

Equal-leg angle steel Steel Tube weight calculation formula

  • Formula: (Edge width×2-thickness)×thickness×0.00785×length (m)
  • E.g:  50mm×50mm×5 thickness×6m(length)
  • Calculation: (50×2-5)×5×0.00785×6=22.37kg

Unequal-leg Angle Steel

Unequal-leg Angle Steel weight calculation formula

  • Formula: (Edge width+Edge width-thickness) × thickness×0.0076×lengthm
  • E.g: 100mm×80mm×8 thickness×6m(length)
  • Calculation: (100+80-8) × 8×0.0076×6=62.746kg

Other nonferrous metals

Brass Tube

Brass Tube weight calculation formula

  • Formula: (OD-Wall thickness) × thickness×0.0267×lengthm
  • E.g: 20mm×1.5mm (thickness)×6m(length)
  • Calculation: (20-1.5) × 1.5×0.0267×6=4.446kg

Copper Tube

Copper Tube weight calculation formula

  • Formula: (OD-Wall thickness) × thickness×0.02796×length (m)
  • E.g: 20mm×1.5mm (thickness)×6m(length)
  • Calculation: (20-1.5) ×1.5×0.02796×6=4.655kg

Aluminum Embossed Sheet

Aluminum Embossed Sheet weight calculation formula

  • Formula: length (m)×width (m)×thickness (mm)×2.96
  • E.g: 1m width×3m length×2.5mm thickness
  • Calculation: 1×3×2.5×2.96=22.2kg
Brass Plate weight calculation formula

Brass Plate

Ratio: 8.5

Copper Sheet weight calculation formula

Copper Sheet

Ratio: 8.9

Zinc Plate weight calculation formula

Zinc Plate

Ratio: 7.2

Lead Plate weight calculation formula

Lead Plate

Ratio: 11.37

Calculation Method: ratio × thickness = weight / ㎡

Related Various Theoretical Metal Weight Calculation Formula

Octagonal Steel (kg)=0.0065×across width×across width×length
Flat Steel (kg)=0.00785×thickness×width×length
Round Copper Rod (kg)=0.00698×dia.×dia.×length
Round Brass Rod (kg)=0.00668×dia.×dia.×length
Round Aluminum Rod (kg)=0.0022×dia.×dia.×length
Square Red Copper Rod (kg)=0.0089×width×width×length
Square Brass Copper Rod (kg)=0.0085×width×width×length
Square Aluminum Rod (kg)=0.0028×width×width×length
Hexagonal Copper Rod (kg)=0.0077×across width×across width×length
Hexagonal Brass Rod (kg)=0.00736×width×across width×length
Hexagonal Aluminum Rod (kg)=0.00242×across width×across width×length
Copper Plate (kg)=0.0089×thickness×width×length
Brass Plate (kg)=0.0085×thickness×width×length
Aluminum Plate (kg)=0.00171×thickness×width×length
Round Red Copper Tube (kg)=0.028×thickness×(O.D-thickness)×length
Round Brass Tube (kg)=0.0267×thickness×(O.D-thickness)×length
Round Aluminum Copper Tube (kg)=0.00879×thickness×(O.D-thickness)×length

Note: in above formula, the unit of length is “m”,unit of area is “㎡”,the rest unit is “mm”



  1. lekh2003 January 3, 2018 at 4:00 pm - Reply

    These formulas are correct. The formulas are easily derived through the equation m=pv

    “m” is the mass of the object.
    V is what you have to calculate as the volume.
    p is the density.

    The website is simplifying this formula into situation specific equations which can be derived from common variables you might know.

  2. AN February 1, 2018 at 3:01 pm - Reply

    You say: “If you want the PDF version of the weight calculation, you can save below infographic or bookmark in web browser.”
    everything on this page is protected so no possibility to save or copy anything from it…

    • MachineMfg February 1, 2018 at 7:28 pm - Reply

      in order to protect it, we limit the downloads. However, you can save the bookmark in your browser for future convenience checking.

  3. NIRBHAY March 3, 2018 at 7:18 pm - Reply


    • MachineMfg March 4, 2018 at 10:35 am - Reply

      this formula is one simple way to calculate rebar weight based on experience. You can also calculate based on the round steel weight calculation formula above.

  4. ryne lee March 15, 2018 at 2:41 pm - Reply

    very useful for sheet metal fabricators!

  5. larry roderick April 2, 2018 at 6:56 am - Reply

    I need it in non metric measurements

    • MachineMfg April 2, 2018 at 11:40 am - Reply

      Sorry larry, we currently only have the metric measurement.

  6. Stephen April 12, 2018 at 10:38 pm - Reply

    I have gone through the formulas, they were helpful and correct except for one or two that need more explanation.

    Besides that, you have really done a very good job. Well done.

  7. gody April 14, 2018 at 3:46 am - Reply

    thanks to you sir,very heplful this formula.really good and very exactly solution.

  8. Rupesh Patil April 18, 2018 at 8:41 pm - Reply

    it is very good for immediate calculation

  9. anil May 3, 2018 at 8:22 pm - Reply

    where is born 0.02466

    • MachineMfg May 4, 2018 at 8:44 am - Reply

      from engineer’s experience

  10. Hussnain Bilal May 24, 2018 at 7:46 pm - Reply

    Very useful and good collection

  11. Sam June 7, 2018 at 9:12 pm - Reply

    Steel sheets

  12. pawan singh June 16, 2018 at 12:58 pm - Reply

    very useful

  13. echesconazzyann July 11, 2018 at 1:42 pm - Reply

    Comment…what of the density

    • MachineMfg July 11, 2018 at 4:40 pm - Reply

      Most of the density of the steel should be confirmed by your steel suppliers. Probably we will update this later for your reference.

  14. Sanjeev August 1, 2018 at 4:24 pm - Reply

    Very Useful for engineers, Thank you for your valuable post. MS Channel weight formula also , if you have please share it.

    • MachineMfg August 1, 2018 at 5:57 pm - Reply

      will update the formula in the near future, so stay turned.

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