Theoretical Steel Weight Calculation Formula (2018 Updated)

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

However, the weight calculation formula is written in the calculator by the developers, you still don’t know whether their formula is correct.

And sometimes, you want to learn the weight calculation formula and remember it in your mind.

In this case, the weight calculator is not suitable for you.

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

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

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

You can also use Tube & Rod Weight Calculator to calculate the weight.

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

Steel Rod (kg)=0.00617×dia.×dia.×length

Square Bar (kg)=0.00785×width×width×length

Hexagon Bar (kg)=0.0068×across width×across width×length

Octagonal Steel (kg)=0.0065×across width×across width×length

Rebar (kg)=0.00617×dia.×dia.×length

Angle Steel (kg)=0.00785×(width+width-thickness)×thickness×length

Flat Steel (kg)=0.00785×thickness×width×length

Steel Tube (kg)=0.02466×thickness×(O.D-thickness)×length

Steel Plate (kg)=7.85×thickness×end area

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”

2018-03-07T15:48:50+00:00 Steel|


  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

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