Theoretical Metal Weight Calculation Formula (30 Types of Metals)

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.

Theoretical Metal Weight Calculator

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

For the metal density, you can also refer to:

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. (To the bottom)

P.S: Among all of the metal weight calculation formula in the following part, there are two kinds of metals that are not mentioned, which are I beam steel and H beam steel.

If you want to know the difference between H beam steel and I beam steel as well as the methods to calculate the weight of H beam steel and I beam steel, you will get the answers from the following two quick links:

Theoretical Steel Weight Chart

If you want to get the weight of various metals from the chart, you can refer to the following page:

Steel plate weight calculation formula

Steel Plate

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

Steel Tube weight calculation formula

Steel Tube

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

Round Steel weight calculation formula

Steel Rod

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

Square Steel weight calculation formula

Square Steel

• 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 weight calculation formula

Flat Steel

• 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 weight calculation formula

Hexagonal Steel

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

Flat Steel Tube weight calculation formula

Flat Steel Tube

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

Rectangular Steel Tube weight calculation

Rectangular Steel Tube

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

Equal-leg angle steel Steel Tube weight calculation formula

Equal-leg Angle Steel

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

Unequal-leg Angle Steel weight calculation formula

Unequal-leg Angle Steel

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

Brass Tube weight calculation formula

Brass Tube

• Formula: (OD-wall thickness)×thickness(mm)×length(m)×0.0267

Copper Tube weight calculation formula

Copper Tube

• Formula: (OD-wall thickness)×thickness(mm)×length(m)×0.02796

Aluminum Embossed Sheet weight calculation formula

Aluminum Embossed Sheet

• Formula: length(m)×width(mm)×thickness (mm)×0.00296

Brass Plate weight calculation formula

Brass Tube

• Formula: thickness(mm)×(O.D-thickness)×length(m)×0.0267

Copper Sheet weight calculation formula

Copper Sheet

• Formula: length(m)×width(mm)×thickness(mm)×0.0089

Zinc Plate weight calculation formula

Zinc Plate

• Formula: length(m)×width(mm)×thickness(mm)×0.0072

Lead Plate weight calculation formula

Lead Sheet

• Formula: length(m)×width(mm)×thickness(mm)×0.01137

Octagonal Steel

Octagonal Steel

• Formula: length(m)×across width(mm)×across width(mm)×0.0065

Copper Rod

• Formula: dia.(mm)×dia.(mm)×length(m)×0.00698

Round Brass Rod

Brass Rod

• Formula: dia.(mm)×dia.(mm)×length(m)×0.00668

Round Aluminum Rod

Aluminum Rod

• Formula: dia.(mm)×dia.(mm)×length(m)×0.0022

Square Copper Rod

Square Copper Rod

• Formula: width(mm)×width(mm)×length(m)×0.0089

Square Brass Rod

Square Brass Rod

• Formula: width(mm)×width(mm)×length(m)×0.0085

Square Aluminum Rod

Square Aluminum Rod

• Formula: width(mm)×width(mm)×length(m)×0.0028

Hexagonal Copper Rod

Hexagonal Copper Rod

• Formula: across width(mm)×across width(mm)×length(m)×0.0077

Hexagonal Brass Rod

Hexagonal Brass Rod

• Formula: width(mm)×across width(mm)×length(m)×0.00736

Hexagonal Aluminum Rod

Hexagonal Aluminum Rod

• Formula: across width(mm)×across width(mm)×length(m)×0.00242

Aluminum Plate


• Formula: thickness(mm)×width(mm)×length(m)×0.00171

Round Aluminum Tube

Aluminum Tube

• Formula: thickness(mm)×(O.D(mm)-thickness(mm))×length(m)×0.00879

411 thoughts on “Theoretical Metal Weight Calculation Formula (30 Types of Metals)”

  1. 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.

    1. Ajay Kumar Shaw

      It is very helpful for cost estimation for people like me in the procurement . please share a copy of it PDF .

  2. 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…

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

    1. 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.

  3. 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.

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

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

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