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 online 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.

Then below steel weight calculator and metal weight calculator to calculate the weight of metals in various shapes will be helpful for you.

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

For the metal density, you can also refer to:

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

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:

Different Types of Metal 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 Pipe

• 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

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

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

Flat Steel

• Formula: side width(mm)×thickness(mm)×length(m)×0.00785
• E.g: 50mm(side width)×5.0mm(thickness)×6m(length)
• Calculation: 50×5×6×0.00785=11.775(kg)

Hexagonal Steel

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


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

Flat Steel Tube

• Formula: (side length+side 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

• Formula: side 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

• Formula: (side 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

• Formula: (side width+side 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 Pipe

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

Copper Pipe

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

Aluminum Checkered Sheet

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

Brass Pipe

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

Copper Sheet

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

Zinc Plate

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

Lead Sheet

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

Octagonal Steel

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

Copper Rod

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

Brass Rod

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

Aluminum Rod

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

Square Copper Rod

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

Square Brass Rod

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

Square Aluminum Rod

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

Hexagonal Copper Rod

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

Hexagonal Brass Rod

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

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

Aluminum Pipe

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

You can also download the infographic of the metal weight calculation formula (PDF file) on this page.

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

  1. Sir, if you could give me the Theoretical Metal Weight Calculation Formula (30 Types of Metals) in PDF of EXCEL it will be of much use for estimation.

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