Calculate Steel Weight for 30 Metals: Formula & Calculator

I. Weight Calculation Formula

(1) Density-Based Formula

The following weight calculation formula can be used to calculate the steel/metal weight:

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

Above is the formula to calculate the steel weight in kg.

Calculate Steel & Metal Weight

Determination of Density

For the metal density, you can also refer to the following:

II. Steel & Metal Weight Calculator

To assist you in calculating the weight of various metals and steels, including MS plate, GI sheet, structural steel, MS angle, mild steel, steel bar, square tube, angle, and aluminum, we have created a Steel Weight Calculator and Metal Weight Calculator to help you determine the weight of metals in different shapes.

III. Metal & Steel Weight Calculation Formula

The unit of measurement for calculating the theoretical weight of steel is kilograms (kg). The basic formula is:

W (Weight, kg) = F (Cross-sectional Area, mm²) × L (Length, m) × ρ (Density, g/cm³) × 1/1000

The density of steel is: 7.85g/cm³

Simple Steel Weight Calculation Formulas

Simply enter data indicated (Decimal Inches), move from left to right making computations by factors as shown.

  • ROUND Diameter x Diameter x 2.6729 = Lbs. Per Foot 
  • FLAT Thickness x Width x 3.4032 = Lbs. Per Foot 
  • SQUARE Diameter x Diameter x 3.4032 = Lbs. Per Foot 
  • HEXAGON *Diameter x Diameter x 2.9437 = Lbs. Per Foot 
  • OCTAGON *Diameter x Diameter x 2.8193 = Lbs. Per Foot 
  • PIPE Actual O.D. – Wall x Wall x 10.68 = Lbs. Per Foot
  • TUBE O.D. – Wall  x Wall  x 10.68 = Lbs. Per Foot  
  • SHEET Thickness  x Width  x  Length  x  .2904 = Lbs. Each
  • COIL O.D. x O.D.  – I.D.  x I.D. x .2223 = Lbs. Per Inch of Width 
  • SHEET CIRCLE Diameter x  Diameter x  Thickness x  .228 = Lbs. Each
  • PLATE Thickness  x  Width  x  Length x  .2836 = Lbs. Each

PLATE SHAPES:

  • CIRCLE Diameter x  Diameter x  Thickness  x  .2227 = Lbs. Each
  • RING Diameter x Diameter – I.D. x I.D. x Thickness x .2227 = Lbs. Each
  • CIRCLE SECTOR    Radius x Radius x Number of Degrees in Arc x Thickness  x  .0025 = Lbs. Each
  • TRIANGLE (Right Angle) Base Length  x  Height  x Thickness  x  .1418 = Lbs. Each
  • TRAPEZOIDS (2 Sides Parallel) Side “A”  + Side “B”  x Height x Thickness  x 14.18 = Lbs.Each
  • HEXAGON (Equal Sides) Side Length  x  Side Length x  .7367 = Lbs. Each
  • OCTAGON Side Length  x  Side Length  x  1.3692 = Lbs. Each

NOTE: Formulas Are Based on Nominal Weights at .2836 Lbs. Per Cubic Inch and Should Be Considered Approximations Only Rather Than Actual Scale Weight

Weights of Various Metals in Pounds Per *Cubic Foot

Aluminum168.48Copper559.87
Antimony419.99Gold1206.83
Beryllium113.7Gun Metal (Aver.)544
Bismuth611Iridium1396
Brass (Approx.)535.68Iron491.09
Bronze, Alum.481Iron, Cast Grey442
Bronze (Approx.)541Iron,Wrought480
Cadmium540.86Iron, Slag172
Chromium428Lead707.96
Cobalt552.96Magnesium108.51
Manganese463.1Silver654.91
Mercury849Stainless Steel (18-8)494.21
Molybdenum637.63Steel, Cast/Rolled490
Monel Metal556Tin455.67
Nickel555.72Titanium283.39
Osmium1402Tungsten1204.41
Palladium712Vanadium374.97
Platinum1339.2Zinc445.3
Rhodium755*1728 CU. IN. PER CU. FT.
Ruthenium765
Steel Plate weight calculation formula

1. Steel Plate weight calculation formula

• 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 weight calculation formula

2. Steel Pipe weight calculation formula

• 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 weight calculation formula

3. Steel Rod weight calculation formula

• 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

4. Square Steel weight calculation formula

• 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 weight calculation formula

5. Flat Steel weight calculation formula

• 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 weight calculation formula

6. Hexagonal Steel weight calculation formula

• 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)

Rebar weight calculation formula

7. Rebar weight calculation formula

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

Flat Steel Tube weight calculation formula

8. Flat Steel Tube weight calculation formula

• 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

9. Rectangular Steel Tube weight calculation formula

• 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

10. Equal-leg Angle Steel weight calculation formula

• 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 weight calculation formula

11. Unequal-leg Angle Steel weight calculation formula

• 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 weight calculation formula

12. Brass Pipe weight calculation formula

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

Copper Pipe weight calculation formula

13. Copper Pipe weight calculation formula

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

Aluminum Checkered Sheet weight calculation formula

14. Aluminum Checkered Sheet weight calculation formula

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

Brass Pipe weight calculation formula

15. Brass Pipe weight calculation formula

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

Copper Sheet weight calculation formula

16. Copper Sheet weight calculation formula

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

Zinc Plate weight calculation formula

17. Zinc Plate weight calculation formula

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

Lead Sheet weight calculation formula

18. Lead Sheet weight calculation formula

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

Octagonal Steel weight calculation formula

19. Octagonal Steel weight calculation formula

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

Copper Rod weight calculation formula

20. Copper Rod weight calculation formula

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

Brass Rod weight calculation formula

21. Brass Rod weight calculation formula

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

Aluminum Rod weight calculation formula

22. Aluminum Rod weight calculation formula

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

Square Copper Rod weight calculation formula

23. Square Copper Rod weight calculation formula

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

Square Brass Rod weight calculation formula

24. Square Brass Rod weight calculation formula

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

Square Aluminum Rod weight calculation formula

25. Square Aluminum Rod weight calculation formula

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

Hexagonal Copper Rod weight calculation formula

26. Hexagonal Copper Rod weight calculation formula

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

Hexagonal Brass Rod weight calculation formula

27. Hexagonal Brass Rod weight calculation formula

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

Hexagonal Aluminum Rod weight calculation formula

28. Hexagonal Aluminum Rod weight calculation formula

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

Aluminum Plate weight calculation formula

29. Aluminum Plate weight calculation formula

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

Aluminum Pipe weight calculation formula

30. Aluminum Pipe weight calculation formula

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

Download PDF:

  • Steel weight calculation formula PDF

Common sources of error in the calculation of metal material weight

Common sources of error in the weight calculation of metal materials include the following points:

Accuracy of Density: The density of metal materials is one of the key factors affecting the calculation of their theoretical weight. If the density value is inaccurate, it will lead to a large error in the calculated weight.

Dimensional Deviation: There may be a deviation between the actual size and theoretical size of metal materials, which can affect the weight calculation. For instance, seamless steel pipes are allowed a certain range of deviation in their external diameter and wall thickness, while the maximum permissible error for the actual weight of standard I-beams is between +3% and -5%.

Influence of Thermal Expansion Coefficient: Materials expand when heated, and different materials have different thermal expansion coefficients. This can result in errors when measuring or calculating weight in high-temperature environments.

Difference between Theoretical and Actual Weight: Even under ideal conditions, there is a certain range of error in the theoretical weight calculation method. For example, the error between the theoretical weight mentioned by the calculator and the actual weight is approximately 0.2%-0.7%.

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Shane
Author

Shane

Founder of MachineMFG

As the founder of MachineMFG, I have dedicated over a decade of my career to the metalworking industry. My extensive experience has allowed me to become an expert in the fields of sheet metal fabrication, machining, mechanical engineering, and machine tools for metals. I am constantly thinking, reading, and writing about these subjects, constantly striving to stay at the forefront of my field. Let my knowledge and expertise be an asset to your business.

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