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.
Determination of Density
For the metal density, you can also refer to the following:
- Density Table of Metals (Iron, Steel, Brass, Aluminum) and Alloys
- Density Table for Commonly Used Sheet Metal Materials
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
Aluminum | 168.48 | Copper | 559.87 |
Antimony | 419.99 | Gold | 1206.83 |
Beryllium | 113.7 | Gun Metal (Aver.) | 544 |
Bismuth | 611 | Iridium | 1396 |
Brass (Approx.) | 535.68 | Iron | 491.09 |
Bronze, Alum. | 481 | Iron, Cast Grey | 442 |
Bronze (Approx.) | 541 | Iron,Wrought | 480 |
Cadmium | 540.86 | Iron, Slag | 172 |
Chromium | 428 | Lead | 707.96 |
Cobalt | 552.96 | Magnesium | 108.51 |
Manganese | 463.1 | Silver | 654.91 |
Mercury | 849 | Stainless Steel (18-8) | 494.21 |
Molybdenum | 637.63 | Steel, Cast/Rolled | 490 |
Monel Metal | 556 | Tin | 455.67 |
Nickel | 555.72 | Titanium | 283.39 |
Osmium | 1402 | Tungsten | 1204.41 |
Palladium | 712 | Vanadium | 374.97 |
Platinum | 1339.2 | Zinc | 445.3 |
Rhodium | 755 | *1728 CU. IN. PER CU. FT. | |
Ruthenium | 765 |
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
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
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
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)
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)
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)
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
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
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
12. Brass Pipe weight calculation formula
• Formula: (OD-wall thickness)×thickness(mm)×length(m)×0.0267
13. Copper Pipe weight calculation formula
• Formula: (OD-wall thickness)×thickness(mm)×length(m)×0.02796
14. Aluminum Checkered Sheet weight calculation formula
• Formula: length(m)×width(mm)×thickness (mm)×0.00296
15. Brass Pipe weight calculation formula
• Formula: length(m)×width(mm)×thickness(mm)×0.0085
16. Copper Sheet weight calculation formula
• Formula: length(m)×width(mm)×thickness(mm)×0.0089
17. Zinc Plate weight calculation formula
• Formula: length(m)×width(mm)×thickness(mm)×0.0072
18. Lead Sheet weight calculation formula
• Formula: length(m)×width(mm)×thickness(mm)×0.01137
19. Octagonal Steel weight calculation formula
• Formula: length(m)×across width(mm)×across width(mm)×0.0065
20. Copper Rod weight calculation formula
• Formula: dia.(mm)×dia.(mm)×length(m)×0.00698
21. Brass Rod weight calculation formula
• Formula: dia.(mm)×dia.(mm)×length(m)×0.00668
22. Aluminum Rod weight calculation formula
• Formula: dia.(mm)×dia.(mm)×length(m)×0.0022
23. Square Copper Rod weight calculation formula
• Formula: width(mm)×width(mm)×length(m)×0.0089
24. Square Brass Rod weight calculation formula
• Formula: width(mm)×width(mm)×length(m)×0.0085
25. Square Aluminum Rod weight calculation formula
• Formula: width(mm)×width(mm)×length(m)×0.0028
26. Hexagonal Copper Rod weight calculation formula
• Formula: across width(mm)×across width(mm)×length(m)×0.0077
27. Hexagonal Brass Rod weight calculation formula
• Formula: width(mm)×across width(mm)×length(m)×0.00736
28. Hexagonal Aluminum Rod weight calculation formula
• Formula: across width(mm)×across width(mm)×length(m)×0.00242
29. Aluminum Plate weight calculation formula
• Formula: thickness(mm)×width(mm)×length(m)×0.00171
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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First of, Great Article
Also can i have calculations of H Beams as well… can u please email me pdf copy on [email protected] of the same
check this tool: http://www.machinemfg.com/h-i-beam-weight-calculator/
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