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

**Weight (kg) = Sectional Area (mm ^{2}) × Length (m) × Density (ρ, g/cm^{3})× 1/1000**

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

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

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.

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

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**

**P****L****A****TE**** ****SHAPES:**

**CIRCL****E****.222****7****=****Lb****s****.****Each****RIN****G****.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 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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Author

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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