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Steel Weight Calculation

Steel Weight Calculation

What is Steel Weight Calculation?

Steel Weight Calculation is a crucial process in various industries, including construction, manufacturing, and engineering, where precise measurements are essential. Understanding the weight of steel is vital for ensuring the structural integrity, cost estimation, and material management of a project.

The steel weight formula helps in calculating the unit weight of steel, which refers to the weight per unit volume. This is often necessary for ordering the right amount of material, transporting it, and incorporating it into designs accurately.

Unit Weight of Steel

The unit weight of steel is typically measured in kilograms per cubic meter (kg/m³) or pounds per cubic foot (lb/ft³). Steel has a unit wt of steel of approximately 7850 kg/m³. Knowing this value helps in determining the total weight for different shapes and sizes of steel.

Steel Weight Formula

To find the weight of steel, you can use specific formulas based on the shape of the steel component. Here are some common formulas:

Steel Bars Weight Calculation

For steel bars, the weight of steel bars formula is:

Alternatively, a simplified version often used in practice for round bars is:

practice for round bars

This formula assumes the unit weight of steel is constant and incorporates it directly for ease of calculation.

Steel Plates Weight Calculation

For steel plates, the formula is:

Weight (kg)= Length (m) × Width (m) × Thickness (m) × Unit Weight of Steel (kg/m³)

Steel Pipes Weight Calculation

For steel pipes, you can use:

Weight (kg) = π × (Outer Diameter (m) − Wall Thickness (m)) × Wall Thickness (m) × Length (m) × Unit Weight of Steel (kg/m³)

Steel Weight Calculation Table

To make the Steel Weight Calculation process easier, here is a reference table with standard sizes and their corresponding weights.

ShapeFormulaExample Calculation
Round BarsWeight (kg) – Length (m) Diameter (mm) 162For a bar 12m long and 16mm diameter: Weight = 12 – 19.05 kg
PlatesWeight (kg) = Length (m) Width (m) Thickness (m) Unit Weight of Steel (kg/m3)For a plate 2m x 1m x 0.01m: Weight – 2 1 x 0.01 7850 – 157 kg
PipesWeight (kg) = IT (Outer Diameter (m) – Wall Thickness (m)) Wall Thickness (m) Length (m) Unit Weight of Steel (kg/m3)For a pipe 3m long 0.1m outer diameter, and 0.01m wall thickness: Weight – = (0.1 – 0.01) 0.01 3 7850 = 66.1 kg


Understanding Steel Weight Calculation is essential for anyone working with steel in construction or manufacturing. By using the correct steel weight formula and knowing the unit weight of steel, you can ensure that your projects are accurate, cost-effective, and safe. Whether you are calculating the weight of steel bars or the total steel weight for larger components, these formulas and tables provide a reliable reference.


The formula to calculate the weight of a steel bar is W=D2×L162W = \frac{{D^2 \times L}}{162}W=162D2×L​, where WWW is the weight in pounds, DDD is the diameter in inches, and LLL is the length in feet.

The formula for weight W=mgW = mgW=mg calculates the force exerted by gravity on an object, where WWW is the weight, mmm is the mass of the object, and ggg is the acceleration due to gravity.

The formula for calculating ideal body weight (IBW) is: Men: IBW (kgs) = 22 × (height in meters)^2. Women: IBW (kgs) = 22 × (height in meters − 10 cm)^2.

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