Weight formula for steel

Weight formula for steel

Accurate calculation of steel weight is crucial in construction projects, as it ensures structural integrity and safety. Proper weight estimation helps prevent overloading, which can lead to structural failure. By using the correct formulas, manual measurement errors are minimized, reducing the risk of costly mistakes.

Table of contents

  • Steel Bar Weight Chart
  • Weight Chart of Bars per Bundle
  • Steel Plate Weight Chart
  • Weight of Steel Bars Formula
  • Steel Unit Weight Per Kg
  • Factors Influencing Steel Beams Weight Calculation
  • Steel Pipes Weight Formula
  • Steel Bars Tolerance
  • Steel Types and its Density
  • Steel Weight in Feet

Calculate bars and plate weight using formula

The table below provides accurate weight values for different steel sizes, making it easier to estimate materials for your project.

Steel Bar Weight Chart

Size MM   8 10 12 16
BIS Standard KG/MTR. min 0.367 0.574 0.844 1.501
avg 0.395 0.617 0.888 1.58
max 0.423 0.66 0.932 1.659
Values Kg/Mtr.   0.375 to 0.400 0.580 to 0.620 0.850 to 0.910 1.510 to 1.600
Size MM 20 25 28 32
BIS Standard KG/MTR. 2.396 3.734 4.685 6.121
2.47 3.856 4.83 6.31
2.544 3.964 4.975 6.499
Values Kg/Mtr. 2.400 to 2.510 3.750 to 3.910 4.700 to 4.900 6.184 to 6.436

Weight Chart of Bars per Bundle

Steel Bar Size (mm) 8 10 12 16 20 25 28 32
Steel Bar pieces per bundle (No.s) 10 7 5 3 2 1 1 1
Length of Steel Bar (M) 12 12 12 12 12 12 12 12
Total Weight of Steel Bar bundle (Kg) 45 48.72 51 54.36 57.6 45 56.4 74.21

Steel Plate Weight Chart

Plate Thickness (mm) 1.6 2 2.5 3 3.2 4 5 6 8 10 12.5 15 20 22.5 25 30 32 35 40
Weight (kg/m2) 12.6 15.7 19.6 23.6 25.1 31.4 39.3 47.1 62.8 78.5 98.1 118 157 177 196 236 251 275 314
Plate Thickness (mm) 45 50 55 60 65 70 75 80 90 100 110 120 130 150 160 180 200 250
Weight (kg/m2) 353 393 432 471 510 550 589 628 707 785 864 942 1051 1178 1256 1413 1570 1963

Check the formula to calculate weight of steel

Weight of Steel Bars Formula

Weight of Steel Bars Formula

Steel Bars Weight = D²/162

Where,
D = Diameter
162 is a constant value

D2/162 Formula Derivation
Consider,
Diameter = D
Length = L

Weight of Steel Bar (W) = Unit Weight of Steel Bar (γ) x Volume (V)

W = γ x V
W = πD²/4 x γ (V = πD²/4)

7850 kg/m3 (γ) = Steel unit weight

W = πD²/4 x 7850
steel dia in mm
density = kg/m3

Steel diameter in mm will be converted to m to create a constant value in the same unit

D² mm / 1000²
W = π/4 x D²/1000² x 7850
W = D²/162.28 kg/m
W = D²/162 kg/m

Refer unit weight of steel per kg

The following table shows the weight of steel per meter, which is useful for various applications.

Steel Unit Weight Per Kg

Unit Weight Of Steel
Size 6 mm 8 mm 10 mm 12 mm 16 mm 20 mm 25 mm 32 mm
Kg/m 0.222 kg 0.395 kg 0.617 kg 0.89 kg 1.58 kg 2.47 kg 3.86 kg 6.32 kg
View the factors which influence weight calculation of Steel Beams

Factors Influencing Steel Beams Weight Calculation

1] Beam Size and Shapes

  • Dimension: thickness, width and Height
  • Cross-Sectional Shape: U-beams, H-beams, I-beams etc

2] Beam Length

  • If there is no change in the cross-sectional area, longer beams weigh more than shorter ones

3] Steel Grade and Density:

  • Steel Type
  • Beams made of higher density steel weigh more.

4] Additional Load

  • Dead Loads: non-moving loads, Permanent load
  • Live Loads: Temporary and varying loads

5] Connections and Joints

  • The total weight is affected by the type and quantity of joints and connections
Steel Beams
Calculate the weight of steel pipes using below formula

Steel Pipes Weight Formula

Steel Pipes Weight Formula

Steel pipes = W = 0.02466 x D^2 x L / 10202

Where,

W = steel pipe weight in kg/m
D = steel pipe OD in mm
L = steel pipe length in m

Eg:
Consider,
steel pipe OD (D)= 100 mm, length (L) = 6m
W = 0.02466 x 100^2 x 6 / 10202
W = 0.02466 x 10000 x 6 / 10202
W = 1480 / 10202
W = 0.145 kg/m

Steel Bars Tolerance

Nominal Size (mm)   Over 10 upto and including 16 Up to and including 10 Over 16
Tolerance On Batch ± 5 ± 7 ± 3
The Nominal Individual Sample -6 -8 -4
Mass, Percent Individual Samples for Coils Only ± 6 ± 8 ± 4

Steel Types and its Density

Steel type Carbon steel Tool steel Wrought iron Carbon tool steel Cold-drawn steel
Density (kg/m³) 7840 7715 7750 7820 7830
Steel type C1020 HR steel Pure iron Mild steel Stainless steel
Density (kg/m³) 7850 7860 7870 8030

Steel Weight in Feet

Size 6 mm 8 mm 10 mm 12 mm 16 mm 20 mm 25 mm 32 mm
Kg/feet 0.067 kg 0.120kg 0.188 kg 0.270 kg 0.480 kg 0.751 kg 1.174 kg 1.925 kg

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