Weight of Steel Rebar per Meter Chart (kg/m) & Formula Guide

Categories: Steel Rebar
Post by: Wellco Wholesale
Posted: November 21, 2025

In construction projects, knowing the weight of steel rebar per meter is crucial for accurate planning and procurement. This comprehensive guide provides a standard weight chart (ISO) to help you instantly find the weight of 6mm to 40mm rebar.

Standard Steel Rebar Weight Chart (per Meter)

Diameter (mm) Weight (kg/m) Weight (lbs/ft)
6 mm 0.222 0.149
8 mm 0.395 0.265
10 mm 0.617 0.415
12 mm 0.888 0.597
16 mm 1.580 1.062
20 mm 2.470 1.660
25 mm 3.850 2.587
32 mm 6.310 4.240
40 mm 9.860 6.626

 

1. What is Steel Rebar?

Steel rebar is a steel bar or mesh of steel wires used as a tension device in reinforced concrete and masonry structures. It strengthens and holds the concrete in compression, ensuring the structural integrity and durability of buildings, bridges, and other structures.

2. Standard Sizes of Rebar

Steel rebar comes in various sizes, typically ranging from 6mm to 40mm in diameter. Each size serves different purposes in construction:

  • 6mm to 12mm: Commonly used for light structures, such as sidewalks and small beams.
  • 16mm to 25mm: Typically used for medium to heavy structures, including slabs, columns, and beams.
  • 32mm to 40mm: Used in heavy construction, such as large-scale bridges and buildings.

3. Formula for Calculating Rebar Weight

The weight of steel rebar per meter is calculated using the standard formula:

Weight (kg/m) = D² / 162

Where:

  • W = Weight of rebar per meter (kg/m)
  • D = Diameter of rebar in millimeters (mm)
  • 162 = Constant derived from the density of steel (7850 kg/m³)

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For visual reference:

weight of steel rebar per meter formula

4. Example Calculations

If you are on the job site without internet, here is how to calculate it manually for a 12mm rebar:

  • Formula: D² / 162
  • Calculation: (12 x 12) / 162
  • 144 / 162 = 0.888 kg/m

5. Factors Affecting Rebar Weight

Several factors can influence the weight of steel rebar:

  • Density of Steel: Slight variations in steel composition can affect its density.
  • Diameter Accuracy: Manufacturing tolerances can result in minor differences in rebar diameter.
  • Length of Rebar: The total length needed for a project will impact the overall weight and cost.

6. Practical Applications

Accurately calculating the weight of steel rebar is essential for:

  • Project Planning: Ensuring the correct amount of rebar is ordered and delivered to the construction site.
  • Cost Estimation: Determining the material cost for budgeting purposes.
  • Structural Design: Verifying that the rebar meets the design specifications for strength and stability.

Conclusion

Understanding how to calculate the weight of steel rebar per meter is crucial for effective construction planning and execution. By using the provided formula and considering the factors that influence rebar weight, you can ensure accurate measurements and optimal resource utilization in your projects.