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Calculating the weight per meter of steel rebar is essential for construction projects, material procurement, and structural design. This calculator provides an accurate way to determine the weight of rebar based on its diameter and length.

What is rebar weight per meter?

Rebar weight per meter refers to the mass of a steel reinforcement bar per linear meter. This measurement is crucial for engineers and construction professionals to estimate material requirements, transportation needs, and structural calculations.

The weight varies depending on the rebar diameter and the specific type of steel used. Standard rebar is typically made of carbon steel, with a density of approximately 7850 kg/m³ (7.85 g/cm³).

How to calculate rebar weight per meter

The weight of a rebar per meter can be calculated using the following formula:

Weight (kg/m) = (π × (Diameter/2)² × Length × Density) / 1000

Where:

Diameter is the diameter of the rebar in millimeters
Length is the length of the rebar in meters (typically 1 meter for this calculation)
Density is the density of the steel (7850 kg/m³ for standard rebar)

The result is divided by 1000 to convert from grams to kilograms.

Important Note

This calculation provides an estimate. Actual rebar weights may vary slightly due to manufacturing tolerances and surface conditions.

Common rebar sizes and weights

Rebar comes in standard diameters ranging from 6mm to 40mm. Here are the approximate weights per meter for common sizes:

Diameter (mm)	Weight per meter (kg)
6	0.22
8	0.39
10	0.61
12	0.85
16	1.58
20	2.47
25	3.85
32	6.31
40	9.87

These values are based on standard carbon steel with a density of 7850 kg/m³.

Applications of rebar weight calculation

Knowing the weight per meter of rebar is important for several construction applications:

Material procurement: Helps estimate the amount of rebar needed for a project
Transportation planning: Assists in determining the number of rebar loads required
Structural design: Provides data for load calculations and reinforcement design
Cost estimation: Aids in budgeting for steel reinforcement materials

Accurate weight calculations ensure efficient material handling and proper structural integrity.

FAQ

What is the standard density of rebar steel?

Standard carbon steel rebar has a density of approximately 7850 kg/m³ (7.85 g/cm³).

How does rebar diameter affect its weight?

The weight of rebar increases with the square of its diameter. A 20mm rebar weighs about 2.47 kg per meter, while a 40mm rebar weighs about 9.87 kg per meter.

Why is rebar weight important in construction?

Rebar weight is important for material planning, transportation, structural calculations, and cost estimation in construction projects.

Can rebar weight vary between manufacturers?

Yes, rebar weight can vary slightly between manufacturers due to manufacturing tolerances and surface conditions, even though the diameter is the same.