Calculate Rebar Weight with Our FREE Chart & Calculator

Are you tired of manually calculating the weight of rebar for your construction project?

Look no further than our comprehensive rebar weight chart and calculator!

Our easy-to-use tool provides you with the weight of different types of rebar, from Φ6 to Φ50, as well as MS HR round wire rod and steel strand for prestressed concrete.

Whether you’re a seasoned engineer or a DIY enthusiast, our rebar weight chart and calculator will help you make informed decisions about your construction project.

But that’s not all – our guide also covers everything you need to know about rebar, from its different grades and classifications to its various applications and specifications.

Discover the key to building strong and sustainable structures that stand the test of time with our ultimate guide to rebar.

So what are you waiting for? Check out our rebar weight chart and calculator today and take the first step towards a successful construction project!

What Is Rebar?

Rebar, also known as ribbed steel bar, encompasses both hot-rolled and cold-rolled ribbed steel bars.

The grade of rebar is denoted by HRB, followed by its minimum yield point, and is divided into three categories: HRB335, HRB400, and HRB500.

For seismic reinforcement, an “E” is added to the ordinary reinforcement, such as HRB400E.

Note that the density of the billet used for rebar rolling is consistent at 7.85g/cm³, and thus, the theoretical weight of rebars of the same specifications will be the same, regardless of the rolling method or grade.

You can easily determine the weight of rebar steel through either our rebar weight calculator or by using the chart provided below.

Rebar Weight Fundamentals

Material Composition

When it comes to rebar weight, you need to consider the material composition. Rebar is short for “reinforcing bar,” and it is primarily made from steel. Steel is an alloy of iron and carbon, with trace amounts of other elements, such as manganese, silicon, and phosphorus. The weight of rebar is dependent on the density of the steel, which is typically around 7,850 kg/m³.

Rebar Types

In addition to material composition, the type of rebar also affects its weight. There are several types of rebar that you can use in a construction project. Below are some common rebar types:

  1. Carbon Steel Rebar: This is the most common type of rebar and has a relatively high tensile strength. Carbon steel rebar comes in various grades and diameters, each with a different weight.
  2. Welded Wire Fabric (WWF): This type of rebar looks like a mesh made of steel wires welded at each intersection. It is mainly used for reinforcing slabs and walls. WWF is available in different wire diameters, spacings, and weights.
  3. Epoxy-Coated Rebar: This is a carbon steel rebar coated with epoxy to resist corrosion. It is often used in structures exposed to harsh environmental conditions, such as bridges and marine applications.
  4. Stainless Steel Rebar: This type of rebar is known for its high resistance to corrosion and its ability to maintain structural integrity over time. It is heavier than carbon steel rebar, but it is also more expensive.

To calculate the weight of a specific type and length of rebar, you can use the following formula:

Weight = Length × Diameter² × 0.00617

Where Weight is in kilograms, Length is in meters, and Diameter is in millimeters. The factor 0.00617 is a constant derived from the density of steel and the conversion factor between square millimeters and square meters.

Here’s a brief example:

If you have a 12-meter long, 16-millimeter diameter carbon steel rebar, you can calculate its weight using the formula:

Weight = 12 × 16² × 0.00617 = 18.95 kg

By understanding rebar weight fundamentals, such as material composition and different rebar types, you can make informed decisions about the right type of rebar for your construction project.

Rebar Weight Calculator

Rebar Weight Chart

MS HR round wire rodΦ5.5kg/m0.187
MS HR round wire rodΦ6.0kg/m0.222
MS HR round wire rodΦ6.5kg/m0.26
MS HR round wire rodΦ7.0kg/m0.3019
MS HR round wire rodΦ7.5kg/m0.3469
Steel Strand for Prestressed Concrete(1×2)10kg/km310
Steel Strand for Prestressed Concrete(1×2)12kg/km447
Steel Strand for Prestressed Concrete(1×3)10.8kg/km465
Steel Strand for Prestressed Concrete(1×3)12.9kg/km671
Steel Strand for Prestressed Concrete(1×7)Standard9.5kg/km432
Steel Strand for Prestressed Concrete(1×7)Standard11.1kg/km580
Steel Strand for Prestressed Concrete(1×7)Standard12.7kg/km774
Steel Strand for Prestressed Concrete(1×7)Standard15.2kg/km1101
Steel Strand for Prestressed Concrete(1×7)Drawing Type12.7kg/km890
Steel Strand for Prestressed Concrete(1×7)Drawing Type15.2kg/km1295
Indented wire5kg/km0.016


(1) Theoretical weight calculation formula of rebar: theoretical weight (kg/m) = 0.00617 × D² (where, D is the section diameter, unit: mm)
(2) The density is calculated as 7.85g/cm³;
(3) The theoretical weight of hot-rolled ribbed bars, cold-rolled ribbed bars, HRB335, HRB400, HRB500 and other deformed bars of different classifications is the same.
(4) The theoretical weight calculated by the formula is different from the actual weight, and the error is generally about 0.2% ~ 0.7%, which can only be used as a reference for estimation.

Factors Affecting Rebar Weight

When considering the weight of rebar, several factors can influence its overall mass. In my experience, the most important factors include manufacturing variations and environmental factors. I’ll explain each of these briefly below.

Manufacturing Variations

In the production process of rebar, there might be certain variations that affect the weight of each piece. These can include:

  • Diameter: Rebar comes in various diameters, which significantly impacts the weight. Larger diameters have more material, and thus, are heavier.
  • Length: The longer the rebar, the more material it contains and the heavier it will be. Manufacturers cut rebar to different lengths, sometimes within a given shipment, which causes variation in weight.
  • Material: There are different types of steel used in the production of rebar. Some materials are denser and heavier, while others are lighter. The choice of material impacts the overall weight of the rebar.

Environmental Factors

Once the rebar leaves the manufacturing facility, several environmental factors can affect its weight:

  • Corrosion: Exposure to air, water, or other corrosive substances can cause rebar to rust, which adds to its weight. This is particularly important in areas with high humidity or when used in marine environments.
  • Debris: Along the rebar’s path from the manufacturer to the construction site, it may collect debris, like soil, dust, and grease. This added material increases the rebar’s weight.
  • Temperature: Lastly, temperature fluctuations can affect rebar’s weight. For example, when it’s cold, the steel contracts and its density increases. Conversely, when it’s hot, the steel expands and its density decreases.

I hope this gives you an idea of the factors affecting rebar weight. Always consider these when working on construction projects or estimating the total weight of a shipment of rebar.

Weight of Reinforcement With Common Specifications

(weight per meter)

For example:

  • Φ6=0.222Kg
  • Φ8=0.395Kg
  • Φ10=0.617Kg
  • Φ12=0.888Kg
  • Φ14=1.21Kg
  • Φ16=1.58Kg
  • Φ18=2Kg
  • Φ20=2.47Kg
  • Φ22=3Kg
  • Φ25=3.86Kg
  • Φ28=4.83Kg
  • Φ32=6.31Kg
  • Φ36=7.99Kg
  • Φ40=9.87Kg

Classification of Rebar

There are two common methods for classifying rebar:

Based on geometric shape: This classification takes into account the cross-rib section shape and rib spacing.

For instance, in the British Standard (BS4449), rebar is classified into Type I and Type II.

This classification primarily reflects the rebar’s grip performance.

Based on performance grade: The rebar is classified according to its strength grade (yield point/tensile strength), as specified by the current executive standard (GB1499.2-2007 wire rod 1499.1-2008) in our country. For example, it is classified into three grades.

In the Japanese Industrial Standard (JISG3112), rebar is divided into five categories based on comprehensive performance. The British Standard (BS4461) also defines several grades of rebar performance testing.

Rebar can also be classified based on its use, such as ordinary rebar for reinforced concrete, prestressed rebar, heat-treated rebar for concrete, etc.

Specification of Rebar

The specifications of rebar are typically required to be listed in import and export trade contracts.

Usually, the rebar specifications should include the standard grade, nominal diameter, nominal weight, specified length, and allowable differences of the above indicators.

The standard nominal diameters for rebar are 6, 8, 10, 12, 16, 20, 25, 32, 40, and 50mm.

The supplied length of rebar can be either fixed length or multiple lengths.

The range of fixed length for rebar exported from China is 6-12m, while that of rebar exported from Japan is 3.5-10m. If there is no requirement specified in the contract for domestic rebar, its length is usually 9m or 12m.

Application of Rebar

Rebar is widely used in civil engineering construction projects, including houses, bridges, and roads.

It is an indispensable structural material for various public facilities like highways, railways, bridges, culverts, tunnels, flood control, and dams, as well as for building foundations, beams, columns, walls, and slabs.

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