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Steel bars are a common element in construction and manufacturing projects. Strong and versatile, these bars come in various types such as TMT bars, Mild Steel bars, deformed bars, steel rebars, reinforced bars, each with its unique properties and applications.

Understanding the weight of steel bars, therefore, is crucial for project planning, budgeting, and procurement. Referring to a steel bar weight chart, therefore, can be an invaluable reference tool.

Further, for industry professionals, knowledge of steel bar weight in kg enables resource allocation and cost estimation. Here, let us take a look at how to calculate the unit weight of steel bars and what a steel bar weight chart looks like.

Disclaimer: The focus here is to understand the process of steel bar weight calculations and how to prepare a weight chart for reference. The dimensions used below are for reference only. All should consult with their steel manufacturer for exact dimensions and sizes for the weight calculation.

Steel Bar Weight Chart

Before we learn how to calculate the unit weight of steel bars, let’s take a look at the steel bars weight chart in kgs for TMT bars, MS bars, deformed bars, and more.

TMT Bar Weight Chart

(Updated: July 2025 | All weights in kg, length = 12m)

Diameter (mm) Weight of a single bar (12m) Number of bars in a bundle Unit weight per metre (kg/m) Number of bars in a ton Approx Price (₹/kg)
8 4.74 10 0.395 211 ₹47.9
10 7.41 10 0.617 135 ₹47.9
12 10.67 10 0.889 93 ₹47.9
16 18.96 5 1.580 52 ₹46.8
20 29.63 5 2.469 34 ₹46.8
25 46.30 2 3.858 22 ₹55.5
32 75.85 2 6.321 13 ₹55.5
36 96.00 1 8.000 10 ₹55.5

*For reference only. Please check with your steel seller for precise size, price, weight, and other details.

MS Round Bars Weight Chart

Weight Chart with Approximate Price (July 2025)

Size (mm) Weight (kg/ft) Weight (kg/m) Approx. Price (₹/kg)
8 mm 0.129 0.395 ₹46
10 mm 0.188 0.617 ₹46
12 mm 0.270 0.888 ₹46
14 mm 0.369 1.210 ₹45.5
16 mm 0.480 1.580 ₹45
20 mm 0.752 2.469 ₹45

*For reference only. Please check with your steel seller for precise size, price, weight, and other details.

Deformed Reinforcing Steel Bars Weight Chart

Weight Chart with Approximate Price (July 2025)

Size (mm) Weight (kg/ft) Weight (kg/m) Approx. Price (₹/kg)
8 mm 0.120 0.395 ₹47.9
10 mm 0.188 0.617 ₹47.9
12 mm 0.271 0.888 ₹47.9
14 mm 0.369 1.210 ₹47.9
16 mm 0.481 1.580 ₹46.8
20 mm 0.753 2.469 ₹46.8
25 mm 1.176 3.858 ₹55.5
28 mm 1.473 4.832 ₹55.5
32 mm 1.930 6.321 ₹55.5
36 mm 2.444 8.000 ₹55.5
40 mm 3.001 9.870 ₹55.5

*For reference only. Please check with your steel seller for precise size, price, weight, and other details.

Hot-Rolled Steel Bars Weight Chart

Weight Chart with Approximate Price (July 2025)

Size Diameter (mm) Weight (kg/m) Diameter (D, mm) Weight (kg/m) Weight (kg/mm) Diameter (D, mm) Weight (kg/mm) Approx. Price (₹/m)
8 mm 30 0.40 90 5.55 49.95 190 222.60 ₹21
10 mm 32 0.62 95 6.30 55.64 200 246.60 ₹32
12 mm 39 0.90 105 8.90 69.70 220 299.30 ₹47
14 mm 42 1.20 115 10.90 81.55 235 340.00 ₹62
16 mm 48 1.60 125 14.20 97.34 250 386.15 ₹78
20 mm 65 2.47 145 26.05 130.11 290 520.00 ₹96

*For reference only. Please check with your steel seller for precise size, price, weight, and other details.

What is the Unit Weight of Steel Bars?

What is the unit weight of a steel bar, and what does it mean? 

The unit weight of a bar is the weight per unit length of the bar. Therefore, the unit weight of a steel bar is the weight per unit length of the steel bar.

In other words, it is the ratio of the unit weight of the steel bar to its unit volume. The unit of this ratio is kg/m. This defines the weight of the steel bars formula as well.

Why is unit weight calculation important?

Load bearing, stability, and durability are important functions of the steel bars used in construction. Steel unit weight calculation is therefore important as it enables engineers to estimate how much or how many steel bars are required to fulfil the load-bearing capacity requirements and give the building its structural integrity.

It also helps businesses prevent the waste of raw materials.

measurement of steel bars weight

How to calculate the Unit Weight of Steel Bars?

Steel bars can be of a circular or rectangular cross-section. We will examine how to calculate the unit weight of steel round bars with a circular cross-section, as these are the most widely used.

The formula for calculating the unit weight is:

Weight = Volume x Density

  • Volume: For steel bars, volume is derived from their length (L) and cross-sectional area (A)
  • Cross-sectional area of the bar: Calculated as πr² (where ‘r’ is the radius and is half the diameter)
  • Density: 7850 kg/m³ (this figure is standard for calculations)

So, the full formula becomes:

Weight = (π × D² / 4) × L × 7850 × 10⁻⁶

Steps to calculate the unit weight of steel bars

Let’s look at a simple example to understand how to find the weight of a steel bar.

Step 1: Know the dimensions

Steel TMT bars come in standard diameters like 8 mm, 10 mm, 12 mm, 16 mm, etc.

Here, the diameter is the end-to-end measurement of the circular face of the bar.

In this example, we’ll use:

  • Length = 10 m
  • Diameter = 12 mm
  • Radius = 6 mm or 0.006 m (half the diameter)

Step 2: Calculate the cross-sectional area

Use the formula:

Area = πr²

= 3.1416 × (0.006)²

= 0.000113 m²

Step 3: Find the volume per meter

Volume = Area × Length

= 0.000113 × 10

= 0.00113 m³

Step 4: Calculate the total weight of the bar

Weight = Volume × Density

= 0.00113 × 7850

= 8.87 kg

So, a 12 mm steel bar of 10 m length weighs approximately 8.87 kg.

Indian person measuring the weight of various steel bar

Unit Steel Bar Weight Chart sample with Approx. Price (July 2025)

Based on the formula above, here’s a sample weight chart for steel bars of 12-meter length and 8-meter length.

Pricing Formula Used: Approx. Price = Weight (kg)×₹47.9

Unit Weight and Approx Price for 12mm Steel Bar

Radius Unit weight in kg  Approx. Price
4 mm 4.74 kg ₹227.45
5 mm 7.40 kg ₹354.46
6 mm 10.65 kg ₹510.54
8 mm 18.94 kg ₹907.63
10 mm 29.59 kg ₹1,416.44
11 mm 35.81 kg ₹1,714.35
12.5 mm 46.24 kg ₹2,215.90
16 mm 75.76 kg ₹3,627.89

*For reference and information only. Not exact. Please check with your steel manufacturer for actual dimensions and weight.

Grades and Sizes of Steel Bars as per Indian Standard Code

Given below are the nominal size groups of steel bars and steel wires, and their grades according to the Indian Standard code:

Table 1: Grouping of Steel Bars Based on Nominal Diameter (IS 1786:2008)

Group Size
Group I 4 mm, 5 mm, 6 mm
Group II 8 mm, 10 mm, 12 mm, 16 mm, 20 mm, 25 mm, 28 mm, 32 mm
Group III 36 mm, 40 mm, 45 mm, and 50 mm

Table 2: Grouping of Steel Bars Based on Strength Grade (IS 1786:2008)

Group Strength grade
Group 1 Fe 415, Fe 415D, Fe 415S
Group 2 Fe 500, Fe 500D, Fe 500S
Group 3 Fe 550, Fe 550D
Group 4 Fe 600
Group 5 Fe 650
Group 6 Fe 700

*Source: https://bis.gov.in/wp-content/uploads/2020/07/PM-IS-1786-JULY-2020-Revised-4.pdf

The weight of steel is generally measured in kilograms or tonnes. Construction projects usually source tonnes of steel bars as raw materials. Measuring the unit weight of steel bars is necessary to determine the load-bearing capacity of pillars, columns, etc.

Steel Bar Applications

Steel bars, particularly TMT bars, are the foundation of modern construction. Depending on their strength, ductility, and corrosion resistance, they are found in various forms, sizes, and applications throughout the industry. Here is where, and how, steel bars are typically used:

  • Buildings (residential and commercial): TMT bars are generally used to reinforce concrete beams, slabs, columns, and foundations. They hold buildings together in high-load scenarios, thermal changes, and earthquakes. Fe 500D and Fe 550D are two TSN commonly used in seismic zones due to their flexibility.
  • Bridges and flyovers: Bridges are subjected to dynamic loads and aggressive environmental conditions. Fe 600 and 700 high-strength steel bars offer high tensile strength and corrosion resistance, which are necessary to withstand longer spans of heavy loads in high-traffic conditions.
  • Roads: Steel bars are used in pavements, as well as retaining walls, in order to add structural strength. In highway structures, steel bars help to increase load-bearing capacity and reduce long-term maintenance requirements.
  • Dams and Water Retaining Structures: In dams, water tanks, and sewage systems, it is common to use steel bars to resist cracking as a result of the applied water pressures. The bonding strength of steel bars with concrete is even greater when a significant amount of moisture is present.
  • Industrial and Power Plants: Steel bars used in large-scale structures, such as factories, lots, and generating stations, are to be able to withstand large temperature changes and heavy mechanical loads. Steel bars create the load-bearing structure for columns, machinery beds, and high-load areas.


Disclaimer
: *This article is for information sharing only. The weight calculation process explained is for readers to understand how steel bars are weighted. Dimensions are for reference. Please consult with your steel supplier for exact dimensions, sizes, weight, and other details.

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FAQs

How heavy is a 12 mm TMT bar per meter?

A 12 mm tmt bar weighs 0.888 kg per metre (12² ÷ 162).

How many 8 mm TMT bars make one ton?

For 12 m bars, each weighs 4.74 kg. 1,000 kg ÷ 4.74 kg ≈ 211 bars per tonne.

What are the size groups of steel bars under IS 1786?

Group I: 4–6 mm, Group II: 8–32 mm, Group III: 36–50 mm

Which strength grades of TMT bars are available in India?

Grades range from Fe 415 up to Fe 700. (Fe 415 / 500 / 550 / 600 / 650 / 700, with D and S variants).

Is BIS certification compulsory for TMT bars in 2025?

Yes. Under the 2024 Quality‑Control Order, every TMT bar sold must carry a valid BIS mark.

Which TMT grade is best for residential buildings?

Fe 500D is widely preferred; it offers ductility for quake resistance and meets most building codes.

What density of steel should I use for weight calculations?

Use 7,850 kg/m³, the standard density for carbon‑steel bars.

What is the meaning of the unit weight of TMT bar?

The unit weight of a TMT bar is the weight per metre (kg/m) of a single steel rod. Common sizes range from 8 mm to 32 mm, and bars are usually purchased by weight (kg or tons) or number of pieces based on project needs.

What is the formula for steel weight calculation?

Steel weight is calculated using Weight = Volume × Density (7850 kg/m³)
Steel Type Weight Formula Example Dimensions Approx. Weight
TMT Bars π × r² × L × 7850 L = 12 m, r = 6 mm (0.006 m) ≈ 10.6 kg
Steel Beams L × W × H × 7850 L = 6 m, W = 0.1 m, H = 0.2 m 942 kg
Steel Sheets L × W × Thickness × 7850 L = 2 m, W = 1 m, T = 0.002 m 31.4 kg
Steel Pipes/Tubes π × (R² − r²) × L × 7850 L = 3 m, R = 0.05 m, r = 0.045 m ≈ 20.3 kg

What is the difference between Fe 500 and Fe 500D?

Fe 500D has higher ductility and lower carbon content, making it better for seismic zones and bending applications.

Sohini is a seasoned content writer with 12 years’ experience in developing marketing and business content across multiple formats. At Tata nexarc, she leverages her skills in crafting curated content on the Indian MSME sector, steel procurement, and logistics. In her personal time, she enjoys reading fiction and being up-to-date on trends in digital marketing and the Indian business ecosystem.