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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 steel bars weight chart in kgs for TMT bars, MS bars, deformed bars and more.
TMT bar weight chart
| Diameter | Weight of a single bar | Number of bars in a bundle | Unit weight of the steel per metre | No. of bars in a ton | Weight of bundle | No. of bundle in tons |
| 8mm | 4.74kg | 10 | 0.400 kg | 211 | 47 | 21 |
| 10 mm | 7.41kg | 7 | 0.618 kg | 135 | 52 | 19 |
| 12 mm | 10.67 kg | 5 | 0.890 | 94 | 53 | 19 |
| 16mm | 18.96 kg | 3 | 1.59kg | 53 | 57 | 18 |
| 20 mm | 29.63 kg | 2 | 2 .47kg | 34 | 59 | 17 |
| 25 mm | 46.30 kg | 1 | 3.86kg | 22 | 46 | 22 |
*For reference only. Please check with your steel seller for precise sizes, weight and other details.
MS round bars weight chart
| Size in mm | Weight (Kg/feet) | Weight (Kg/m) |
| 8mm | 0.120 | 0.395 |
| 10mm | 0.188 | 0.615 |
| 12mm | 0.270 | 0.890 |
| 14mm | 0.369 | 1.210 |
| 16mm | 0.480 | 1.580 |
| 20mm | 0.753 | 2.470 |
*For reference only. Please check with your steel seller for precise sizes, weight and other details.
Deformed reinforcing steel bars weight chart
| Size in mm | Weight (Kg/feet) | Weight (Kg/m) |
| 8mm | 0.120 | 0.395 |
| 10mm | 0.190 | 0.60 |
| 12mm | 0.271 | 0.90 |
| 14mm | 0.370 | 1.20 |
| 16mm | 0.480 | 1.58 |
| 20mm | 0.750 | 2.48 |
*For reference only. Please check with your steel seller for precise sizes, weight and other details.
Hot-rolled steel bars weight chart
| Size | Diameter (mm) | Weight (kg/m) | Diameter (D,mm) | Weight (kg/m) | Weight (Kg/mm) | Diameter (D,mm) | Weight (kg/mm) |
| 8 mm | 30 | 0,40 | 90 | 5,55 | 49,95 | 190 | 222,6 |
| 10 mm | 32 | 0,62 | 95 | 6,30 | 55,64 | 200 | 246,6 |
| 12 mm | 39 | 0,90 | 105 | 8,9 | 6,97 | 220 | 299,30 |
| 14 mm | 42 | 1,20 | 115 | 10,90 | 81,55 | 235 | 340 |
| 16 mm | 48 | 1,60 | 125 | 14,20 | 97,34 | 250 | 386,15 |
| 20 mm | 65 | 2,47 | 145 | 26,05 | 130,11 | 290 | 520 |
*For reference only. Please check with your steel seller for precise sizes, weight and other details.
What is the unit weight of steel bars?
What is unit weight of steel bar meaning? 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 unit weight of the steel bar to its unit volume. The unit of this ratio is kg/m. This defines the weight of 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 material.
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 its 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)
Now let’s understand this through an example.
Steps to calculate unit weight of steel bars
Step 1: Define the dimensions of the steel TMT bar (or any other)
First, you will have to know the dimensions of the steel TMT bar.
Steel bars come in various sizes, which refers to the diameter of the bar which is:
8 mm, 10 mm, 12 mm, 16 mm, 20 mm, 25 mm, 32 mm and 36 mm.
Here, diameter is the end-to-end measurement of the circular face of the bar.
For our calculation, here are the steel bar sizes:
Length = 10 m
Diameter = 12 mm
Radius = 6 mm or 0.006 m (half the diameter)
Step 2: Calculate the area of the cross section
Formula to calculate area of the cross-section is: πr²
Here, π = 3.1416 (standard)
Area of circle = πr²
= 3.1416 x (0.006 m) x (0.006 m)
= 0.000113 m²
Step 3: Find Volume per meter
Since weight is being calculated per meter, we need to find the volume per meter for area of cross section.
Since Length is 10 meters,
Volume = Area x Length
= 0.000113 m² x 10 m = 0.00113 m³
Step 4: Calculate total weight of the bar
Weight = Volume x Density
= 0.00113 m³ x 7850 kg/m³
= 8.88 kg
This explains how you can calculate the weight of steel bars for your projects.
Unit steel bar weight chart sample
Based on the formula above, here’s a sample weight chart for steel bars of 12-meter length and 8-meter length
| Diameter | Radius | Unit weight in kg (for 8m steel bar) | Unit weight in kg (for 12 m steel bar) |
| 8 mm | 4 mm | 3.16 kg | 4.74 kg |
| 10 mm | 5 mm | 4.93 kg | 7.40 kg |
| 12 mm | 6 mm | 7.10 kg | 10.65 kg |
| 16 mm | 8 mm | 12.63 kg | 18.94 kg |
| 20 mm | 10 mm | 19.73 kg | 29.59 kg |
| 22 mm | 11 mm | 23.87 kg | 35.81 kg |
| 25 mm | 12.5 mm | 30.83 kg | 46.24 kg |
| 32 mm | 16 mm | 50.51 kg | 75.76 kg |
*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 Indian Standard code:
| 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 |
| 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.
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.
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.
Having a weight chart available is helpful for estimating material needs and costs during project planning. The comparison of TMT, MS round, deformed reinforcing, and hot-rolled steel bars is really useful. Would like to know if there are standard length options available for each bar diameter.
aniketkumarak1272454@gmail.com
I’m building a small residential house. What type and size of steel bar would typically be recommended for the foundation and the walls?
Where you’re based? I have construction company from Rohtak. You can use TMT bars for foundation and steel as they are very strong. Generally, TMT bars with diameters of 10mm, 12mm, or 16mm are used for foundations. I can give you contact of structural engineer who can help you with this.
This chart is helpful. taken a print of this and kept on my desk under the glass 🙂
Calculating steel bar weight is now easy for me. Also creating an excel format for my team which can use it on day to day basis.
For anyone involved in construction or manufacturing, having a reference like this is crucial for accurate material planning and cost estimation. The detailed breakdown of different steel bar sizes and their corresponding weights helps streamline the procurement process, ensuring that there’s no overestimation or underestimation of the materials required.
Much appreciated for this weight chart and formula.
I stand with you bro
During procurement, this is very important for everyone. I have experienced that Weight Calculation of TMT bars and steel products set base for the negotiation on the price also. Higher quantity and higher weight will bring the per kg cost down.
Yes it sets a base for negotiation. But this weight chart will always help in pre-plan procurement and will give you a tentative idea of amount required for order placement.
Understanding the weight of steel bars is essential for effective project planning and budgeting in construction. Different types, like TMT and deformed bars, serve unique purposes, making a weight chart a vital tool for professionals. Knowing how to calculate unit weight aids in resource allocation and cost estimation, ensuring projects run smoothly and efficiently.
This is extremely useful. I have been trying to solve this for days until I stumbled on this page. Thank you so much.