Steel Bar Weight Calculator

Explanation of above calculation

The weight of a steel bar must be calculated as part of any construction project. Whether you’re constructing a house, a bridge, or a skyscraper, understanding the weight of the steel bars you’ll need is critical for calculating the entire cost of the project. This is when the d2/162 formula comes into play.

The d2/162 formula is a quick and easy approach to compute the weight of a circular steel bar. But where does it originate? To understand how this formula was developed, we must first consider the cross-sectional area of a round steel bar. The cross-sectional area of a round bar is proportional to the square of its diameter and can be calculated as follows:

cross-sectional area of a round steel bar = π/4 x Diameter2

To calculate the weight of the steel bar, multiply the cross-sectional area by the length and density of the bar. Using the above cross-sectional area formula, we can write:

Weight = π/4 x Diameter2 x Length x Density

We can get the formula d2/162 by simplifying this expression. This formula is generated by dividing the original equation’s denominator by 4, then by 1000, and finally by replacing the value 162. As a result, the following formula is generated:

Weight = Diameter2 x Length / 162

Using this equation, we can determine the weight of a round steel bar by simply squaring its millimeter diameter, multiplying it by its meter length, and then dividing by 162. The steel bar’s weight in kilograms will be the outcome.

Example calculation

Consider the situation where you need to determine the weight of a steel bar with a 2 meter length and a 10 mm diameter. The following is the formula we can use to determine the weight:

Weight: (10x10x2) / (162) = 0.617 kg

The steel bar therefore weights 0.617 kg.

Weight of commonly used steel bars in the industry, calculated using the formula d2/162


Diameter (mm) Weight per meter (kg/m)
6 0.222
8 0.395
10 0.617
12 0.888
16 1.579
20 2.469
25 3.853
32 6.313
40 9.865
50 15.413
63 24.188
80 39.464
100 61.655


Let’s now examine the table above. The weight per meter of steel bars with various standard industry diameters is shown in the table below. You can observe that the weight rises as the bar’s diameter decreases. For instance, a steel bar with a diameter of 6 mm weighs only 0.222 kg/m, whereas a steel bar with a diameter of 100 mm weighs 61.655 kg/m.

You can quickly determine the weight of steel bars needed for your construction project using this table based on the required diameter and length of the bars. To calculate the overall weight, simply multiply the weight per meter by the meters the bar is long.

You should be aware that this table is predicated on the idea that the steel bars are composed of mild steel, which has a density of 7850 kg/m3. The weight could vary if the steel bars are constructed from a different kind of steel. The weight of various forms of steel bars, such as square, rectangular, or hexagonal bars, will be determined by separate weight formulas; this chart only displays the weight of round steel bars.


The weight of frequently used steel bars in the industry can be determined using the formula d2/162 and the table of weights per meter. With the aid of these tools, you can quickly determine the weight of steel bars for your construction project and make sure you have the necessary quantity of supplies.


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