Now you can easily calculate the weight of rebar used on construction site using this simple and advanced rebar weight calculator.
Rebar Calculator Use:
The procedure for using this calculator to calculate rebar weight is very simple. The steps to do so are as follows:
- There is no need to measure the dimensions of the rebar because standard sizes of rebars are available in market.
- Simply enter the rebar’s diameter and length as instructed by the structural engineer. Make sure to enter the bar’s diameter in millimetres.
- Skip the quantity field if you only want to calculate the weight of a single rebar.
- Enter the number of bars in the quantity field if you want to estimate the rebar weight in combos.
- The results will be displayed in kg and kg/m.
Standard Sizes & Weight of Rebar (Reinforcing Bars)
The standard sizes of reinforcing bars which are available in the market are as follows:
| Size of Bar (dia) | Weigth/Mass Per Meter (kg/m) | c/s Area (sq.mm) |
| 6 mm | 0.222 | 28.3 |
| 8 mm | 0.395 | 50.3 |
| 10 mm | 0.617 | 78.6 |
| 12 mm | 0.888 | 113.1 |
| 16 mm | 1.58 | 201.2 |
| 18 mm | 2 | 254.6 |
| 20 mm | 2.47 | 314.3 |
| 22 mm | 2.98 | 380.3 |
| 25 mm | 3.85 | 491.1 |
| 28 mm | 4.83 | 616 |
| 32 mm | 6.31 | 804.6 |
| 36 mm | 7.99 | 1018.3 |
| 40 mm | 9.86 | 1257.2 |
| 45 mm | 12.50 | 1591.1 |
| 50 mm | 15.42 | 1964.3 |
Rebar Weight Calculation Formula
You can also calculate the weight of rebars manually on the site, but we recommend you to use this calculator. The weight of rebar can be easily calculated by using this standard formula mentioned below:
W= (D2/162.28)* L
Where ‘D’ and ‘L’ are the diameter and the length of the rebar respectively. Take the value of diameter in terms of millimeter and length in terms of meters. You will get the results in kilograms (Kg). After dividing the results with the actual length of rebar you can get the weight per meter run.
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Let us understand this formula by simple example.
Ex : Calculate the weight of TMT Bar having diameter of 8 mm and length 12 meter.
Solution : Using the rebar weight calculation formula you can find the mass of TMT rod by putting the mentioned values in the given formula.
W= (D2/162.28)* L
W= ( 82/162.28)*12 = 4.732 Kg
Now calculate the weight per meter,
W = 4.732/ L
W = 4.732/ 12 = 0.395 Kg/m
We hope this example has cleared all you doubts.
what do the constant factor 162.28 stands for?
Hello Mark,
Hope this clears your doubt!
Formula to calculate the weight of bar :
Weight of Bar = Volume of Bar x Density
= (Area x Length) x (7850)
Here, unit of area = mm^2, length = meter, density = kg/m^3.
= ((π/4)D^2 x 1) x (7850)
The diameter of the steel bar is in millimeters so we have to convert the density and length in millimeters.
= ((3.141593/4)D^2 x (1×1000)) x (7850/(1000x1000x1000))
= ((3.141593 x D^2) x 1000 x (7850/(4x1000x1000x1000))
= (3.141593 x D^2 x 1000 x 0.0000019625)
= D^2 x 0.00616225
= D^2/(1/0.00616225)
= D^2/162.2783886 (≈ 162.28)
= D^2/162.28
We will shortly write a detailed post on how to calculate the weight of steel bars. That might help you understand things better. Until then, sign up for the mailing list to ensure you don’t miss a single update.
HI , does the above formula also apply to mild steel rebar (fy=250) or does it only consider high tensile steel (fy=460) ?
thnx
This is standard formula applied to all grades.
Thanks for your wonderful article.
I will translate your article into Persian soon and publish it on my blog.
Thank you for taking the time to read and learn from this article.
can anyone please convert 62tone or rebar to pc?8mm
It would be great if you share the length of the bar.
If I used GLASS FIBER REINFORCED POLYMER BAR (GFRP) ,then which formula use for its weight calculation ?
You can use the same formula, but ensure to verify the density of the rebar with your manufacturer or seller, as it is made of a different material compared to steel.