How to calculate rebar weight?
The procedure to use this calculator to calculate the weight of rebar is very simple. The steps to do so are as follows:
- There is no need to measure rebar dimensions because standard sizes of rebar are available in the market.
- Simply enter the diameter and length of the rebar as instructed by the structural engineer. Be sure to enter the diameter of the bar in millimeters.
- Omit 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 weight of the rebar 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
The weight of rebar can be easily calculated using this standard formula mentioned below:
W= (D2/162.28)* L
Where ‘D’ and ‘L’ are the diameter and length of the reinforcing bar, respectively. Take the value of the diameter in terms of millimeters and the length in terms of meters. You will get the results in kilograms (Kg). After dividing the results with the actual length of the rebar, you can get the weight per running meter.
Let us understand this formula with a simple example.
Ex: Calculate the weight of the TMT bar that has a diameter of 8 mm and a length of 12 meters.
Solution: Using the rebar weight calculation formula, you can find the mass of TMT rebar by putting the mentioned values into the given formula.
W= (D2/162.28)*L
W= ( 82/162.28)*12 = 4.732 Kg
Now calculate the weight per meter,
width = 4,732/ length
W = 4.732/ 12 = 0.395 Kg/m
We hope that this example has helped you understand better and cleared all your doubts.