The weight of a steel bar can be calculated using the formula:
Weight of steel bar in m(meter)=D2L/162
or,
Weight of steel bar in ft.(feet)=D2L/533
Where
- D is the diameter of the steel bar in millimeters (mm)
- L is the length of the steel bar in meters (m) or in feet (ft.)
Note: 162 is a constant that represents the density of steel in grams per cubic centimeter (g/cm3).
Example 1
let’s say you have a steel bar with a diameter of 12mm and a length of 3 meters.
Substitute the values of D and L into the formula:
Weight of steel bar in m(meter)=D2L/162
Weight of steel bar in m(meter)=12x12x3/162
= 2.66 Kg/m
Therefore, the weight of the steel bar is 2.66 kg.
Example 2
Let’s change the above example units in feet. Now we have a steel bar with a diameter of 12mm and a length of 3 feet.
Substitute the values of D and L into the formula:
Weight of steel bar in ft.(feet)=D2L/533
Weight of steel bar in ft.(feet)=12x12x3/533
=0.81Kg/ft.
Example 3
Once again take the above Example no 1 for reference but with some modification. Assume we have a 5 steel bar in quantity with a diameter of 12mm and a length of bar is 3m. Calculate the weight of the steel bar in Ton.
Solution:
Given data
Dia of steel bar = 12mm
Length of steel bar = 3m
Quantity of steel bar = 5
Put these values in the formula
Weight of steel bar in m(meter)=D2L/162
=12x12x3x5/162
=2160/162
=13.33 kg
Now we have weight in kg
To convert it to a ton we have to divide it by 1000
=13.33/1000
= 0.0133 ton
Steel bar weight size table
Here is a table of the unit weight of steel bars for different sizes in millimeters (mm) and their equivalent weight in kilograms (kg) and feet (ft):
| Bar Size (mm) | Weight (kg/m) | Weight (kg/ft) |
| 6 | 0.222 | 0.067 |
| 8 | 0.395 | 0.120 |
| 10 | 0.617 | 0.188 |
| 12 | 0.888 | 0.271 |
| 16 | 1.579 | 0.482 |
| 20 | 2.469 | 0.753 |
| 25 | 3.858 | 1.176 |
| 32 | 6.313 | 1.925 |
FAQs
How do you calculate the weight of a steel bar, and what’s the formula used?
The weight of a steel bar is calculated using the formula: Weight (in meters) = D^2L/162 or Weight (in feet) = D^2L/533, where D is the diameter in millimeters, L is the length in meters or feet, and 162 is a constant representing steel density.
Can you provide an example of calculating the weight of a steel bar in meters?
Sure, for a 12mm diameter and 3m length steel bar, the weight is 2.66 kg, using the formula: D^2L/162 = 12x12x3/162 = 2.66 kg/m.
How about an example of calculating the weight of a steel bar in feet?
Certainly, for the same 12mm diameter and 3 feet length, the weight is 0.81 kg, using the formula: D^2L/533 = 12x12x3/533 = 0.81 kg/ft.
