This steel bar weight calculator finds the weight of TMT reinforcement steel bars using the standard formula Weight = D² / 162 × length, where D is the bar diameter in mm.
Steel Bar Weight Calculator
Formula
Weight (kg/m) = D² / 162 • Total weight = (D² / 162) × length × number of bars
How to Use This Calculator
- Enter the bar diameter in millimetres.
- Enter the length of one bar in metres.
- Enter the number of bars (optional, defaults to 1) and click Calculate.
Worked Example
For a 12 mm bar of length 12 m: weight per metre = 12²/162 = 0.889 kg/m, so one bar weighs about 10.67 kg.
Frequently Asked Questions
What is the formula for steel bar weight?
Weight per metre = D squared divided by 162, where D is the bar diameter in millimetres.
Where does the number 162 come from?
It comes from the density of steel (7850 kg/m3); the area formula and unit conversion simplify the constant to 162.
What is the weight of a 12 mm steel bar?
A 12 mm bar weighs about 0.889 kg per metre (12 squared / 162).