Free Steel Weight Calculator
Calculate the weight of steel bars (rebar) from diameter and total length.
mm
m
Total Weight
88.8 kg
Weight per Metre0.888 kg/m
Quick Check (D^2/162)0.889 kg/m
Total Weight vs Bar Diameter
Steel Bar Weight Calculation
Steel weight is calculated from the cross-sectional area, length, and density.
Formula
Weight per metre = (pi/4) x D^2 x rho
where D is the bar diameter in metres and rho is steel density (7850 kg/m^3).
Quick Formula
Weight (kg/m) = D^2 / 162 (where D is in mm)
This handy shortcut comes from simplifying pi/4 x (D/1000)^2 x 7850.
Example Calculation
100 metres of 12 mm diameter rebar.
- 01Weight per metre = pi/4 x (0.012)^2 x 7850 = 0.888 kg/m
- 02Quick check: 12^2 / 162 = 144/162 = 0.889 kg/m
- 03Total weight = 0.888 x 100 = 88.8 kg
Frequently Asked Questions
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