钢材重量计算器 — 公式
## 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.
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.
计算示例
100 metres of 12 mm diameter rebar.
- Weight per metre = pi/4 x (0.012)^2 x 7850 = 0.888 kg/m
- Quick check: 12^2 / 162 = 144/162 = 0.889 kg/m
- Total weight = 0.888 x 100 = 88.8 kg