免费钢材重量计算器
计算各种型钢和钢板的理论重量。
总重量
88.8 kg
Total Weight vs Bar Diameter
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.
计算示例
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
常见问题
What are standard rebar sizes?
Metric: 6, 8, 10, 12, 16, 20, 25, 32, 40 mm. US/Imperial: #3 (10mm), #4 (13mm), #5 (16mm), #6 (19mm), #7 (22mm), #8 (25mm), #9 (29mm), #10 (32mm), #11 (36mm).
How do I calculate the number of bars?
Total length = number of bars x bar length + lap splice allowances. Add 10-15% for waste, bends, laps, and cutting losses.
Does this formula work for other steel shapes?
For round bars, yes. For structural sections (I-beams, channels), use the weight per metre from manufacturer tables, as the cross-section is not a simple circle.
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