Steel Round Bar Weight Calculator
Steel round bar weight scales with the square of diameter. Doubling diameter makes the bar four times heavier per metre.
steel round bar weight calculator steel round bar kg per meter round steel bar weight
Steel round bar formula
kg/m = 7.85 * pi * d^2 / 4000
Example sizes
- 20 mm: about 2.47 kg/m.
- 25 mm: about 3.85 kg/m.
- 50 mm: about 15.4 kg/m.
Why it rises fast
Area is proportional to diameter squared, so small diameter increases have a large weight effect.
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