Hidroteknik Calculators
Pipe & Rod Weight Calculation
The weight of a bar is its cross-sectional area times its length and material density. A solid rod uses the full section; a pipe uses the annular section.
⚙ Open the Hydraulic Calculator →Weight Formula
Mass
m = ρ × A × L
Solid rod section
A = π × d² / 4
Pipe section
A = π × (D² − d²) / 4
D: outer diameter, d: inner diameter. Steel density ρ ≈ 7.85 kg/dm³.
Units
| Quantity | Symbol | Unit |
|---|---|---|
| Density | ρ | kg/dm³ (steel 7.85) |
| Diameter | D, d | mm |
| Length | L | m |
| Mass | m | kg |
Worked Example
Given: Weight per metre for a steel solid rod Ø40 mm and a steel pipe Ø60/Ø50 mm.
1) Solid rod Ø40: A = π×40²/4 = 12.57 cm² → m = 9.86 kg/m
2) Pipe Ø60/Ø50: A = π×(60²−50²)/4 = 8.64 cm² → m = 6.78 kg/m
Frequently Asked Questions
What is the density of steel?
About 7.85 kg/dm³ (7850 kg/m³). Aluminium ≈ 2.70; stainless steel ≈ 8.00 kg/dm³.
What is the difference between pipe and solid rod?
A solid rod uses the full circular section (π×d²/4); a pipe uses the annular section with the bore removed (π×(D²−d²)/4).
How do I get the total weight?
Multiply the weight per metre (kg/m) by the length of the part (m).