Steel Tube Weight Calculator
Estimate steel tube weight fast for round square and rectangular sections. Choose metric or imperial sizes set length quantity and material density. Get kg per meter lb per foot and total weight with exports instantly.
Developed by: Nohman Habib
Example Data
| Shape | Dimensions | Thickness | Length | Quantity | Typical Output |
|---|---|---|---|---|---|
| Round | OD 60 mm | 3 mm | 6 m | 10 | Shows kg/m and total kg for 10 pieces |
| Square | 50 × 50 mm | 2 mm | 6 m | 5 | Shows piece weight and total with waste |
| Rectangular | 80 × 40 mm | 3 mm | 12 m | 2 | Shows area and lb/ft for imperial comparison |
Formula
This calculator uses cross-sectional area and density to estimate theoretical weight.
- Round tube area: A = π × ( (OD/2)² − (ID/2)² ), where ID = OD − 2t
- Square tube area: A = S² − (S − 2t)²
- Rectangular tube area: A = (W × H) − ( (W − 2t) × (H − 2t) )
- Weight per meter: kg/m = A × ρ
- Piece weight: kg = (kg/m) × L
- Total weight: total kg = piece kg × quantity
- Waste/overage: total kg with waste = total kg × (1 + waste%/100)
How to Use This Calculator
- Select the tube shape: round, square, or rectangular.
- Choose metric or imperial units and enter the dimensions and wall thickness.
- Enter the tube length and quantity of pieces you need.
- Select a density preset or enter a custom density if required.
- Click Calculate to view kg/m, lb/ft, piece weight, and total weight.
- Use Download CSV or Download PDF to export your calculation.
FAQs
1) Is this the exact shipping weight of the tube?
No. Results are theoretical. Real weight can vary due to mill tolerances, seam type, coating, and manufacturing standards.
2) What is the default density used for carbon steel?
The default preset uses 7850 kg/m³, which is a commonly used value for carbon steel in engineering estimates.
3) Can I use imperial sizes and still get metric results?
Yes. The calculator converts internally to SI units. It displays both kg/m and lb/ft so you can compare instantly.
4) Why does thickness have a maximum limit?
Because the tube must remain hollow. Thickness cannot be equal to or greater than half of the outside dimension, otherwise the inside becomes zero or negative.
5) What does waste or overage percentage do?
It increases the total weight to account for cutting losses, extra ordered pieces, and jobsite allowance. It does not change kg/m.
6) What if I have a special steel grade?
Use the custom density option. If your supplier provides a density or you have a spec sheet value, enter it in kg/m³.