Free technical tool · Steel Knowledge
Steel tube weight calculator: kg/m, bar weight and tonnes.
Estimate structural hollow section masses for circular (CHS), square (SHS) and rectangular (RHS) steel tubes. Select EN 10219, EN 10210 or the geometric method. The result updates immediately as you enter dimensions.
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Calculate theoretical steel tube weight
Enter nominal outside dimensions in millimetres, plus bar length and quantity.
EN 10210 and EN 10219 estimates use nominal corner-radius rules for SHS and RHS, and 7,850 kg/m³. Free geometric mode ignores rounded corners and accepts a different density.
Calculated result
Theoretical linear mass
14.41 kg/m
- Weight per bar
- 172.92 kg
- Total metres
- 120 m
- Total weight
- 1,729.15 kg
- Total tonnes
- 1.7292 t
Estimates only. Not a certified, published or verified weight reference.
Calculating hollow section mass
For CHS, the calculation uses the area of an annulus. For SHS and RHS under EN 10210 or EN 10219, it also accounts for nominal corner radii. Total theoretical tonnage equals weight per metre × bar length × bar count ÷ 1,000. These are estimates, not certified published weights or a product conformity assessment.
- CHS — Circular
- Enter outside diameter and wall thickness in millimetres.
- SHS — Square
- Enter the outside side dimension and thickness.
- RHS — Rectangular
- Enter outside width, outside height and thickness.
How do you calculate the weight of a round steel tube?
The theoretical cross-sectional area in mm² is π × t × (D − t), where D is the outside diameter and t is wall thickness. Multiply that area by steel density (7,850 kg/m³ by default) and divide by 1,000,000 to obtain kg/m.
Why can EN 10210 and EN 10219 give different SHS or RHS weights?
The calculation uses different nominal outer and inner corner radii for cold-formed and hot-finished structural hollow sections. These change the nominal section area, so estimated kg/m may differ for the same outside dimensions.
Can I use different steel density?
Yes, in free geometric mode. Normative calculation mode uses the nominal steel density of 7,850 kg/m³ and its applicable corner geometry.
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