Theoretical vs Actual Steel Weight
Catalog and handbook kg/m values are theoretical. Actual weight varies with mill tolerance, fillet radii, and length measurement. For procurement, agree whether quotes use theoretical or weighed mass.
Author: Iron Metal Editorial — Steel sections specialist
Reviewed by: Iron Metal Technical Team — Catalog & standards review
Key differences
- Theoretical kg/m. From standard tables assuming nominal dimensions.
- Mill tolerance. Thickness and depth may vary within standard limits.
- Scale weight. Includes packaging, scale calibration, and cut length.
- Contract basis. Specify theoretical vs actual in PO lines.
Typical variance
Structural sections often within ±2–4% of theoretical; confirm your standard.
FAQ
EN vs ASTM tables? Profile dimensions and kg/m differ by standard — use the matching catalog family.
Who wins on disputes? Follow contract: theoretical billing vs weighbridge is common in steel trade.