Calculator
Steel weight
Theoretical weight at 7.85 g/cm³. Works both ways: metres to tonnes and tonnes to metres.
Product type
—kg per metre
—total, t
—metres per tonne
Formula
Theoretical weight at steel density 7.85 g/cm³. Actual batch weight is by scale and mill certificate.
How mass is calculated
All formulas derive from a steel density of 7.85 g/cm³; the coefficients follow from it rather than from handbook rounding. Catalogue item tables are calculated with the same functions.
| Product | Formula | Unit | Notation |
|---|---|---|---|
| Rebar | Formula0.006165 · d² | Unitkg/m | Notationd — diameter, mm |
| Round bar | Formula0.006165 · d² | Unitkg/m | Notationd — diameter, mm |
| Wire | Formula0.006165 · d² | Unitkg/m | Notationd — diameter, mm |
| Square bar | Formula0.00785 · a² | Unitkg/m | Notationa — side, mm |
| Hexagonal bar | Formula0.006798 · s² | Unitkg/m | Notations — across flats, mm |
| Flat bar | Formula0.00785 · b · t | Unitkg/m | Notationb — width, t — thickness, mm |
| Plate / sheet | Formula7.85 · t | Unitkg/m² | Notationt — thickness, mm |
| Round pipe | Formula0.02466 · (D − t) · t | Unitkg/m | NotationD — outside diameter, t — wall, mm |
| Hollow section | Formula0.0157 · t · (a + b − 2.86 · t) | Unitkg/m | Notationa, b — sides, t — wall, mm |
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