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Steel Weight Per Metre Calculator

Work out steel weight per metre instantly with clear inputs, formula shown and shareable results.

About Steel Weight Per Metre Calculator

Any steel section weighs its cross-sectional area times the density of steel, 7850 kg/m³. Working in millimetres, mass per metre is area in mm² times 7.85 divided by 1000. That single relation covers round, square and flat bar; only the area formula changes.

Formulas

Unit weight

kg/m = area mm² x 7.85 / 1000

Areas

Round = pi d²/4; square = a²; flat = width x thickness

Worked example

With the default values below, Steel Weight Per Metre Calculator returns Weight per metre of 0.8878. Change any input above and every figure here is recalculated in your browser.

Inputs used

Section shapeone of Round bar, Square bar, Flat bar
Round bar
Diameter, side or widthminimum 0.1 mm
12 mm
Thickness (flat bar only)minimum 0.1 mm
6 mm

Results

Weight per metre
0.8878 kg/m
Cross-sectional area
113.10 mm²
Weight of a 6 metre length
5.327 kg
Metres per tonne
1,126.4 m

Step by step

  1. 1Values used
  2. 2Unit weight
  3. 3Areas
  4. 4Weight per metre= 0.8878 kg/m
  5. 5Cross-sectional area= 113.10 mm²
  6. 6Weight of a 6 metre length= 5.327 kg
  7. 7Metres per tonne= 1,126.4 m

Assumptions and limits

  • The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 4 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How is the Steel Weight Per Metre figure worked out?

kg/m = area mm² x 7.85 / 1000. Any steel section weighs its cross-sectional area times the density of steel, 7850 kg/m³.

Does this work for hollow and rolled sections?

The density relation does, but you must use the true area. For tube use the annulus, and for rolled beams take the tabulated area from the section tables rather than approximating.

What values do I need to enter?

This calculator takes 3 inputs: Section shape, Diameter, side or width, Thickness (flat bar only). The pre-filled defaults are a realistic worked example — replace them with your own site or project figures.

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