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Calculate weight

Steel Weight Calculator

Steel is still the default structural metal in fabrication. For estimating plate, bar, RHS, CHS and pipe, shops almost universally use 7.85 g/cm³ (7850 kg/m³). That figure is close enough for mild steel, most carbon steels, EN8, EN19 and EN24; stainless is heavier and lives on its own page.

Steel · 7.85 g/cm³

Typical shop value for S275 / A36 class carbon steel.

Result

0.785kg

Volume
100 cm³
Volume (m³)
0.0001
Density
7.85 g/cm³
Density
7,850 kg/m³

V = L × W × T W = V × ρ

Why a dedicated steel page?

Use this page when a supplier quote, nest, or cutting list is in steel and you need kilograms or pounds before you order. It is also the right starting point for flame-cut plate, turned bar and welded pipework in carbon steel.

Formula

Weight (kg) = Volume (m³) × 7850. For plate: L × W × T (in metres) × 7850. For round bar: π/4 × D² × L × 7850.

10 mm steel plate, 2 m × 1 m

Volume = 2 × 1 × 0.010 = 0.020 m³. Weight = 0.020 × 7850 = 157 kg.

Alloys on this page

  • Mild Steel — 7.85 g/cm³. Typical shop value for S275 / A36 class carbon steel.
  • Carbon Steel — 7.85 g/cm³. General carbon steels; similar mass to mild steel for estimating.
  • EN8 — 7.85 g/cm³. 080M40 medium-carbon steel, common for shafts and pins.
  • EN19 — 7.85 g/cm³. 709M40 alloy steel used for high-tensile shafts and gears.
  • EN24 — 7.85 g/cm³. 817M40 nickel-chromium-molybdenum steel.

Mill tolerances, mill scale and coatings add a little mass. Laser-cut parts lose the kerf. If you need a certified shipping weight, weigh the bundle — this calculator is for engineering estimates and material take-offs.

See the full material weight calculator for plastics, titanium, tool steels and custom densities, or jump to Aluminium, Copper, Stainless steel, Brass.

Frequently asked questions

How is metal weight calculated?+

Weight equals volume × density. Volume comes from the shape (for example length × width × thickness for a plate, or πr²L for a round bar). Density is looked up for the selected material, or entered manually for a custom alloy.

What density is used for mild steel?+

Mild steel is calculated at 7.85 g/cm³ (7850 kg/m³), which is the value most fabrication shops and steel stockholders use for estimating plate, bar and section mass.

Can I mix millimetres and inches?+

Yes. Each dimension has its own unit (mm, cm, m, inch, feet). The calculator converts everything internally to a consistent system before applying the density, then reports weight in the unit you choose.

How accurate is the result?+

The geometry is exact for the dimensions you enter. Real parts vary with mill tolerance, coating, chamfers and actual alloy density (stainless 304 vs 316, cast vs wrought aluminium). Treat the figure as a reliable estimate, not a certified weighbridge reading.

Does this include pipe schedules?+

Use the Pipe or Tube shape and enter outside diameter and wall thickness. That covers any schedule once you know OD and WT from a pipe chart.

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