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SHEET TWF·T-07 REV 2026-08-20 METHOD M.2026-08-20.1

Steel weight calculator

Nominal volume and mass for plate, round bar, rectangular bar, round tube and rectangular hollow section from entered millimetre dimensions and entered density — supplier section data governs ordering and lifting decisions.

Classification Geometry and density planning estimate

InputsT-07
F-01 Section shape

Five nominal section shapes; the dimension fields below follow the shape.

F-02
mm

Section length, greater than 0.

F-03
mm

Plate width, greater than 0.

F-04
mm

Plate thickness, greater than 0.

F-09
kg/m³

You supply this figure — 7,850 is the worked steel example, not a default.

JavaScript is off in this browser, so no live record can be issued. The worked example below walks the full method with real figures, and the blank card on this page prints as a worksheet.

R-STEEL-nnn

Steel weight calculator

Awaiting inputs — enter values and issue a record. Empty slots below print as a blank worksheet.

Field slots

F-01Section shape
F-02Length
F-09Density
RECORD VOID — inputs changed since issue. Recalculate to issue a new record.

Worksheet · https://theweldfab.com/tools/steel-weight-calculator/ · METHOD M.2026-08-20.1 · REV 2026-08-20

Worked example

STATIC — not a live result

A 1,000 × 500 × 10 mm plate at an entered density of 7,850 kg/m³: volume 0.005 m³ and mass 39.25 kg.

R-STEEL-EX

Steel weight calculator

Planning estimate

≈ 39.25 kg at the entered density

Entered assumptions

F-01Section shapePlate
F-02Length1000 mm
F-03Width500 mm
F-04Thickness10 mm
F-09Density (entered)7850 kg/m³

Planning figures

R-01Volume0.005 m³
R-02Mass39.25 kg
R-03Mass per metre of length39.25 kg/m

Planning support only — verify against nameplate/manufacturer data.

RECORD VOID — inputs changed since issue. Recalculate to issue a new record.

Method

M.2026-08-20.1

All dimensions are entered in millimetres and converted to metres; mass is volume m³ × density kg/m³. The volume per shape:

  • Plate and rectangular bar: V = length × width × thickness
  • Round bar: V = π × (diameter² ÷ 4) × length
  • Round tube: V = π × ((OD² − ID²) ÷ 4) × length, requiring OD above ID and ID at least 0
  • Rectangular hollow section: V = (outer width × outer height − inner width × inner height) × length, with inner dimensions derived from the wall and required to stay positive

Worked figures: a 1,000 × 500 × 10 mm plate is 0.005 m³; at an entered 7,850 kg/m³ that is 39.25 kg.

Limits & stop conditions

T-07
  • Nominal entered dimensions and your entered density only — rolled sections vary in tolerance and real density; supplier section data governs lifting and ordering decisions.
  • HOLD — a round tube needs the outside diameter above the inside diameter (inside at least 0), and a rectangular hollow section needs wall-derived inner dimensions that stay positive; otherwise the record is unissued.
  • Density is a figure you supply; 7,850 kg/m³ is the worked steel example, not a default.

Source register

No external sources on this sheet: every figure derives from the values you enter and the stated formula — see Methodology.

Bench Awaiting values