Steel weight calculator

The geometry routes convert millimetres to metres and use the density you enter. No density is assumed by the live form:

• Plate and flat bar: area = width × thickness
• Round bar: area = π × diameter² ÷ 4
• kg/m = area m² × density kg/m³
• mass kg = kg/m × length m

The UK-section route does not approximate root radii, corner radii or rolling tolerances from a few nominal dimensions. Instead it records the section family and exact designation, then applies mass kg = referenced kg/m × length m. Copy the kg/m value for that designation from current section data or the supplier.

SCI’s Blue Book route covers beams, columns, channels, angles and hot- and cold-formed hollow sections; it is a reference route, not a frozen product list on this page^[S1].

Worked geometry example: 1,000 × 500 × 10 mm plate at an entered 7,850 kg/m³ gives 0.005 m³, 39.25 kg/m and 39.25 kg over 1 m.

Worked section-reference example: an entered 40.3 kg/m over 6,000 mm gives 241.8 kg. The 40.3 kg/m is demonstration input only, not a built-in weight for an unnamed section; copy the live figure for the exact designation being planned.

• UK sections are calculated only from the mass per metre you enter for an exact UB, UC, PFC, RSA, SHS, RHS or CHS designation. No nominal section size or kg/m preset is built in.
• Supplier and current section data govern ordering, handling and lifting. Confirm the product form, standard, designation, tolerances and actual supplied length before use.
• Plate, flat-bar and round-bar routes use ideal nominal geometry. They do not include rolling tolerances, scale, coatings, holes, cut-outs, weld metal or fabrication additions.
• HOLD — a missing route-specific field, an unknown family, blank designation, non-positive kg/m or density, or any non-finite result keeps the record unissued.
• 7,850 kg/m³ and 40.3 kg/m are labelled worked-example entries, never live defaults.