Steel weight calculator

Formula

W = A × L × ρ × n

W

total weight

A

cross-sectional area

L

length of one piece

ρ

density

n

number of pieces

Cross-sectional area by shape

Flat bar

A = b × t

Square bar

A = a²

Round bar

A = π d² / 4

Hexagonal bar (s across flats)

A = (√3 / 2) × s²

Pipe or round tube

A = π × t × (D − t)

Square hollow section

A = 4 t (a − t)

Rectangular hollow section

A = 2 t (h + b − 2t)

Equal angle

A = t (2a − t)

Unequal angle

A = t (a + b − t)

Assumptions

• Nominal dimensions, uniform along the length.
• Sharp corners: corner radii on hollow sections and root and toe radii on angles are ignored.
• Density defaults to 7850 kg/m³, the nominal unit mass of carbon steel.

Limitations

• Rolling tolerances and mill overweight are not included.
• Cutting allowances, end preparation, holes and coatings are not included.
• Hollow sections come out slightly heavy (their rounded corners are ignored) and angles slightly light (their root fillet is ignored); use the producer's table where exact weights matter.
• For rolled beams and channels, use the published section tables rather than this calculator.