Steel Beam Size Calculator

Calculate bending moment, shear force and required section modulus. Get a suggested standard UB section for preliminary sizing.

Beam Type

Load & Span

Load Type

Span length

Total load (kN/m)

Steel grade

Results

Bending Moment

—

kN.m

Shear Force

—

Req. Wpl

—

cm³

Deflection (L/360)

—

Suggested UB Section

Enter dimensions to get a suggestion

Common UB Sections

203×133 UB25 258 cm³

254×146 UB31 393 cm³

305×165 UB40 560 cm³

356×171 UB45 775 cm³

406×178 UB54 1051 cm³

457×191 UB67 1471 cm³

533×210 UB82 2059 cm³

610×229 UB101 2881 cm³

610×305 UB149 4111 cm³

762×267 UB173 5631 cm³

Steel Grade Properties

S275 — General structural 275 MPa

S355 — Higher strength 355 MPa

Preliminary Sizing Only

This tool provides rough preliminary beam sizes for early design. A qualified structural engineer must verify all designs. Does not account for lateral torsional buckling, web bearing, or combined loading.