Slab load to beam line-load calculator.

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Tributary width is the bridge from area load to line load.

Floor actions are often entered as area loads in kPa, while a supporting beam is checked with a line load in kN/m. The one-way tributary width makes that conversion explicit.

Governing relationship

The slab self-weight is g_self = ρgt / 1000. Add finishes and partitions to obtain the dead load g_k, then add the imposed load q_k. The service line load is w_k = (g_k + q_k) b_trib.

Keep the load path visible.

• This screen does not choose a code load combination, partial factors, ψ factors, or accidental actions.
• Two-way slab distribution, openings, concentrated loads, edge conditions, cantilevers, walls, and point reactions need separate treatment.
• Confirm the tributary width and each floor-load component against the architectural, structural, and project information.