Combined Footing Design Calculator

Design combined footings for two adjacent columns with shear/moment diagrams and punching shear

ACI 318-19DPT 1008-61Shear & Moment DiagramsPunching Shear Check

Note: This tool calculates per ACI/DPT standards but does not replace review by the design engineer.

Service (unfactored) loads used for bearing and settlement checks.

Load P1 (kN)

Moment M1 (kN·m)

Column 1 width (mm)

Column 1 depth (mm)

Position x1 from left edge (m)

Distance from the left edge of the footing to the column center

Loads (factored)

Use factored values (e.g. 1.2D+1.6L) in kN / kN·m; compare with expected column/building load

Load P1 (kN) Pᵤ₁

Moment M1 (kN·m) Mᵤ₁

Load P2 (kN)

Moment M2 (kN·m)

Column 2 width (mm)

Column 2 depth (mm)

Position x2 from left edge (m)

Loads (factored)

Use factored values (e.g. 1.2D+1.6L) in kN / kN·m; compare with expected column/building load

Load P2 (kN) Pᵤ₂

Moment M2 (kN·m) Mᵤ₂

Bearing capacity: net allowable value (kN/m²); 150–300 kN/m² typical for compacted soil

Net allowable bearing capacity (kN/m²)

Footing depth (m)

Footing width

Concrete

Steel

Fill in both column data and click Calculate to design the combined footing