Spread Footing Size Calculator

Estimate the minimum plan area and rectangular footing dimensions from service axial load and allowable soil bearing pressure for preliminary foundation sizing.

Column service load

Allowable soil bearing pressure

kN/m²

Footing/self-weight allowance

Length ÷ width ratio

L/W

Load used

880.0 kN

Required footing area

4.400 m²

Approx. width

2.098 m

Approx. length

2.098 m

Average bearing pressure

200.0 kN/m²

Preliminary sizing only. Final footing design must check eccentricity, moments, one-way shear, punching shear, flexure, reinforcement, settlement, uplift/sliding where relevant, groundwater, load combinations and geotechnical recommendations. Do not use this area estimate as a construction design.