Rigid square and round footings of the same area will produce the same average bearing pressure although the deeper subsurface pressure distribution will be different for each. Square footings are almost always used simply because they are easier to form up and reinforce than round ones. The corners of a square footing are not prone to breaking off because the maximum bending stresses are in the centre of the footing.There are situations where a round footing is more appropriate, such as the foundation for a major airport control tower, water storage, wind turbine or power station chimney, but typical building footings are square or rectangular because those shapes are more practical.