Enter the diameter of the pier into the calculator to determine the size of the sides and the thickness of the pier.

Pier Footing Size Formula

The following formula is used to calculate the pier foot size. 

S = D * 2
T = D * 1.1
  • Where S is the sides of the footing (in)
  • T is the thickness of the footing (in)
  • D is the diameter of the footing (in)

What is a pier footing?

Definition:

A pier footing is a square piece of construction that is used as a base support for the creating of a pier. The size of the footing depends on the diameter of the pier beams.

How to calculate pier footing size?

Example Problem:

The following example outlines how to calculate a pier footing size.

First, determine the diameter of the pier beams. In this example, the diameter is 20 inches.

Next, determine the thickness of the footing using the formula above:

T = D * 1.1

T = 20 * 1.1

T = 22 inches thick

Finally, calculate the length of the sides of the square footing using the formula:

S = D * 2

S = 20 * 2

S = 40 inches