|Applications:support for fences posts and mailbox posts, footing for sheds, porches, decks, etc.
Footing for use usually either earth formed, by digging a hole and filling with concrete, or by a heavy duty, round cardboard form (often referred to as Quik-Tube) when the footing is exposed above ground level.
The formula for calculating the volume of concrete for a circular application is
area of the circle (šr²)x height = volume
*make sure all the unit measurements are consistent (in., ft., yd., etc.)