It is a foot to the second power
what measurement do you use to perform check footings levels
B/3
Footings will differ based upon the type of project. Most footings, if building a deck for example, should be about six feet apart.
It is recommended that footings in the Wisconsin area be 48" for most buildings. This is because of the deep frost that can occur in harsh Wisconsin winters.
Isolated footings are constructed invidually & Mat foundation is making of mat and connecting all footings with this mat
Footings, the concrete pads upon which foundation walls are built, must be located beneath the frost line in order to prevent a building from heaving when the ground freezes. If the site is sloped maintaining a constant elevation for the footings would either cause the footings to be above the frost line or significantly deeper than the frost line at one end of the building. Stepping the footings enables them to follow the slope of the site and remain below the frost line without going too deep under the ground. It allows the foundation wall heights to be minimized because the footings are kept as close to the surface as possible.
If you mean stepped footings this is used if the structure is being built on a hill / slope. I stay in Scotland some of terms in construction can be different
foundation reinforcement
Bldg code requirements vary with locale.
connecting between footings
under reamed piles
This would be calculated by how much weight is above the footings.