This calculator determines the size of each tributary area of your deck. It then determines the total load from each tributary area based on the design load of your deck. Default is 50 psf which you can change.
The total load for each tributary area is then divided by the area of each footing in order to determine the load psf imposed on the soil.
This value must not be greater than the bearing capacity of the soil. If it is, you must increase the size of the footing to spread the weight out over a greater surface area or increase the number of footings.
For help, simply click on the beside the section you need help with, Or watch this Tutorial Video.