The Load Calculator is here to help you determine the linear loads on your beam, joist, rafter, purlin, or other structural member. A linear load is measured in pounds per linear foot (plf), which is the product of the tributary width (measured in feet), and the surface load (measured in psf). The tributary width is the effective width that is supported by the structural member.
In the example below, the beam supports joists from the left and the right side of the floor. The left joist spans 16-feet, and 8-feet of its load is supported by the beam. The right joist also spans 16-feet, and 8-feet of its load is supported by the beam. So, the tributary width is 16-feet which is the sum of 8-feet from the left and 8-feet from the right.
Figure 1. Tributary Width.
Continue by submitting the information in the form in the left margin.