Set up the algebraic equation: bearing stress (BS) = F/A. In this equation, F stands for how much force exists between the two contacting objects. If you are using SI units, the measure of force is in Newtons. In the U.S., use pounds to indicate the degree of force. The other factor of the equation is A, or the surface area where the two objects make contact. In SI units, use square meters to measure the area. In U.S. units, use square inches for the measurement.
Insert the measurement of force (F) into the equation. For example; if the force internally exerted between two objects is 10 lbs., your equation becomes BS = 10/A.
Insert the area measurement into the equation. Using the same example; if the area is 2 square inches, the equation becomes BS = 10/2.
Divide the force (F) by the area (A) to solve for bearing stress (BS). Continuing the same example; this results in 5 lbs. per square inch, or 5 psi. If, in this example, SI units are used, the end result is 5 Newtons per square meter, or 5 Pasquals.