where qult = ultimate bearing capacity of the end-bearing pile or pier (psf or kPa)
Qp = ultimate point resistance force (pounds or kN)
B = width of the piles having a square cross-section (ft or m)
r = radius of the piles or piers having a round cross-section (ft or m)
s¢v = vertical effective stress at the pile tip (psf or kPa)
Nq = bearing capacity factor (dimensionless)