Three-dimensional finite element (3-D FE) modeling has been performed to study the leakage magnetic fields from inclined defects in 14 mm thick carbon steel plate using COMSOL 3.4 Multiphysics software. The tangential (B_x) and normal (B_z) components of the leakage fields from slots with inclinations of 0°, 15°, 30°, 45°, 60° and 75° in the carbon steel plate have been predicted. In order to classify inclined or non-inclined slots, nine parameters such as signal amplitude, full width at half maximum (FWHM), skewness, area under the signal, etc. have been determined from the model predicted MFL signals. In order to quantify the angle of inclination accurately, multiple linear regression has been proposed in this paper. The model predicted features of the MFL signals have been experimentally validated for a few cases.