This study examines the validity of the three-factor model of person–environment (P-E) fit perceptions in a sample of German university students (N = 326) and examines the connection between these fit types, the Big Five personality traits, and markers of academic success, namely, academic satisfaction, academic performance, and major change intention. Building upon previous research, a three-factor model of P-E fit perceptions with complex loadings was hypothesized differentiating between interest-major (I-M) fit, needs-supplies (N-S) fit, and demands-abilities (D-A) fit. Results from confirmatory factor analyses supported the suggested three-factor solution. Zero-order correlations, multiple regression analyses, and relative weight analyses identified perceived I-M fit as the key predictor of academic satisfaction and major change intention. D-A fit was the strongest predictor of academic performance. Finally, a hierarchical regression approach revealed that personality traits did not improve the prediction of any outcome over perceived P-E fit.