Self-estimates of ability have been shown to be generally inaccurate but still continue to be used in career decision-making. The present study investigates the role of feedback and individual differences in goal orientation and self-efficacy in determining accuracy of self-estimates. A total sample of 94 high school-aged students gave self-estimates of their ability and completed questionnaires regarding self-efficacy, goal orientation and feedback. Participants were categorised as over-estimators, under-estimators or accurate estimators according to the difference between their self-estimate of ability and an objective measure. Results indicated four main areas of feedback sources, and a positive relationship between ability and accuracy of self-estimates. Learning goal orientation and use of feedback were positively related; however their effects on accuracy of self-assessment were contrary to those hypothesised. Practical implications of these findings for career decision-making, as well as suggestions for future research are discussed.