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Encouraging college students to volunteer is a supposed but uncharted way to contribute to their career commitment. Clarifying the ways of the contribution is therefore necessary. From the social capital perspective, volunteering and network density among friends represent social capital to reinforce each other. Thus, the purpose of this paper is to study the enhancement of the contribution by the density.

The examination employs a two-wave panel survey of 410 university students to estimate the effects of volunteering and friend network density at Wave 1 on career commitment at Wave 2. Essentially, the examination adjusted for biases due to sample attrition and self-selection into volunteering.

Volunteering at Wave 1 showed a significant contribution to career commitment at Wave 2. Moreover, the contribution significantly increased with friend network density at Wave 1.

Findings from this panel survey of university students in Hong Kong require future research for substantiation. For instance, such research can apply an experimental design to volunteering to guarantee the internal validity of the contribution of volunteering.

Social capital theory is applicable to the promotion of career commitment. Specifically, optimizing the strength of social capital through the combination of volunteering and friendship is promising.

Empirical support for the application of social capital theory to career development is evident. Particularly, the joint contribution of volunteering and friendship is demonstrable.