Objective In the recent decade, millennial generations have been apparently increasing in many workplaces. In addition, Work-life balance is globally considered by the millennial. Work-life balance definitely involves in both working conditions and individual’s health and wellbeing. This study aimed to illustrate the work-life balance of millennial employees by a work-life balance tool and showed its related characteristics.

Methods Validated self-administered 10-question work-life checklists were distributed to the employees who were born during 1980 to 1995 (aged 20 to 35) and worked at the petrochemical company, which workplaces were located in across all regions in Thailand in February 2016. This organisational survey included 1,951 millennial employees. Collected data was explored the link between the result of work-life balance measure and associated demographic factors, psychosocial and health issues, and working conditions.

Results Respondents were approximately 60 percent (n = 1,167). The mean of work-life balance checklist percentage was 61 (SD = 0.4). The result indicated the 15th and 85th percentile were 43.3 and 80, respectively. Furthermore, the ordinal logistic regression shows the association between work-life balance and sex, frequency of exercise activity, sleep status, work conditions and satisfactions; leisure and cooperation.

Conclusion According to the result, the classification of work-life balance by a work-life balance checklist for millennial workers are indicated categories poor at above 80 percent, moderate at between 44.3 and 80 percent, and good at below 44.3 percent. This study also suggests that associated characteristics, health and psychosocial factors, work conditions should be recognised for enhancing work-life balance among the millennial workers.