Dataset for the Perceived Stress Scale for Kids (PeSSKi) study - project to examine initial psychometric properties of a new self-report stress scale for children. Data are from phase two online testing of the scale with 123 children aged 7-11 years. Reliability was evaluated using Cronbach’s alpha. Construct validity was assessed via examination of correlation coefficients between the PeSSKi and additional scales: convergent and divergent validity were assessed using the Penn-State Worry Questionnaire for Children (PSWQ-C) and the Students’ Life Satisfaction Scale (SLSS) respectively.