The aim of this study was to determine sustainable learning levels of students. The study also attempted to determine sustainable learning levels of students based on gender and grade. The participants of the study consisted of 742 high school students (354 females and 388 males) in various high schools in Babaeski district of Kirklareli, Turkey during the 2017-2018 academic year. In order to collect data, a scale with two subscales -- behavioural and cognitive -- was developed. The data were analysed through SPSS 17, and arithmetic mean, standard deviation, t-test and one-way analysis of variance (One Way Anova) were used. According to the results of the study, it is concluded that sustainable learning level of the high school students is moderate. The study also found a significant variation in favour of the female students in "learning for development" subdimension on the cognitive subscale of the scale.