Career adaptability is a critical factor in supporting vocational high school (SMK) students' transition to the workforce. The Career Adapt-Abilities Scale (CAAS) was developed to measure four core dimensions: concern, control, curiosity, and confidence. However, an Indonesian version suitable for vocational students remains unavailable. This study aimed to culturally adapt, validate, and assess the reliability of the Indonesian version of CAAS. The adaptation process followed rigorous procedures, including expert reviews and psychometric testing. A total of 396 vocational students (grades X and XI) participated. Data were analyzed using Confirmatory Factor Analysis (CFA) and multigroup invariance testing. CFA results confirmed that all items had factor loadings ≥ 0.50, with satisfactory Average Variance Extracted (AVE) and Composite Reliability (CR). Model fit indices showed acceptable results (CFI=0.943, RMSEA=0.056). Multigroup invariance testing revealed configural, metric, scalar, and strict invariance across grades. Low-loading items were retained based on theoretical considerations. The Indonesian version of CAAS is a valid and reliable instrument for measuring career adaptability among vocational high school students. It can be used by school counselors to design tailored career guidance interventions. Future studies should explore predictive validity and application across diverse educational levels and contexts.