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Introduction: Concerns regarding the adverse consequences of radiation have increased due to the expanded application of computed tomography (CT) in medical practice. Certain studies have indicated that the radiation dosage depends on the anatomical region, the imaging technique employed and patient‐specific variables. The aim of this study is to present fitting models for the estimation of age‐specific dose estimates (ASDE), in the same direction of size‐specific dose estimates, and effective doses based on patient age, gender and the type of CT examination used in paediatric head, chest and abdomen–pelvis imaging. Methods: A total of 583 paediatric patients were included in the study. Radiometric data were gathered from DICOM files. The patients were categorised into five distinct groups (under 15 years of age), and the effective dose, organ dose and ASDE were computed for the CT examinations involving the head, chest and abdomen–pelvis. Finally, the best fitting models were presented for estimation of ASDE and effective doses based on patient age, gender and the type of examination. Results: The ASDE in head, chest, and abdomen–pelvis CT examinations increases with increasing age. As age increases, the effective dose in head and abdomen–pelvis CT scans decreased. However, for chest scans, the effective dose initially showed a decreasing trend until the first year of life; after that, it increases in correlation with age. Conclusions: Based on the presented fitting model for the ASDE, these CT scan quantities depend on factors such as patient age and the type of CT examination. For the effective dose, the gender was also included in the fitting model. By utilising the information about the scan type, region and age, it becomes feasible to estimate the ASDE and effective dose using the models provided in this study. [ABSTRACT FROM AUTHOR]