Aim:The volume of brain hematoma is one of the important criteria for the prognosis of patients with haemorrhagic stroke. In radiology, the classical formula for calculating hematoma volume is simple ABC/2 (sABC/2). Moreover, in the literature, new formulas have been proposed that are not very practical for bedside use. We thus aimed to find a more practical and effective formula than sABC/2 to calculate the hematoma volume in patients with subdural and parenchymal haemorrhage.Material and Methods:We reviewed the records of 157 patients who underwent brain computed tomography examinations for stroke from January to October 2017. Our method, sABC/2 formula, and the planimetric method (the gold standard) were used for measuring the volumes of hematoma.Results:The concordance in brain hematoma volumes calculated by sABC/2 and the proposed method as compared to planimetry were 0.92 and 0.93, respectively (p < 0.05). The proposed method calculates the subdural hematoma volumes much better than the conventional one, and the root mean square error (RMSE) values were 32.17 and 20.62 ml for sABC/2 and our new method, respectively, whereas the RMSE values for parenchymal hematomas were 25.01 and 20.46 ml for sABC/2 and our new method, respectively.Conclusion:Our new formula for calculating the volume of subdural and parenchymal hematomas is as practical as sABC/2 and allows the clinician to apply the method bedside.