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Background: An appropriate size of device for patent ductus arteriosus (PDA) could be chosen by a stretched PDA size. We propose prediction of stretched size from intact PDA size., Methods: A total of 361 patients was enrolled. Intact size was measured on angiography before closure, and stretched size was the narrowest diameter immediately after device implantation., Results: The median patient age was 2.8 years. Intact diameter and stretched diameter were 3.6±1.4 mm and 5.1±1.3 mm. The difference and difference ratio were 1.5±0.8 mm and 51.3±38.1% and had negative linear correlations with age (P<0.001). Patients were divided into four groups: <2 years old (159), 2-15 years old (68), 15-40 years old (72), and ≥40 years old (62). Among groups, difference and difference ratio were significantly different. Stretched diameter was inferred by the following formulas: stretched diameter = 0.660 × intact diameter + 2.791 (<2 years old); = 0.971×intact diameter + 0.058 × age + 1.131 (2-15 years old); = 0.790 × intact diameter + 2.263 (15-40 years old); and = 0.837 × intact diameter + 1.353 × BSA - 0.096 (≥40 years old)., Conclusions: Stretched PDA diameter can be predicted from intact diameter and might be helpful for safe PDA closure especially in small infants.