Rib fractures sustained during motor vehicle crashes are a common cause of increased mortality, and their causes within and between individuals is not fully understood. This study aimed to identify the effect of body height, body weight, and body mass index (BMI) on measured structural properties of human ribs. Two‐ hundred sixty one ribs from one‐hundred forty seven individuals were impacted in a dynamic (2.0 m/s) bending scenario representing a frontal thoracic impact. Linear regression revealed body height and weight each had a significant positive relationship with peak force and stiffness (p<0.001 for all), and weaker relationships with total energy (p=0.003 and 0.015, respectively), although explanatory power remained low for all relationships (R²=10‐12%). The introduction of age as an additional variable in multiple regressions increased the ability to predict structural properties:​ R²=33%, 17%, and 41% for peak force, stiffness and total energy, respectively. Body size parameters have a measurable effect on rib properties, but should be used with caution to understand variance in dynamic whole rib response because the source of the majority of variation remains unaccounted for in all models explored here.  Future work will incorporate rib‐specific variables and explore the utility of these relationships on scaling and normalization techniques.