The study reported here aimed to identify the relationship of parents' calcium knowledge with diet-related parental practices and determinants of calcium knowledge. A cross-sectional survey was conducted measuring parental practices, calcium knowledge, and demographics. A convenience sample of 599 racially/ethnically diverse parents of children 10-13 year-olds completed questionnaires. Higher education and having a daughter were associated with higher calcium knowledge; being Asian or Hispanic and born outside the U.S. were associated with lower calcium knowledge. Parents with greater calcium knowledge were more likely to engage in healthy parenting practices. These factors may be important considerations for Extension educators in nutrition education.