["Family Relations, EarlyView. ", "\nAbstract\n\nObjective\nThis study describes the development of the Bias Against Childfree Women (BAC‐W) scale.\n\n\nBackground\nPrevious work on childfree women has relied largely on qualitative assessments and vignette methods, limiting broader empirical inquiry. A validated survey‐based measure is needed to expand methodological tools and deepen understanding of bias toward childfree women.\n\n\nMethods\nParticipants were 603 nationally representative U.S. adults (51% women; 64% White, 12% Black, 10% mixed race, 14% Asian/other; 73% employed). An initial pool of 51 items was evaluated using factor analysis and item response theory, with validity testing conducted following item refinement.\n\n\nResults\nLong‐ (20 items) and short‐form (five items) versions of the scale were developed that showed sound reliability. Validity tests showed expected differences across gender, sexual orientation, ethnicity, and marital, employment, and child status. Higher bias was also associated with religiosity, conservatism, and sexism.\n\n\nConclusion\nThe BAC‐W long and short forms are reliable and valid measures of bias against childfree women that address recent calls for expanding the methodological tools in this area of study.\n\n\nImplications\nThese tools can inform researchers, policymakers, educators, and community leaders seeking to identify, monitor, and reduce bias toward childfree women.\n\n"]