This interactive calculator tool projects the caseload, budgetary, financial, and clinical impact that policy makers often request to show that funding CHW services is a worthwhile investment. This tool utilizes public health data to estimate the potential impact of a specific CHW pediatric asthma intervention model developed by the King County Asthma Program in Washington State. The tool allows users to enter their own data if they have it, or to rely on data complied by the developers from published studies, publicly available databases, and data the developers collected from CHWs and their employers.