From MIT: The Living Wage Calculator
In many American communities, families working in low-wage jobs make insufficient income to live locally given the local cost of living. Recently, in a number of high-cost communities, community organizers and citizens have successfully argued that the prevailing wage offered by the public sector and key businesses should reflect a wage rate required to meet minimum standards of living. Therefore we have developed a living wage calculator to estimate the cost of living in your community or region. The calculator lists typical expenses, the living wage and typical wages for the selected location.