An overview of the general cost of living index for Chelsea, MA is displayed above for your reference. Residents in Chelsea, MA enjoy a cost of living index of 130. This index is equal to the Massachusetts average, and 30% higher than the national average. The following categories are used when determining the cost of living index for any given city: health care (5%), transportation (9%), utilities (10%), groceries (13%), housing (30%), and goods/services (33%). Clearly, housing and goods/services make up the majority of the formula for calculating the cost of living index. Because of this, the general cost of living for any given area can be estimated by looking at the cost of everyday goods in that area. For those living in Chelsea, MA, the average cost of goods and services is 8% higher than it is in Massachusetts, and it is 30% higher than the national average.