An overview of the general cost of living index for Portage, MI is displayed above for your reference. Residents in Portage, MI enjoy a cost of living index of 85. This index is 5% lower than the Michigan average, and 15% lower 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 Portage, MI, the average cost of goods and services is 10% lower than it is in Michigan, and it is 15% lower than the national average.