Department of Numbers

San Francisco, California Home Affordability

The data below measures home affordability for the San Francisco-San Mateo-Redwood City, California metropolitan area using price-to-income and price-to-rent metrics. The maximum affordable loan amount for the median household income is also calculated.

San Francisco, California Home Price-to-Income Index

The current price-to-income ratio for San Francisco is 7.69 as determined by June 2010 Realtor median sales prices. The chart below shows a history of the ratio as an index calculated from the Federal Housing Finance Agency's San Francisco HPI series.1 Median household income data for San Francisco is from the Census American Community Survey.2

Price-to-Income: FHFA

Note: Index set to 100 in Q1 of 2000

San Francisco, California Home Price-to-Income Index History

Date FHFA
June 2010 127.7
March 2010 127.6
December 2009 128.5
September 2009 128.2
June 2009 129.7

San Francisco, California Home Price-to-Rent Index

The current price-to-rent ratio for San Francisco is 34.88 as determined by June 2010 Realtor median sales prices. This ratio is calculated using household size adjusted median contract rent for San Francisco. The chart below shows an index of the rent ratio calculated from the metro FHFA HPI series and the San Francisco median contract rent data from the Census ACS.

Price-to-Rent: FHFA

Note: Index set to 100 in Q1 of 2000

San Francisco, California Home Price-to-Rent Index History

Date FHFA
June 2010 118.1
March 2010 117.9
December 2009 118.8
September 2009 118.5
June 2009 119.9

San Francisco, California Inferred Affordable Mortgage

The inferred affordable mortgage is determined by taking the median household income for San Francisco, California and calculating the mortgage 30% of that income could afford. Traditionally, 30% of income is the maximum amount a homeowner could use towards a home loan. Inferred affordable loan values are calculated from ACS median household income and average monthly mortgage rates.

Inferred Affordable Mortgage

Date Inferred Mortgage
July 2010 $376,516
June 2010 $368,720
May 2010 $362,409
April 2010 $353,844
March 2010 $359,109
February 2010 $358,292
January 2010 $356,665
December 2009 $360,753
November 2009 $362,824
October 2009 $359,930
September 2009 $355,452
August 2009 $350,268
July 2009 $349,088

1. Specifically, FHFA data is from the non seasonally adjusted, all-transactions quarterly series.

2. Income data for the previous year is carried into the following year prior to the release of new income data.