<p>This calculator is rougher but it does take state into account: </p>
<p>[Federal</a> Housing Finance Agency - HPI Calculator](<a href=“http://www.fhfa.gov/Default.aspx?Page=86]Federal”>http://www.fhfa.gov/Default.aspx?Page=86)</p>
<p>If you think the amount is inaccurate, there are a few other ways to come up with an estimated number. You could ask a real estate professional to give you an estimate. You could go online and print out the recent sales prices of comparable houses. I would think if your figure is unusually low, however, you may want to include a comment on the Profile explaining how you got your number.</p>