DPI Converter is an application for beginner android programmer or lazy programmer like me (haha) to calculate pixel's value to DP.

With DPI Converter you can calculate value from pixel's to Low Density Medium Density High Density Extra High Density Extra Extra High Density. DPI Converter is very simple to use just add pixel's value choose Density and press the Convert Button. The result will show all values from from Low Density Medium Density High Density Extra High Density Extra Extra High Density.

Information about DPI:
xxhdpi (~480dpi)
xhdpi (~320dpi)
hdpi (~240dpi)
mdpi (~160dpi)
ldpi (~120dpi)

http://developer.android.com/guide/practices/screens_support.html