Go to the source:
http://www.ga.gov.au/oracle/geomag/agrfform.jsp
Quote:
Requested: Latitude -41o 22' 00", Longitude 147o 3' 00", Elevation 0 km, Date 2014/01/1
Calculated: Latitude -41.3667o, Longitude +147.0500o, Elevation 0.00 km, Epoch 2014.0000
Magnetic Field Components
D = 13.944 deg
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There is a declination app for iOS. I don't know about Android.