http://www.ngdc.noaa.gov/geomag/magfield.shtml Magnetic Field Calculators http://www.ngdc.noaa.gov/geomag/magfield.shtml Magnetic Field & Declination http://www.ngdc.noaa.gov/geomag/magfield.shtml https://www.ngdc.noaa.gov/geomag/magfield.shtml Find your magnetic field at the NGDC Compute Earth's Magnetic Field Values calculator