Geomagnetism

Online Calculators

IGRF Declination

Online magnetic declination calculator based on the International Geomagnetic Reference Field Model

IGRF Field Values

Online magnetic field value calculator based on the International Geomagnetic Reference Field Model

WMM Field Values

Online magnetic field value calculator based on the World Magnetic Model

US Historic Declination

Online historical (1750-2010) magnetic declination calculator based on the IGRF and USD polynomial models