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Links to related web resources go to NOAA's Space Weather prediction Center Now DoD World Magnetic Model Home Links and descriptions of magnetic field models and software go to the Geomagnetic Data Home go to all data and information Answers to Frequently Asked Questions Go to the Space Physics Interactive Data Resource Geomagnetic Data online at NGDC

Estimated Values of Magnetic Field Properties

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This calculator will be phased out May 2012.

This form computes the estimated values of Earth's magnetic field, including magnetic declination (D), based on the current International Geomagnetic Reference Field (IGRF). While results are typically accurate to 30 minutes of arc, users should be aware that solar storms can cause intense, short-term disturbances in the magnetic field.

If you are unsure about your city's latitude and longitude, look it up online! In the USA try entering your zip code in the box below or visit the U.S. Gazetteer. Outside the USA try the Getty Thesaurus.

Search for a place in the USA by Zip Code:

Enter Bounding Coordinates: (latitude 90S to 90N, longitude 180W to 180E). For decimal degrees, enter the number as is (i.e. 45.508). For degrees, minutes, seconds enter space separated fields (i.e. 45 30 29).
N S
E W E W    Step size:
N S
Step size:


Start Date (1900-2015):
  Year: Month (1-12): Day (1-31):


End Date (same as starting date for a single day) (1900-2015):
  Year: Month (1-12): Day (1-31):


For multiple years, enter step size in years:

Elevation (0-600 km):

Magnetic component: D(eclination)   I(nclination)   X   Y   Z   H(orizontal Intensity)   F (Total Intensity)

View results in Grid / List format.


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Answers to some frequently asked questions | Instructions for use | Today's Space Weather