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Magnetic declination calculator

Magnetic declination calculator

In the form below there are three groups of fields. Each group has several fields followed by a help icon. When the help icon is selected, it will insert information about the group below the group of fields.

Date:
The range of dates is determined by using the International Geomagnetic Reference Field (IGRF). IGRF-2010 is valid between years 1900 and 2015. An updated model is expected to be implemented by January 2015.
Latitude:
degrees, minutes, ( )
When entering latitude use one of the following two conventions:
  • Decimal degrees to a maximum of three decimal places, e.g., 45.738; leave the minutes box blank. Choose North or South, East or West from the 'radio' buttons.
  • Degrees and minutes; enter degrees in the first box; enter minutes to a maximum of one decimal place in the second box; e.g. 45 54.3. Choose North or South, East or West from the 'radio' buttons.
For more information, please visit the Tips for using calculators page.
Longitude:
degrees, minutes, ( )
When entering longitude use one of the following two conventions:
  • Decimal degrees to a maximum of three decimal places, e.g., 45.738; leave the minutes box blank. Choose North or South, East or West from the 'radio' buttons.
  • Degrees and minutes; enter degrees in the first box; enter minutes to a maximum of one decimal place in the second box; e.g. 45 54.3. Choose North or South, East or West from the 'radio' buttons.
For more information, please visit the Tips for using calculators page.

Tips and more information about this calculator.

Learn how to use the magnetic declination with a compass.

Other components of the magnetic field may be calculated using the magnetic field calculator.

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Date Modified:
2012-01-10