Magnetic declination calculator


Information: 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 and Longitude

Information: Latitude and Longitude

When entering the latitude or 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.

Latitude (hemisphere)
Longitude (hemisphere)

This calculator may be used to calculate the magnetic declination. The International Geomagnetic Reference Field is used to compute values within Canada and elsewhere in the world.

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.