Magnetic field calculator

Instructions

Date

The range of dates permitted with the International Geomagnetic Reference Field (IGRF-12) ranges from 1900 and 2020.

Latitude and Longitude

When entering the geographic latitude or longitude use one of the following three conventions:

  • Decimal degrees to a maximum of three decimal places, e.g., 45.738. Choose North or South, East or West from the 'radio' buttons.
  • Degrees and minutes, e.g. 45 54.3. Choose North or South, East or West from the 'radio' buttons.
  • Degrees, minutes, and seconds, e.g. 45 54 3.3. Input seconds will be rounded to the nearest second in the output. Choose North or South, East or West from the 'radio' buttons.

This calculator may be used to calculate values of all seven magnetic components (D, I, H, Z, F, X, Y) for a specified location and date based on the International Geomagnetic Reference Field model.

Please contact Geomag-Info for information on the magnetic calculator web service and batch processing.