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Background

Brief description of geomagnetism and observation systems

About WMM

Learn more about model derivation, uncertainties and magnetic poles

Model & Software

Download model coefficients, software and documentation

Online Calculators

Calculate magnetic field values at or near the Earth surface

Maps

Browse imagery and contour maps for main field and secular change

Uses of WMM

Common applications of WMM

License

License and copyright information

Online Calculators for the World Magnetic Model

Single Point Calculator

DoD World Magnetic Model Single Point Calculator (2015 - 2020)
This web-calculator will produce output for a single point for a range of dates. Select the WMM2015 radio button to get results from the World Magnetic Model.

Input And Output

The input parameters and valid entries are:

Latitude -90.00 to +90.00 degrees
Longitude -180.00 to +180.00 degrees
Altitude referenced to the WGS 84 ellipsoid
Date January 1, 2015 to December 31, 2019.

The seven magnetic components computed are:

F - Total Intensity of the geomagnetic field
H - Horizontal Intensity of the geomagnetic field
X - North Component of the geomagnetic field
Y - East Component of the geomagnetic field
Z - Vertical Component of the geomagnetic field
I (DIP) - Geomagnetic Inclination
D (DEC) - Geomagnetic Declination (Magnetic Variation)

Annual change in each of these magnetic components is also displayed. The annual change is computed by subtracting the main field values for the desired input date from main field values one year later. The output units are displayed using the abbreviations nT (nanoTesla), deg (degrees) and min (minutes) per year. The new WMM2015 software also outputs uncertainty for each component. The error is one standard deviation difference between a hypothetical measurement and model output. The uncertainty values have the same units as their corresponding components.

Grid Calculator

DoD World Magnetic Model Grid Calculator (2015 - 2020)
This web-calculator will produce output for a grid of points for a range of dates. It outputs as either XML or CSV. Select the WMM radio button to get results from the World Magnetic Model.

Declination Calculator

DoD World Magnetic Model Declination Calculator (2015 - 2020)
This web-calculator will give declination for a single point. If HTML output is selected it includes a google map with sample compass. Select the WMM2015 radio button to get results from the World Magnetic Model.