⚡ FREE · NOAA WMM · GLOBAL
Magnetic Declination Calculator
Get the magnetic declination (variation) for any point on Earth using the NOAA World Magnetic Model — plus inclination, field intensity and annual change. Free, no signup.
Magnetic declination is the angle between magnetic north (where your compass points) and true north (the geographic pole). It varies by location and slowly drifts over time. Surveyors, drone pilots and navigators must know it to convert magnetic bearings to true bearings. This calculator uses the official NOAA/NGA World Magnetic Model.