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ECEF Coordinate Converter

Convert WGS84 latitude, longitude and ellipsoid height to Earth-Centered, Earth-Fixed X, Y and Z metres — or turn ECEF coordinates back into a geodetic position.

Choose which way to convert
Decimal degrees, -90 to 90; N is positive
Decimal degrees, -180 to 180; E is positive
Metres above the WGS84 ellipsoid, not sea level
Enter a geodetic or ECEF position to convert it.

Earth-Centered, Earth-Fixed coordinates place a point on the WGS84 ellipsoid: X runs through the equator and prime meridian, Y through the equator at 90° east, and Z through the north pole, all in metres. A geodetic latitude is measured against the ellipsoid normal, which differs from the geocentric latitude through the same point by up to about 0.19°, so the two are reported separately. Ellipsoid height is measured above the WGS84 ellipsoid, not above mean sea level, and the two can differ by tens of metres. The converter uses the WGS84 semi-major axis 6378137 m and flattening 1/298.257223563. It does not transform between datums such as NAD83, ETRS89 or a local grid, does not apply a geoid model, and is not a substitute for authoritative surveying or navigation data. Everything runs in your browser with no storage, uploads or network access.