ECEF to geodetic coordinates
Convert Earth-centred Cartesian X, Y and Z coordinates to latitude, longitude and ellipsoidal height using a selected reference ellipsoid.
Open converter →Geodion tools
Transparent geodetic calculations in your browser.
Practical specialist tools for coordinate work, designed with explicit assumptions, clear outputs and local processing.
View available toolsAvailable tools
Built for practical geodetic workflows
Calculations run locally in the browser. Coordinate data is not uploaded to Geodion.
Geodetic to ECEF coordinates
Convert geodetic latitude, longitude and ellipsoidal height to Earth-centred Cartesian X, Y and Z coordinates.
Open converter →True ↔ grid heading
Convert between geodetic true heading and grid heading using meridian convergence for UTM north or south with selectable ellipsoids, and British National Grid.
Open converter →Geodetic ↔ UTM projection
Project geodetic latitude and longitude to UTM Easting and Northing, or reverse UTM coordinates to geodetic coordinates, with explicit zone, hemisphere and ellipsoid settings.
Open converter →Decimal degrees ↔ DMS
Convert latitude and longitude in either direction between signed decimal degrees and degrees, minutes and seconds with correct hemisphere handling.
Open converter →Geodesic calculations
Distance, forward azimuth and reverse azimuth between positions on a selected ellipsoid.
Explicit parameters
Every result identifies the reference ellipsoid and its defining parameters.
Local processing
Single points and CSV/XLSX files are processed on the visitor’s device, not transmitted to a server.
Professional context
Tools support calculation and checking; they do not replace reference-frame, datum or project-specific assessment.